U.S. Route 171
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U.S. Highway 171 (US 171) is a part of the
United States Numbered Highway System The United States Numbered Highway System (often called U.S. Routes or U.S. Highways) is an integrated network of roads and highways numbered within a nationwide grid in the contiguous United States. As the designation and numbering of these ...
and the only route within that system currently located entirely within the state of
Louisiana Louisiana ( ; ; ) is a state in the Deep South and South Central regions of the United States. It borders Texas to the west, Arkansas to the north, and Mississippi to the east. Of the 50 U.S. states, it ranks 31st in area and 25 ...
. It spans in a north–south direction from the junction of US 90 and Louisiana Highway 14 (LA 14) in Lake Charles to the junction of US 79/ US 80 and LA 3094 in
Shreveport Shreveport ( ) is a city in the U.S. state of Louisiana. It is the List of municipalities in Louisiana, third-most populous city in Louisiana after New Orleans and Baton Rouge, Louisiana, Baton Rouge. The bulk of Shreveport is in Caddo Parish, Lo ...
. As its designation indicates, US 171 is numbered as a spur of US 71, the principal north–south U.S. Highway through Shreveport, though they technically do not intersect. US 171 traverses six of the seven parishes along the
Texas Texas ( , ; or ) is the most populous U.S. state, state in the South Central United States, South Central region of the United States. It borders Louisiana to the east, Arkansas to the northeast, Oklahoma to the north, New Mexico to the we ...
state line, the only exception being Cameron Parish located on the
Gulf of Mexico The Gulf of Mexico () is an oceanic basin and a marginal sea of the Atlantic Ocean, mostly surrounded by the North American continent. It is bounded on the northeast, north, and northwest by the Gulf Coast of the United States; on the southw ...
south of Lake Charles. The route connects all six
parish seat A county seat is an administrative center, seat of government, or capital city of a county or civil parish. The term is in use in five countries: Canada, China, Hungary, Romania, and the United States. An equivalent term, shire town, is used in ...
s as it travels through the thick pine forests of western Louisiana on a wide four-lane right-of-way. The northern half of the route serves as the only major north–south corridor between
Interstate 49 Interstate 49 (I-49) is a north–south Interstate Highway with multiple segments. The original portion is entirely within Louisiana with an additional signed portion extending from Interstate 220 (Louisiana), I-220 in Shreveport, Louisian ...
(I-49) to the east and the Toledo Bend Reservoir along the state line to the west. Between the metropolitan areas at each terminus, US 171 passes through the smaller cities of DeRidder, Leesville, and
Mansfield Mansfield is a market town and the administrative centre of the Mansfield District in Nottinghamshire, England. It is the largest town in the wider Mansfield Urban Area and the second largest settlement in Nottinghamshire (following the city ...
, as well as the towns of Rosepine, Many,
Zwolle Zwolle () is a List of cities in the Netherlands by province, city and Municipalities of the Netherlands, municipality in the Northeastern Netherlands. It is the Capital city, capital of the Provinces of the Netherlands, province of Overijssel ...
, and Stonewall. Along the way, the highway has interchanges with many of the state's major east–west routes, including
Interstate 10 Interstate 10 (I-10) is the southernmost transcontinental highway in the Interstate Highway System of the United States. It is the fourth-longest Interstate in the country at , following I-90, I-80, and I-40. It was part of the origina ...
(I-10), US 190, LA 28, US 84, and
I-20 I20, I 20 or I-20 may refer to: * Interstate 20, a highway in the southeastern United States * I-20 (form), a United States government document that provides supporting information for the issuance of a student visa or change of status * I-20 (rap ...
. US 171 was created as one of the original routes of the numbered U.S. Highway system in November 1926. Its only major alignment change occurred in 1937, when the highway was shifted from what is now LA 175 between Many and Mansfield. Improvements over the years have included the paving of the entire route during the early 1930s, the elimination of many at-grade railroad crossings during the remainder of the decade, and the widening of the highway to four lanes through its urban areas during the 1960s and 1970s. Four-laning of the entire route was accomplished between 1990 and 2010 via the state's massive TIMED program with the goal of improving safety and promoting economic development along the corridor. The route carries several honorary designations, primarily that of the Purple Heart Highway in tribute to all recipients of the
Purple Heart The Purple Heart (PH) is a United States military decoration awarded in the name of the president to those wounded or killed while serving, on or after 5 April 1917, with the U.S. military. With its forerunner, the Badge of Military Merit, ...
military decoration. The route has long been associated with the U.S. Armed Forces due to its proximity to at least four military bases active during the World Wars, the lone survivor of which is
Fort Johnson Fort Polk, formerly Fort Johnson, is a United States Army installation located in Vernon Parish, Louisiana, Vernon Parish, Louisiana, about 10 miles (15 km) east of Leesville, Louisiana, Leesville and 30 miles (50 km) north of DeRid ...
near Leesville.


Route description


Lake Charles to Leesville

From the south, US 171 begins at a junction with US 90 (Fruge Street) and LA 14 (South Martin Luther King Highway), in Lake Charles, the largest city in Calcasieu Parish and southwestern Louisiana. Traveling about east of the downtown area, US 171 continues the route of LA 14 northward along North Martin Luther King Highway, initially as a divided four-lane highway. After immediately crossing over the
BNSF BNSF Railway is the largest freight railroad in the United States. One of six North American Class I railroads, BNSF has 36,000 employees, of track in 28 states, and over 8,000 locomotives. It has three transcontinental routes that provide ...
and
Union Pacific The Union Pacific Railroad is a Class I freight-hauling railroad that operates 8,300 locomotives over routes in 23 U.S. states west of Chicago and New Orleans. Union Pacific is the second largest railroad in the United States after BNSF, ...
(UP) railroad lines, N. Martin Luther King passes through a partial
cloverleaf interchange A cloverleaf interchange is a two-level interchange (road), interchange in which all turns are handled by slip roads. To go left (in right-hand traffic; reverse directions in left-driving regions), vehicles first continue as one road passe ...
with I-10 at exit 33, connecting with
Beaumont, Texas Beaumont is a city in the U.S. state of Texas. It is the county seat of Jefferson County, Texas, Jefferson County, within the Beaumont–Port Arthur metropolitan area, located in Southeast Texas on the Neches River about east of Houston (city ...
to the west and Lafayette to the east. The highway gains a center turning lane and an additional northbound travel lane throughout the commercial corridor north of the interstate. Upon exiting Lake Charles, US 171 traverses a strip of wetlands with twin-span bridges over two navigable waterways, English Bayou and the
Calcasieu River The Calcasieu River ( ; ) is a river on the Gulf Coast of the United States, Gulf Coast in southwestern Louisiana. Approximately long,U.S. Geological Survey. National Hydrography Dataset high-resolution flowline dataThe National Map, accessed J ...
. After crossing the latter, the roadway remains elevated until reaching the unincorporated suburb of Moss Bluff. A junction here with LA 378 (Sam Houston Jones Parkway) leads west to Sam Houston Jones State Park and the nearby city of Westlake. US 171 maintains a combination of single and double center lanes through Moss Bluff, dropping the N. Martin Luther King Hwy signage as it passes just north of central Moses Bluff. As the surroundings become less developed, the right-of-way widens to accommodate a broad, grassy median. North of Moss Bluff, a rural area known as Gillis introduces a mixture of open farmland, thick forest, and scattered residential development that characterizes the next to the city of DeRidder. During this stretch, US 171 enters
Beauregard Parish Beauregard Parish () is a parish located in the U.S. state of Louisiana. As of the 2020 census, the population was 36,549. The parish seat and most populous municipality is DeRidder. The parish was formed on January 1, 1913. Beauregard Paris ...
and engages in a
folded diamond interchange A partial cloverleaf interchange or parclo is a modification of a cloverleaf interchange. The design has been well received, and has since become one of the most popular freeway-to-arterial interchange designs in North America. It has also bee ...
with US 190 and LA 12 that allows a grade separation with the Union Pacific Railroad line. Located in
Ragley Ragley Hall in the parish of Arrow, Warwickshire, Arrow in Warwickshire is a stately home, located south of Alcester and west of Stratford-upon-Avon. It is the ancestral seat of the Seymour-Conway family, Marquess of Hertford, Marquesses of H ...
, the landscaped eastern side of the interchange doubles as a recreational area known as Purple Heart Memorial Park, echoing the official designation of US 171 as the Purple Heart Highway. US 171 proceeds due north from Ragley co-signed with US 190 through the community of Longville, located at the eastern terminus of LA 110, and enters the outskirts of DeRidder. Approaching the city limits, US 171 and US 190 pass the western termini of three rural state highways. The first, LA 394 leads to a recreational area on Bundick Lake. The others, LA 26 and LA 112, connect to
Oberlin Oberlin may refer to: ; Places in the United States * Oberlin Township, Decatur County, Kansas ** Oberlin, Kansas, a city in the township * Oberlin, Louisiana, a town * Oberlin, Ohio, a city * Oberlin, Licking County, Ohio, a ghost town * Oberlin, ...
and Oakdale in neighboring
Allen Parish Allen Parish () is a parish located in the U.S. state of Louisiana. As of the 2020 census, the population was 22,750. The parish seat is Oberlin and the largest city is Oakdale. Allen Parish is in southwestern Louisiana, southwest of Alexan ...
. Curving west into the
parish seat A county seat is an administrative center, seat of government, or capital city of a county or civil parish. The term is in use in five countries: Canada, China, Hungary, Romania, and the United States. An equivalent term, shire town, is used in ...
, US 171 serves as DeRidder's main east–west commercial thoroughfare. Initially traveling along 1st Street with a center turning lane, the route divides into a
one-way pair A one-way pair, one-way couple, or couplet refers to that portion of a bi-directional traffic facilitysuch as a road, bus, streetcar, or light rail linewhere its opposing flows exist as two independent and roughly parallel facilities. Descriptio ...
as westbound traffic transitions onto Mahlon Street. The highway then crosses the
Kansas City Southern Railway The Kansas City Southern Railway Company is an American Class I railroad. Founded in 1887, it operated in 10 Midwestern United States, Midwestern and Southeastern United States, Southeastern U.S. states: Illinois, Missouri, Kansas, Oklahoma, Ark ...
(KCS) line into the downtown area, where it passes several historic buildings over the next few blocks. These include the Beauregard Parish Courthouse and an infamous Gothic structure known as the Hanging jail. US 171 ends its concurrency with US 190 by turning north onto Pine Street, an undivided four-lane thoroughfare. From this intersection, LA 27 heads south on Pine Street toward DeQuincy while US 190 continues west on the one-way pair of 1st and Shirley Streets toward Merryville. US 171 remains a commercial corridor until it crosses the Vernon Parish line, reverting to its rural configuration as it closely parallels the KCS rail line. DeRidder is separated by the small town of Rosepine by a short distance, during which an intersection with LA 3226 allows southbound traffic to bypass the city en route to US 190 west. At a point known as Pickering, located north of Rosepine, US 171 intersects LA 10, the first of several connections to the
United States Army The United States Army (USA) is the primary Land warfare, land service branch of the United States Department of Defense. It is designated as the Army of the United States in the United States Constitution.Article II, section 2, clause 1 of th ...
installation at
Fort Johnson Fort Polk, formerly Fort Johnson, is a United States Army installation located in Vernon Parish, Louisiana, Vernon Parish, Louisiana, about 10 miles (15 km) east of Leesville, Louisiana, Leesville and 30 miles (50 km) north of DeRid ...
. Passing to the west of the base, the highway continues through New Llano and into the larger adjacent city of Leesville.


Leesville to Mansfield

In Leesville, US 171 becomes a busy commercial corridor again, initially traveling along 5th Street's narrow four-lane right-of-way. Another one-way pair is then utilized as the parallel 6th Street begins to carry southbound traffic. In the center of town, three state highway junctions are encountered in the space of a few blocks: LA 467 (University Parkway) to
Northwestern State University Northwestern State University of Louisiana (NSULA) is a public university primarily situated in Natchitoches, Louisiana, with a nursing campus in Shreveport, Louisiana, Shreveport and general campuses in Leesville, Louisiana, Leesville/Fort Jo ...
's Fort Johnson campus; LA 468 (Lula Street) to the historic business district; and westbound LA 8 (Nolan Trace Parkway) toward
Jasper, Texas Jasper is a Administrative divisions of Texas, city in and the county seat of Jasper County, Texas, Jasper County, Texas, United States. Its population was 6,884 at the 2020 United States census, 2020 U.S. Census, down from 7,590 at the 2010 Un ...
. US 171 proceeds north concurrent with LA 8 and descends below grade to cross under the KCS railroad line. Curving to the northwest, the highway's travel lanes converge as it approaches a
roundabout A roundabout, a rotary and a traffic circle are types of circular intersection or junction in which road traffic is permitted to flow in one direction around a central island, and priority is typically given to traffic already in the junct ...
. Here, at the northern end of town, LA 8 departs to the east and travels concurrently with LA 28 toward
Alexandria Alexandria ( ; ) is the List of cities and towns in Egypt#Largest cities, second largest city in Egypt and the List of coastal settlements of the Mediterranean Sea, largest city on the Mediterranean coast. It lies at the western edge of the Nile ...
, the principal city of central Louisiana. During its remaining in Vernon Parish, US 171 crosses the northeastern tip of
Vernon Lake Vernon Lake is a man-made lake in Vernon Parish, Louisiana. In 1963, Vernon Lake was created by the impounding of Anacoco Creek (Anacoco Bayou), creating a lake for the purpose of water supply and recreation. The lake is west of Leesville, and ...
and passes through the rural towns of Anacoco and Hornbeck. Junctions there with LA 111 and LA 392, respectively, lead to points along the vast Toledo Bend Reservoir located on the Texas state line. US 171 enters
Sabine Parish Sabine Parish ( French: ''Paroisse de la Sabine'') is a parish located in the U.S. state of Louisiana. As of the 2020 census, the population was 22,155. The parish seat and largest town is Many. Sabine was one of five parishes created in as ...
winding gently through the rural hilly woodlands while passing the entrance to Hodges Gardens State Park, the largest horticultural park in the United States. The route proceeds through the village of
Florien Florien is a village in Sabine Parish, Louisiana, United States. The population was 633 at the 2010 United States Census, 2010 census, down from 692 at the 2000 United States Census, 2000 census. The village is home to the annual Sabine Free Stat ...
, where a
Boise Cascade Boise Cascade Company is an American manufacturer of wood products and wholesale distributor of building materials, headquartered in Boise, Idaho. with sales over $7.9 billion in 2021, it is traded on the New York Stock Exchange (NYSE) under th ...
lumber plant is located, and into
Fisher Fisher is an archaic term for a fisherman, revived as gender-neutral. Fisher, Fishers or The Fisher may also refer to: Places Australia * Division of Fisher, an electoral district in the Australian House of Representatives, in Queensland *Elec ...
, its smaller neighbor. US 171 then curves northwest and enters the town of Many, the parish seat. Cutting a serpentine path through the street grid outside the downtown area, the highway crosses LA 6 (San Antonio Avenue), which follows a section of the historic
Old San Antonio Road The Old San Antonio Road was a historic roadway located in the U.S. states of Texas and Louisiana. Parts of it were based on traditional Native American trails. Its Texas terminus was about southeast of Eagle Pass, Texas, Eagle Pass at the Rio ...
(or El Camino Real) between
San Antonio, Texas San Antonio ( ; Spanish for "Anthony of Padua, Saint Anthony") is a city in the U.S. state of Texas and the most populous city in Greater San Antonio. San Antonio is the List of Texas metropolitan areas, third-largest metropolitan area in Texa ...
and
Natchitoches, Louisiana Natchitoches ( ; , ), officially the City of Natchitoches, is a small city in, and the parish seat of, Natchitoches Parish, Louisiana, Natchitoches Parish, Louisiana, United States. At the 2020 United States census, the city's population was ...
. Regaining its wide rural right-of-way, US 171 intersects the southern terminus of LA 175, leading to Belmont and Pleasant Hill. US 171 makes a bee-line to the northwest over the between Many and
Zwolle Zwolle () is a List of cities in the Netherlands by province, city and Municipalities of the Netherlands, municipality in the Northeastern Netherlands. It is the Capital city, capital of the Provinces of the Netherlands, province of Overijssel ...
. Served by the highway's only business route, Zwolle is bypassed by mainline US 171, which travels around its east and north sides, intersecting LA 120 in the process. Signage also directs motorists onto US 171 Bus. to access North Toledo Bend State Park. US 171 comes closest to reaching the Toledo Bend Reservoir at Zwolle and the neighboring village of
Noble A noble is a member of the nobility. Noble may also refer to: Places Antarctica * Noble Glacier, King George Island * Noble Nunatak, Marie Byrd Land * Noble Peak, Wiencke Island * Noble Rocks, Graham Land Australia * Noble Island, Gr ...
. After crossing over the KCS Railway at Noble, US 171 curves back to the north and intersects LA 174 in the village of
Converse Converse may refer to: Mathematics and logic * Converse (logic), the result of reversing the two parts of a definite or implicational statement ** Converse implication, the converse of a material implication ** Converse nonimplication, a logical c ...
. Closely following the rail line once again, US 171 crosses into
DeSoto Parish DeSoto Parish (; French: ''Paroisse DeSoto'') is a parish located in the U.S. state of Louisiana. The parish was formed in 1843. At the 2020 U.S. census, the population was 26,812. Its parish seat and most populous municipality is Mansfield. D ...
just south of Benson, a point located at an intersection with LA 512. later, the highway makes an S-curve across the KCS line on a high twin-span overpass before proceeding due north into South Mansfield, a small village connected to the city of
Mansfield Mansfield is a market town and the administrative centre of the Mansfield District in Nottinghamshire, England. It is the largest town in the wider Mansfield Urban Area and the second largest settlement in Nottinghamshire (following the city ...
, the parish seat. In Mansfield proper, US 171 follows Jenkins Street and intersects US 84 at Washington Avenue, connecting with Logansport to the west. US 84 overlaps US 171 for a short distance until reaching Polk Street, while the bypassed original mainline route follows the continuation of Washington Avenue signed as US 84 Bus. At Polk Street, signage points motorists onto eastbound US 84 toward the
Mansfield State Historic Site The Mansfield State Historic Site, also known as the Mansfield Battlefield, is a battlefield in DeSoto Parish, Louisiana. The Louisiana state historic site commemorates the Battle of Mansfield fought on Friday, April 8, 1864, during the Red ...
, a
Civil War A civil war is a war between organized groups within the same Sovereign state, state (or country). The aim of one side may be to take control of the country or a region, to achieve independence for a region, or to change government policies.J ...
battlefield, as well as the former Mansfield Female College, the first institution of higher learning for women west of the
Mississippi River The Mississippi River is the main stem, primary river of the largest drainage basin in the United States. It is the second-longest river in the United States, behind only the Missouri River, Missouri. From its traditional source of Lake Ita ...
. US 84 also leads eastward to an interchange with
I-49 Interstate 49 (I-49) is a north–south Interstate Highway with multiple segments. The original portion is entirely within Louisiana with an additional signed portion extending from I-220 in Shreveport to the Arkansas state line, three ne ...
.


Shreveport metropolitan area

As it enters the Shreveport metropolitan area, US 171 begins to approach and eventually parallel the route of I-49, the state's major north–south highway. After curving northwest out of Mansfield, US 171 passes the DeSoto Parish Airport and heads through Grand Cane, located at a junction with LA 3015. later, the highway bends due north again and then crosses LA 5 at a junction in Gloster known as
Kickapoo The Kickapoo people (; Kickapoo: Kiikaapoa or Kiikaapoi; ) are an Algonquian-speaking Native American tribe and Indigenous people in Mexico, originating in the region south of the Great Lakes. There are three federally recognized Kickapoo trib ...
. Just before crossing into
Caddo Parish Caddo Parish () () is a parish located in the northwestern corner of the U.S. state of Louisiana. According to the 2020 U.S. census, the parish had a population of 237,848. The parish seat and largest city is Shreveport, which developed al ...
, US 171 passes through the town of Stonewall and intersects LA 3276, a connector to I-49. Across the parish line, US 171 crosses underneath the Union Pacific Railroad tracks in the unincorporated community of Keithville. Residential development gradually increases as the highway parallels the UPRR line toward the
Shreveport Shreveport ( ) is a city in the U.S. state of Louisiana. It is the List of municipalities in Louisiana, third-most populous city in Louisiana after New Orleans and Baton Rouge, Louisiana, Baton Rouge. The bulk of Shreveport is in Caddo Parish, Lo ...
city limits. US 171 enters Shreveport on Mansfield Road and retains its wide median as it becomes a heavily traveled commercial corridor once again. The highway has junctions with LA 525 (Colquitt Road), as well as LA 526, a major thoroughfare along the south side of town called the Bert Kouns Industrial Loop Expressway. Larger shopping developments line the roadway as US 171 approaches an interchange with LA 3132 (Terry Bradshaw Passway), a freeway loop commonly known as the Inner Loop Expressway. LA 3132 complements the
I-220 Interstate 220 (I-220) is the designation for two Interstate Highways in the United States, both related to Interstate 20: * Interstate 220 (Mississippi), a bypass of Jackson, Mississippi *Interstate 220 (Louisiana) Interstate 220 (I-220) ...
northern bypass of Shreveport and connects to major interchanges with
I-20 I20, I 20 or I-20 may refer to: * Interstate 20, a highway in the southeastern United States * I-20 (form), a United States government document that provides supporting information for the issuance of a student visa or change of status * I-20 (rap ...
to the northwest and I-49 to the east. Some movements between US 171 and LA 3132 are accomplished through a connected interchange with Jewella Avenue, a divided thoroughfare that branches off of Mansfield Road. Proceeding northward, US 171 crosses over the UPRR line for the final time and intersects LA 511 (West 70th Street). The highway immediately branches off of Mansfield Road itself, transferring onto Hearne Avenue. Its median now replaced by a center turning lane, US 171 travels through a primarily residential neighborhood until passing through a
diamond interchange A diamond interchange is a common type of road junction, used where a controlled-access highway crosses a minor road. Design The freeway itself is grade separation, grade-separated from the minor road, one crossing the other over a bridge. ...
with I-20 at exit 16A. This interchange is located at the edge of the State Fair Grounds, an area which also houses the Louisiana State Exhibit Museum and three sports facilities—
Independence Stadium Independence Stadium may also refer to: * Independence Stadium (Bakau) in Gambia * Independence Stadium (Namibia) in Windhoek * Independence Stadium (South Africa) in Mthatha, a List of football stadiums in South Africa, football stadium in South A ...
, the
Hirsch Memorial Coliseum Hirsch Memorial Coliseum is 10,000-seat multi-purpose arena in Shreveport, Louisiana, designed by the late local architect Edward F. Neild Jr. (1908–1958) who, with his father in 1937, had designed the Louisiana State Exhibit Museum in Shrevepo ...
, and a baseball stadium. US 171 reaches its northern terminus a short distance beyond I-20 at a junction with the concurrent US 79/ US 80 (Greenwood Road). Hearne Avenue continues straight ahead as LA 3094 toward a junction with northbound US 71/ LA 1 just outside Downtown Shreveport.


Route classification and data

US 171 carries at least four lanes of traffic for its entire length. It alternates between a rural and urban principal arterial over the course of its route, as determined by the
Louisiana Department of Transportation and Development The Louisiana Department of Transportation and Development (DOTD) is a Federated state, state government organization in the United States, in charge of maintaining public transportation, roadways, bridges, canals, select levees, floodplain mana ...
(La DOTD). Daily traffic volume in 2013 peaked at 37,700 vehicles in Shreveport and 29,800 in Lake Charles. The lowest figure reported was 2,200 vehicles north of Hornbeck in southern Sabine Parish. The posted speed limit ranges from throughout most divided rural stretches to as low as within some corporate limits. Since 2003, virtually the entire route of US 171 has been officially designated as the Purple Heart Highway in recognition of all
Purple Heart The Purple Heart (PH) is a United States military decoration awarded in the name of the president to those wounded or killed while serving, on or after 5 April 1917, with the U.S. military. With its forerunner, the Badge of Military Merit, ...
recipients. The only exceptions are the portion from its southern starting point in Lake Charles to central Moses Bluff, named in 1982 for
Martin Luther King Jr. Martin Luther King Jr. (born Michael King Jr.; January 15, 1929 – April 4, 1968) was an American Baptist minister, civil and political rights, civil rights activist and political philosopher who was a leader of the civil rights move ...
, and another in Rosepine named for its former mayor Johnnie B. Hall in 1997. Decades earlier, two markers were installed on US 171 identifying it as a
Blue Star Memorial Highway Blue Star Memorial Highways are highways in the United States that are marked to pay tribute to the U.S. armed forces. The National Council of State Garden Clubs, now known as National Garden Clubs, National Garden Clubs, Inc., started the progra ...
as "a tribute to the
Armed Forces A military, also known collectively as armed forces, is a heavily armed, highly organized force primarily intended for warfare. Militaries are typically authorized and maintained by a sovereign state, with their members identifiable by a ...
that have defended the United States of America." The first was dedicated on March 17, 1957 at the roadside park in Ragley. The second was dedicated on November 11, 1964 at the intersection with Washington Street in DeRidder. Additionally, a stretch of US 171, extending from LA 26 south of DeRidder to LA 10 south of Leesville, serves as part of the Myths and Legends Byway in the state-designated system of tourist routes known as the Louisiana Scenic Byways.


History


Original route and early improvements

US 171 was designated in November 1926 as one of the original routes of the numbered U.S. Highway system. The majority of the route, extending from Lake Charles to Many, has remained largely unchanged to the present day. North of Many, however, US 171 was initially routed along the current LA 175 to Mansfield, where it rejoined the modern alignment into Shreveport. The entire route was also initially co-signed with Louisiana's corresponding state highway designations as created in 1921. These consisted of State Route 42 from Lake Charles to Many, State Route 51 from Many to Belmont, and State Route 1 from Belmont to Shreveport. This practice was discontinued when the state highway system was renumbered in 1955. Upon its designation in 1926, US 171 was generally a gravel road outside the city of Shreveport. By the summer of 1932, however, the entire highway was paved with two lanes of concrete aside from the Many–Mansfield section. Instead, the modern alignment via Zwolle, which was also the northern portion of Route 42 prior to 1955, was being straightened and paved to serve as US 171. The revised route also received two grade separations with the Kansas City Southern Railway line that were constructed in 1934. These consisted of an overpass at Noble and an underpass at Trenton, about south of Mansfield. Completed at the end of 1937, this would be the only major alignment change in the highway's history and the only instance in which the paved alignment significantly differed from the established gravel road. Minor deviations, mostly near the highway's southern end, included a diagonal cutoff that bypassed a
section line road In many jurisdictions in the United States, roads run along every section line, giving access to previously remote areas and serving in many instances as firebreaks. A road or arterial in which the centerline is laid out along a section line bounda ...
zigzag running northwest from Gillis and the straightening of the route through Longville. During the mid- to late 1930s, six additional grade separations were constructed elsewhere along US 171, eliminating nearly every railroad crossing along the route. The first was an overpass of the now abandoned
Gulf, Colorado and Santa Fe Railway The Gulf, Colorado and Santa Fe Railway (GC&SF) was chartered in Texas in 1873 to build a railroad from Galveston, Texas, to Santa Fe, New Mexico. By 1886, it had built from Galveston to a junction in Temple, Texas, which was founded by the co ...
just east of DeRidder in 1934. The others were constructed beginning in 1935 as part of a federally funded grade separation program. That year, $3.2 million was allocated for this purpose by a
Works Progress Administration The Works Progress Administration (WPA; from 1935 to 1939, then known as the Work Projects Administration from 1939 to 1943) was an American New Deal agency that employed millions of jobseekers (mostly men who were not formally educated) to car ...
program and was earmarked by the
Louisiana Highway Commission The Louisiana Department of Transportation and Development (DOTD) is a state government organization in the United States, in charge of maintaining public transportation, roadways, bridges, canals, select levees, floodplain management, port faci ...
for 28 separate projects. Those projects along US 171 consisted of overpasses of the Southern Pacific Lines at Lake Charles, the
Gulf Coast Lines The Gulf Coast Lines was the name of a railroad system comprising three principal railroads, as well as some smaller ones, that stretched from New Orleans, Louisiana, via Baton Rouge and Houston to Brownsville, Texas. Originally chartered as sub ...
at Ragley, and the
Texas and Pacific Railway The Texas and Pacific Railway Company (known as the T&P) was created by federal charter in 1871 with the purpose of building a southern transcontinental railroad between Marshall, Texas, and San Diego, California. However its lines never went we ...
at both Grand Cane and Shreveport, as well as an underpass of the Kansas City Southern at Leesville. The overpasses were all completed in 1937, with the Leesville underpass following in 1939. All have since been replaced or supplemented with newer four-lane crossings, except the DeRidder and Grand Cane structures, which have been eliminated due to abandonment of the railroad lines.


Urban improvements and initial widening projects

The next burst of activity in improving US 171 occurred in Caddo Parish, where the entirety of Mansfield Road from the DeSoto Parish line to LA 511 in Shreveport was reconstructed and straightened beginning in 1951. Several sections of the original roadway still exist as local roads, now re-named as Old Mansfield Road, that weave in and out of the current alignment. Additionally, the portion from Southland Park Drive to Jewella Avenue now serves as a frontage road to the modern route. The project was completed in 1954 at a cost of $1,921,000. The new alignment also included an underpass of the
Texas and New Orleans Railroad The Texas and New Orleans Railroad (TNO) was an American rail company in Texas and Louisiana. It operated of railroad in 1934; by 1961, remained when it merged with parent company Southern Pacific Railroad, Southern Pacific. Morgan's Louisian ...
line at Keithville, replacing the grade crossing there. In 1959, the final alignment change in Shreveport had US 171 transition from Mansfield Road onto Hearne Avenue to reach its northern terminus, giving the highway its first section of four-lane pavement. Around 1965, two additional lanes were built on Mansfield Road extending south to LA 526. This was roughly concurrent with the opening of the I-20 interchange on Hearne Avenue, connecting US 171 with the new expressway through Downtown Shreveport and improving access to the US 80 corridor east of the city. The highway was then widened southward through the Keithville area in 1967, making US 171 four lanes throughout both the city of Shreveport and Caddo Parish. The opposite end of US 171 received its first section of four-lane pavement in the early 1960s when the roadway was widened in Lake Charles between the southern terminus at US 90 (Broad Street) and Fruge Street. However, these few blocks of US 171 soon became part of LA 14. The opening of I-10 through Downtown Lake Charles in April 1963 resulted in the re-routing of US 90 onto Fruge Street, and the southern terminus of US 171 was shifted accordingly. The I-10 interchange on US 171 was partially opened to traffic at this time. Its full opening would occur in February 1964 when the interstate was completed eastward to US 165 at
Iowa Iowa ( ) is a U.S. state, state in the upper Midwestern United States, Midwestern region of the United States. It borders the Mississippi River to the east and the Missouri River and Big Sioux River to the west; Wisconsin to the northeast, Ill ...
. In the mid-1960s, four-lane sections of US 171 were also opened to facilitate traffic through two smaller cities. In Mansfield, Washington Avenue was widened and extended southwest, improving the routes of both US 84 and US 171 through town and eliminating two right-angle turns. In DeRidder, a one-way pair was used after Mahlon Street was improved and extended eastward, taking northbound US 171 (and westbound US 190) traffic off of parallel 1st Street. Two further improvements during the 1960s involved new bridges along the route. The first was a replacement of the Anacoco Creek bridge in 1967 with a higher span. This was necessitated by an impoundment of the creek four years earlier that created the recreational Vernon Lake. A more substantial project completed in 1969 overhauled the two most significant water crossings on US 171, the English Bayou and Calcasieu River bridges between Lake Charles and Moss Bluff. The original narrow two-lane spans dating from the 1920s were replaced with four-lane spans on a new four-lane alignment further west. (Though the bridges were demolished in 1973, the land portions of the route still exist as Old US 171, partially as local roads leading to public boat launches and partially on private property.) In 1972, the remaining gap in the four-lane alignment in Lake Charles between Fruge Street and the new bridge approach was widened. Central to this project was the twinning of the railroad overpass south of I-10.


Completing the four-lane highway

Since the 1970s, construction projects on US 171 have mainly focused on completing the highway to four-lane capacity throughout its entire length. This was cited by commercial and political interests as crucial for the economic development of the corridor and a necessary step in preventing the loss of economic opportunities to the US 59 corridor in
East Texas East Texas is a broadly defined cultural, geographic, and ecological region in the eastern part of the U.S. state of Texas that consists of approximately 38 counties. It is roughly divided into Northeast Texas, Northeast, Southeast Texas, Sout ...
. Leesville was the last urban area through which the highway was widened, despite the Army personnel at Fort Johnson having pushed the
Louisiana Department of Highways The Louisiana Department of Transportation and Development (DOTD) is a state government organization in the United States, in charge of maintaining public transportation, roadways, bridges, canals, select levees, floodplain management, port faci ...
for this improvement over several decades. Four-lane segments through the Leesville area were completed approximately as follows: through New Llano and north toward LA 467 in 1975, south from New Llano toward Pickering in 1978, further south to DeRidder in 1981, and finally northward through the city of Leesville in 1982. This last segment involved the creation of a one-way pair using an improved 6th Street to carry southbound traffic and the construction of a parallel railroad underpass. US 171 was further widened northward from Leesville to Anacoco in 1986. Meanwhile in Shreveport, the highway was widened southward from the Caddo–DeSoto parish line through Stonewall in 1981, joining with the four lanes extending from there to LA 5 in Gloster constructed in the late 1970s. The final highway interchange on US 171 was opened between 1981 and 1983 when the Inner Loop Expressway (LA 3132) was completed through the area. The above projects left two long segments of two-lane pavement remaining on US 171, extending from Moss Bluff to DeRidder and from Anacoco to Gloster. The widening of these mostly rural stretches was eventually accomplished as a major component of the Transportation Infrastructure Model for Economic Development program. Approved by the
Louisiana Legislature The Louisiana State Legislature (; ) is the state legislature (United States), state legislature of the U.S. state of Louisiana. It is a bicameral legislature, body, comprising the lower house, the Louisiana House of Representatives with 105 ...
in 1989 and declared as the "single largest transportation program in state history," the TIMED program was initially funded from a 4¢ per gallon gasoline tax which allowed an estimated completion date around 2031. After falling far behind schedule by the late 1990s, the legislature approved the first of several bond measures to fast-track the program. The widening of US 171 was divided into 23 projects totaling approximately and carried out between 1990 and 2010. As before, the four-lane alignment mostly followed the established two-lane with minor deviations to straighten various curves in the roadbed. This is most evident between Mansfield and Grand Cane, where the entire route was reconstructed and straightened. However, more significant changes were carried out in a few locations. A new route through Many bypassed the downtown area, discontinuing the concurrency with LA 6. The neighboring town of Zwolle was bypassed altogether with a new alignment constructed around its northeast side. In this case, the old route through town was retained as US 171 Bus., which was designated in 2008. The route through Mansfield was also streamlined via the widening and extension of Jenkins Street, which benefitted the concurrent US 84 as well. Here, the original four-lane section of Washington Avenue was retained as US 84 Bus. These improvements eliminated all but one right-angle turn along the entirety of US 171, located in the center of DeRidder. Finally, the two-lane railroad underpass at Trenton was replaced by a twin-span overpass located about to the south. The old crossing remains in service as a local road called Old US 171 or Trenton Road. After a total expenditure of $650 million, US 171 was completed as a four-lane highway when a section between Florien and Many was opened to traffic in July 2010. The latest improvement to US 171 involved the installation of a roundabout at the northern end of Leesville. It was the first roundabout to be constructed in the seven parishes forming the state highway department's District No. 8. Located at the junction with eastbound LA 8/LA 28, the junction was previously a signalized T-intersection that was the site of numerous accidents and frequent traffic pileups. Construction began in October 2010, and the project was completed with a ribbon-cutting by Governor
Bobby Jindal Piyush "Bobby" Jindal (born June 10, 1971) is an American politician who served as the 55th governor of Louisiana from 2008 to 2016. A member of the Republican Party, Jindal previously served as a U.S. representative from Louisiana from 2005 t ...
on August 5, 2011 after an expenditure of $2.1 million.


Major intersections


Business route

U.S. Highway 171 Business (US 171 Bus.) runs in a general north–south direction through
Zwolle Zwolle () is a List of cities in the Netherlands by province, city and Municipalities of the Netherlands, municipality in the Northeastern Netherlands. It is the Capital city, capital of the Provinces of the Netherlands, province of Overijssel ...
, a town in
Sabine Parish Sabine Parish ( French: ''Paroisse de la Sabine'') is a parish located in the U.S. state of Louisiana. As of the 2020 census, the population was 22,155. The parish seat and largest town is Many. Sabine was one of five parishes created in as ...
. It follows the original two-lane route of US 171 before the completion of a four-lane bypass in 2008. From the southeast, US 171 Bus. begins at a junction with mainline US 171 just east of the Zwolle corporate limits. The route heads west into town on North Main Street alongside the
Kansas City Southern Railway The Kansas City Southern Railway Company is an American Class I railroad. Founded in 1887, it operated in 10 Midwestern United States, Midwestern and Southeastern United States, Southeastern U.S. states: Illinois, Missouri, Kansas, Oklahoma, Ark ...
(KCS) line. In the center of town, signage directs motorists south on Obrie Street ( LA 475) toward North Toledo Bend State Park. US 171 Bus. turns north onto the same thoroughfare and proceeds out of the downtown area. At an intersection with Willow Street and Old Pleasant Hill Road, the route begins an S-curve that terminates at a second junction with mainline US 171 at the north end of town. US 171 Bus. is classified as a rural principal arterial by the
Louisiana Department of Transportation and Development The Louisiana Department of Transportation and Development (DOTD) is a Federated state, state government organization in the United States, in charge of maintaining public transportation, roadways, bridges, canals, select levees, floodplain mana ...
(La DOTD). The average daily traffic volume in 2013 ranged from 4,200 to 6,000 vehicles. The posted speed limit ranges from through the center of town to near the junctions with mainline US 171 at either end of the route. Major intersections


See also

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Notes


References


External links

*
Maps / GIS Data Homepage
Louisiana Department of Transportation and Development {{DEFAULTSORT:US171 71-1 71-1 1 Transportation in Beauregard Parish, Louisiana Transportation in Caddo Parish, Louisiana Transportation in Calcasieu Parish, Louisiana Transportation in DeSoto Parish, Louisiana Transportation in Sabine Parish, Louisiana Transportation in Vernon Parish, Louisiana