U.S. Route 231 (US 231) is the longest numbered highway in

Indiana Indiana ( ) is a U.S. state, state in the Midwestern United States, Midwestern region of the United States. It borders Lake Michigan to the northwest, Michigan to the north and northeast, Ohio to the east, the Ohio River and Kentucky to the s ...

, covering over . It is a main north–south highway in the western part of the state. The southern terminus of US 231 in Indiana is at the

Kentucky Kentucky (, ), officially the Commonwealth of Kentucky, is a landlocked U.S. state, state in the Southeastern United States, Southeastern region of the United States. It borders Illinois, Indiana, and Ohio to the north, West Virginia to the ...

state line and the northern terminus is at US 41 just south of St. John. The highway is a mixture of expressway and two-lane roadway. The expressway portions exist mainly in southern Indiana and around the Lafayette-

West Lafayette West Lafayette ( ) is a city in Wabash Township, Tippecanoe County, Indiana, Wabash and Tippecanoe Township, Tippecanoe County, Indiana, Tippecanoe Townships, Tippecanoe County, Indiana, United States, approximately northwest of the state capit ...

area, with the rest mainly being two lanes.

Route description

US 231 is maintained by the

Indiana Department of Transportation The Indiana Department of Transportation (INDOT) is a governmental agency of the U.S. state of Indiana charged with maintaining and regulating transportation and transportation related infrastructure such as state owned airports, List of number ...

(INDOT) like all other U.S. Highways in the state. The department tracks the traffic volumes along all state highways as a part of its maintenance responsibilities using a metric called

average annual daily traffic Annual average daily traffic (AADT) is a measure used primarily in transportation planning, transport engineering, transportation engineering and retail Location_intelligence, location selection. Traditionally, it is the total volume of vehicle tr ...

(AADT). This measurement is a calculation of the traffic level along a segment of roadway for any day of the year. In 2010, INDOT calculated that the section of US 231 with the lowest average daily traffic levels – with 1,100 vehicles and 180 commercial vehicles – was from US 52 to I–65. The peak traffic volumes on US 231 was 27,990 vehicles and 1,950 commercial vehicles AADT along the section concurrent with US 52.

Southern Indiana

US 231 enters Indiana on the

William H. Natcher Bridge The William H. Natcher Bridge is a cable-stayed bridge that carries U.S. Highway 231 over the Ohio River. The bridge connects Owensboro, Kentucky to Rockport, Indiana and opened on October 21, 2002. It is named in honor of William Huston Natche ...

over the

Ohio River The Ohio River () is a river in the United States. It is located at the boundary of the Midwestern and Southern United States, flowing in a southwesterly direction from Pittsburgh, Pennsylvania, to its river mouth, mouth on the Mississippi Riv ...

from Kentucky. The road enters as a four–lane divided highway and immediately has 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 ...

(also called a "parclo" interchange) with State Road 66 (SR 66). The highway heads north passing a large, coal fired power plant (

Rockport Generating Station Rockport Generating Station is a coal-fired power plant, located along the Ohio River in Ohio Township, Spencer County, Indiana, in the United States, near Rockport. The power plant is located along U.S. Route 231 (segment known as the Abraha ...

) and through farmland towards Chrisney; the expressway then

intersects In set theory, the intersection of two sets A and B, denoted by A \cap B, is the set containing all elements of A that also belong to B or equivalently, all elements of B that also belong to A. Notation and terminology Intersection is writt ...

with SR 70. The route turns northeast, passing through woods, just south of Lincoln State Park. The road turns north having an interchange with SR 162; this exit allows access to the State Park, as well as the

Holiday World & Splashin' Safari Holiday World & Splashin' Safari, formerly named Santa Claus Land, is a theme park and water park located in Santa Claus, Indiana, United States. The theme park opened in 1946 and features rides, live entertainment, and games that are divided i ...

theme park, a few miles to the east. The expressway then turns northwest and skirts the south and west sides of Dale. On the south side of town, the roadway intersects SR 62; this is the old route of US 231, which joins the expressway for a brief period before turning east at the junction with SR 68. I–64 is a little more than a mile north from this point, with its interchange just south of the end of the expressway. U.S. 231 enters Dubois County, crossing into the

Eastern Time Zone The Eastern Time Zone (ET) is a time zone encompassing part or all of 23 U.S. states, states in the eastern part of the United States, parts of eastern Canada, and the state of Quintana Roo in Mexico. * Eastern Standard Time (EST) is five ...

. From this point northward through the remainder of Southern Indiana, the highway will remain mostly a rural two-lane road. US 231 heads towards Huntingburg, passing through rural farmland. The highway enters Huntingburg from the south, passing through residential areas. The route has a

traffic light Traffic lights, traffic signals, or stoplights – also known as robots in South Africa, Zambia, and Namibia – are signaling devices positioned at intersection (road), road intersections, pedestrian crossings, and other locations in order t ...

in downtown Huntingburg with SR 64. North of downtown Huntingburg, the road passes through

commercial Commercial may refer to: * (adjective for) commerce, a system of voluntary exchange of products and services ** (adjective for) trade, the trading of something of economic value such as goods, services, information or money * a dose of advertising ...

properties, before leaving town. The highway then heads north towards

Jasper Jasper, an aggregate of microgranular quartz and/or cryptocrystalline chalcedony and other mineral phases, is an opaque, impure variety of silica, usually red, yellow, brown or green in color; and rarely blue. The common red color is due to ...

, passing by a mix of both farmland and woodland. US 231 enters Jasper from the south, passing by commercial lots. West of downtown Jasper, the route begins a

concurrency Concurrent means happening at the same time. Concurrency, concurrent, or concurrence may refer to: Law * Concurrence, in jurisprudence, the need to prove both ''actus reus'' and ''mens rea'' * Concurring opinion (also called a "concurrence"), a ...

with SR 56, with both routes heading east. The concurrency enters downtown and has a traffic light at the northern terminus of SR 164. That is intersection US 231 and SR 56 turn towards the north. The two highways head north into residential areas. The road leaves Jasper heading northeastward toward Loogootee. In Haysville, the concurrency with SR 56 ends. US 231 heads north-northeast from SR 54, before turning more northward. The highway enters Loogootee and begins a concurrency with both

U.S. Route 50 U.S. Route 50 or U.S. Highway 50 (US 50) is a major east–west route of the U.S. Highway system, stretching from Interstate 80 (I-80) in West Sacramento, California, to Maryland Route 528 (MD 528) in Ocean City, Maryland, on the Atlantic ...

(US 50) and US 150. The concurrency travels due north, then turns northeast and enters downtown Loogootee. In downtown, the concurrency ends, with US 50 and US 150 heading east and US 231 heading northwest. The highway then heads north towards Bloomfield, passing the

Naval Surface Warfare Center Crane Division Naval Surface Warfare Center Crane Division (NSWC Crane Division) is the principal tenant command located at Naval Support Activity Crane (NSA Crane) in Indiana. NSA Crane is a United States Navy installation located approximately southwest ...

. It then crosses

I-69 Interstate 69 (I-69) is an Interstate Highway in the United States currently consisting of eight unconnected segments. The longest segment runs from Evansville, Indiana, northeast to the Canada–United States border, Canadian border in Po ...

. The route enters Bloomfield from the south, beginning a concurrency with SR 54 in downtown. This intersection is also the southern terminus of SR 157. US 231 and SR 54 head due west after about , after which SR 54 keeps heading due west and US 231 turns due north. This intersection is the northern terminus of SR 57. US 231 then heads north for about until SR 67. The two routes head northeast heading towards Spencer, along the banks of the White River. The highway turns towards the north away from the river and the concurrency ends. SR 67 heads northeast again and US 231 heads northwest. The road then travels towards Cloverdale, passing through an intersection with SR 42. The route enters Cloverdale passing by a mix of commercial and residential properties. On the north side of Cloverdale, the highway becomes a four-lane divided highway, with an interchange at I–70.

Northern Indiana

North of I–70, US 231 narrows to a two-lane highway, heading towards the northwest. The route has a traffic light at US 40, south of Greencastle. The highway enters Greencastle from the southeast and begins to turn north, passing

DePauw University DePauw University ( ) is a private liberal arts college in Greencastle, Indiana, United States. It was founded in 1837 as Indiana Asbury College and changed its name to DePauw University in 1884. The college has a Methodist heritage and was ...

to the west. In downtown Greencastle, the highway has a traffic light with the western terminus of SR 240. US 231 leaves Greencastle heading further north for Crawfordsville, passing through a traffic light at US 36, a brief concurrency with SR 236, and an intersection with SR 234. On the south side of Crawfordsville, the route becomes a four-lane undivided highway, passing through commercial development. The road then heads toward downtown Crawfordsville, and begins a concurrency with both SR 32 and SR 47. The concurrency passes

Wabash College Wabash College is a private liberal arts men's college located in Crawfordsville, Indiana. Founded in 1832, by a group of Dartmouth College graduates and Midwestern leaders, the institution was originally named "The Wabash Teachers Seminary an ...

and has an intersection with US 136. At this intersection, the concurrency with SR 32 and SR 47 turns east onto US 136. US 231 becomes a four-lane divided highway north of US 136, heading through the north side of Crawfordsville. Through the north side of Crawfordsville, the road passes through mainly residential land, with a few commercial properties near the interchange with I–74. North of I–74, the road returns to a two–lane rural highway and heads north for Lafayette. On the way to Lafayette, the route passes through rural farmland, paralleling a

CSX CSX Transportation , known colloquially as simply CSX, is a Railroad classes, Class I freight railroad company operating in the Eastern United States and the Canadian provinces of Ontario and Quebec. Operating about 21,000 route miles () of trac ...

rail line. The road enters Lafayette and becomes a four-lane divided highway as it runs through a mix of farmland and residential areas. The highway has a traffic light at SR 25 and

US 52 U.S. Route 52 (US 52) is a major United States Numbered Highway System, U.S. Highway in the central United States, Central United States that extends from the northern to southeastern region of the United States. Contrary to most other even ...

. , the route crosses the

Wabash River The Wabash River () is a U.S. Geological Survey. National Hydrography Dataset high-resolution flowline dataThe National Map accessed May 13, 2011 river that drains most of the state of Indiana, and a significant part of Illinois, in the United ...

and heads for

, where it runs along the south and west edges of the

Purdue Purdue University is a public land-grant research university in West Lafayette, Indiana, United States, and the flagship campus of the Purdue University system. The university was founded in 1869 after Lafayette businessman John Purdue donat ...

campus. US 231 continues north for a few miles, then turns westbound. It passes a few commercial properties, and then a few miles west, US 231 leaves the concurrency, while US 52 continues northwest and US 231 heads due north. North of US 52, the highway becomes a two-lane rural highway passing through farmland. US 231 has an interchange with I–65; this is the first of four interchanges with I–65. The route begins a concurrency with US 24 in Wolcott. The two highways head north through Wolcott and then turn due west. After Wolcott, the concurrency crosses into Jasper County and into the

Central Time Zone The North American Central Time Zone (CT) is a time zone in parts of Canada, the United States The United States of America (USA), also known as the United States (U.S.) or America, is a country primarily located in North America. It ...

. The two routes have an interchange at I–65 east of Remington. In Remington, the concurrency ends, with US 24 continuing due west and US 231 heading due north again. The road then enters Rensselaer, heads north and turns northeast, with a traffic light at SR 114. North of the traffic light, the road makes a sharp turn and heads northwest. North of Rensselaer, the route turns north once again, heading towards SR 10. At SR 10, US 231 turns due west, concurrent with the state road. After , the concurrency ends, with SR 10 traveling south and US 231 continuing north. The highway then enters Porter County on a bridge over the

Kankakee River The Kankakee River is a tributary of the Illinois River, approximately long, in the Corn Belt, Central Corn Belt Plains of northwestern Indiana and northeastern Illinois in the United States. At one time, the river drained one of the largest we ...

. North of the Kankakee River, the route begins a concurrency with SR 2 at a

four-way stop An all-way stop – also known as a four-way stop (or three-way stop etc. as appropriate) – is a traffic management system which requires vehicles on all the approaches to a Intersection (road), road intersection to stop at the intersection be ...

south of

Hebron Hebron (; , or ; , ) is a Palestinian city in the southern West Bank, south of Jerusalem. Hebron is capital of the Hebron Governorate, the largest Governorates of Palestine, governorate in the West Bank. With a population of 201,063 in ...

. The concurrency enters Hebron from the south, passing mainly residential areas. The concurrency has an intersection with the western terminus of SR 8 at the main intersection in downtown. North of downtown, the concurrency with SR 2 ends with SR 2 heading due north and US 231 heading northwest. The road leaves Hebron, passing more residential properties and heading towards Crown Point. On the southeast side of Crown Point, the route has its last interchange with I–65. After I–65, the road has an intersection with SR 55. Passing through the southeast side of Crown Point, the road is lined with housing additions on both sides. The road then begins a concurrency with SR 55 and the two highways head for downtown Crown Point. In downtown Crown Point, the routes go around the county courthouse on one-way streets. The concurrency ends when the state road heads due north. US 231 then leaves Crown Point, heading towards its northern terminus on the south side of St. John. The route turns west for the last few miles to meet US 41. US 231 meets US 41 at an intersection controlled by a traffic light.

History

Before US 231

Between 1918 and 1926, US 231 was signed SR 18 from Rockport to Old SR 4 and then followed Old SR 4 to Jasper. From Jasper to Bloomfield, the route consisted of unimproved county roads. From Bloomfield to Switz City, the future US 231 followed Old SR 30. North of Switz City, the road was SR 12, which eventually became SR 67. From Jasper to Lafayette, the road was numbered as SR 32. Where the future US 231 followed SR 29, the route became what is now US 52. From Wolcott to Remington, the route followed SR 7. North of Remington, the road was numbered SR 8 until reaching Hebron. From Hebron to the current terminus was an unimproved county road. This system was changed in 1926 when the

U.S. Highways 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 h ...

were created. The current number system in Indiana was put into place in 1926. The route that would become US 231 was signed as SR 45 from Rockport to SR 58 in

Scotland Scotland is a Countries of the United Kingdom, country that is part of the United Kingdom. It contains nearly one-third of the United Kingdom's land area, consisting of the northern part of the island of Great Britain and more than 790 adjac ...

. From Scotland to Bloomfield, it was an unimproved county road. From Bloomfield to Spencer, the future US 231 was given the same number that the route is concurrent with today. North of Spencer to Lafayette it was numbered SR 43. The route that US 231 follows today along US 52 was the same. The section of US 231 north of US 52 to US 41 was signed as US 152. The US 152 designation was used between February 1935 and 1938; in 1938 US 152 was decommissioned. The road then went back to state road numbers; this lasted until 1952 when US 231 was commissioned and signs installed.

As US 231

US 231 was first signed in Indiana in 1954; the whole length of US 231 was two-lanes. In Southern Indiana, the road has been widened from a two-lane surface road to a four-lane divided expressway. The expressway construction began in 2002 with a new bridge over the Ohio River; the state designated the old bridge near

Owensboro, KY Owensboro is a home rule-class city in Daviess County, Kentucky, United States, of which it is also the county seat. It is the fourth-most populous city in the state. Owensboro is located on U.S. Route 60 and Interstate 165 about southwest ...

as SR 161. When the bridge was completed, traffic had to exit the expressway at the first exit on to SR 66. The expressway was built north towards Dale on all new terrain, with some of the old highway being signed as SR 161, SR 62, and the rest becoming county roads. US 231 was moved onto the expressway on March 15, 2011. In Northern Indiana, a new routing of US 231 around the south and west sides of the Lafayette/West Lafayette area opened September 13, 2013. Previously, US 231 entered downtown Lafayette from the south on 4th Street, passed over the Wabash River on the Harrison Bridge, then continued north and northwest in West Lafayette on Northwestern Avenue passing

Purdue University Purdue University is a Public university#United States, public Land-grant university, land-grant research university in West Lafayette, Indiana, United States, and the flagship campus of the Purdue University system. The university was founded ...

, until merging with US 52.

Future

A project is planned that will possibly put US 231 on a four-lane divided highway around Huntingburg and

in the southern part of the state. However, the final routing has not been determined as of June 2022. Another project for US 231 is planned in

Tippecanoe County Tippecanoe ( ) may refer to several places or things in the United States: * The 1811 Battle of Tippecanoe in Indiana * A nickname for William Henry Harrison (U.S. President March 1841–April 1841) from his role in the battle ** Tippecanoe and Tyl ...

, just northwest of

. This road will be a four-lane divided highway, connecting the section of highway built in 2013 to

I-65 Interstate 65 (I-65) is a major north–south interstate highway in the central United States. As with most primary interstates ending in 5, it is a major crosscountry, north–south route, connecting between the Great Lakes and the Gulf ...

and SR 43.There is no exact time for when this will be built. Indiana has invested in a strip of "electrified highway that could charge even the largest vehicles as they drive over it" on US 231. Research on the project is being conducted by Purdue University's Steve Pekarek, who says the technology could make a transition to electric vehicles more attractive. This segment of highway is in West Lafayette.

Major intersections

References

External links