Route 100, also named Manchester Road through St. Louis County and Manchester Avenue and Chouteau Avenue through St. Louis City, is a

state highway A state highway, state road, or state route (and the equivalent provincial highway, provincial road, or provincial route) is usually a road that is either Route number, numbered or maintained by a sub-national state or province. A road numbered ...

in the

U.S. state In the United States, a state is a constituent political entity, of which there are 50. Bound together in a political union, each state holds governmental jurisdiction over a separate and defined geographic territory where it shares its so ...

Missouri Missouri (''see #Etymology and pronunciation, pronunciation'') is a U.S. state, state in the Midwestern United States, Midwestern region of the United States. Ranking List of U.S. states and territories by area, 21st in land area, it border ...

. It runs from

Linn, Missouri Linn is a city and the county seat of Osage County, Missouri, United States. The population was 1,350 at the 2020 census. Linn is part of the Jefferson City, Missouri Metropolitan Area. History Linn was platted in 1843. The community was named ...

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 ...

Interstate 55 Interstate 55 (I-55) is a major Interstate Highway in the central United States. As with most primary Interstates that end in a five, it is a major cross-country, north–south route, connecting the Gulf of Mexico to the Great Lakes. The ...

St. Louis St. Louis ( , sometimes referred to as St. Louis City, Saint Louis or STL) is an independent city in the U.S. state of Missouri. It lies near the confluence of the Mississippi and the Missouri rivers. In 2020, the city proper had a populatio ...

. The highway is long.

Route description

Route 100 begins at

US 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 ...

Linn Linn may refer to: People * Linn (surname) * Linn (given name) * Carl Linnaeus, abbreviated as Linn. * Linn da Quebrada, stage name of Brazilian singer, actress, screenwriter and television personality Lina Pereira dos Santos (born 1990) Place ...

. The highway heads north from Linn until it encounters the

Missouri River The Missouri River is a river in the Central United States, Central and Mountain states, Mountain West regions of the United States. The nation's longest, it rises in the eastern Centennial Mountains of the Bitterroot Range of the Rocky Moun ...

, where it turns eastward to parallel the river. At

Chamois, Missouri Chamois is a city in Osage County, Missouri, Osage County, Missouri, United States. The population was 377 at the 2020 United States census, 2020 census. It is part of the Jefferson City, Missouri Jefferson City, Missouri Metropolitan Area, Metro ...

, it serves as the northern terminus of Route 89. It then enters Gasconade County near

Morrison Morrison may refer to: People * Morrison (surname), people with the Scottish surname Morrison * Morrison Heady (1829–1915), American poet * Morrison Mann MacBride (1877–1938), Canadian merchant Places in the United States * Morrison, Colorad ...

and bridges the

Gasconade River The Gasconade River is about longU.S. Geological Survey. National Hydrography Dataset high-resolution flowline dataThe National Map, accessed May 31, 2011 and is located in central and south-central Missouri. The Gasconade River begins in the O ...

near its mouth at the eponymous town. In the county seat, Hermann, Route 100 has a short

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 Route 19. The highway passes through

New Haven New Haven is a city of the U.S. state of Connecticut. It is located on New Haven Harbor on the northern shore of Long Island Sound. With a population of 135,081 as determined by the 2020 U.S. census, New Haven is the third largest city in Co ...

, in Franklin County, later. The highway then intersects Route 185 at its northern terminus, and Route 47 in

Washington Washington most commonly refers to: * George Washington (1732–1799), the first president of the United States * Washington (state), a state in the Pacific Northwest of the United States * Washington, D.C., the capital of the United States ** A ...

. It becomes an expressway outside the city limits, which runs to near Gray Summit. Route 100 crosses over

Interstate 44 Interstate 44 (I-44) is an Interstate Highway in the central United States. Although it is nominally an east–west road as it is even-numbered, it follows a more southwest–northeast alignment. Its western terminus is in Wichita Falls, T ...

two times, with an interchange providing access to the freeway. Northeast of Gray Summit, Route 100 crosses into St. Louis County, entering the city limits of Wildwood at the same time. Just north of the intersection with Route T, the highway becomes an expressway again. In Wildwood, it has an interchange with

Route 109 Route 109 or Highway 109 can refer to multiple roads: Canada * New Brunswick Route 109 * Ontario Highway 109 * Prince Edward Island Route 109 * Quebec Route 109 China * China National Highway 109 Costa Rica * National Route 109 (Costa Ric ...

. Route 100 then enters Ellisville, where the expressway ends. From here all the way into St. Louis, the highway also carries the local name Manchester Road. In Ellisville, Route 340 (Clarkson Road) meets its southern terminus. Route 100 then proceeds into Ballwin. It then divides

Manchester Manchester () is a city and the metropolitan borough of Greater Manchester, England. It had an estimated population of in . Greater Manchester is the third-most populous metropolitan area in the United Kingdom, with a population of 2.92&nbs ...

from Winchester, Missouri before wholly entering Manchester, where it has a

single-point urban interchange A single-point urban interchange (SPUI, or ), also called a single-point interchange (SPI) or single-point diamond interchange (SPDI), is a type of highway interchange. The design was created in order to help move large volumes of traffic th ...

(SPUI) with Route 141. Route 100 then runs through a swath of unincorporated territory en route to Des Peres. The route crosses over Interstate 270, the St. Louis beltway, in that town. East of Ellisville, Route 100 enters Kirkwood; there, Manchester Road intersects Kirkwood Road (the name given to

Lindbergh Boulevard Lindbergh Boulevard, named after the aviator, Charles Lindbergh, is a section of U.S. Routes 61 and 67 that extends through Missouri. Lindbergh Boulevard is home to Missouri's only traffic tunnel underneath a runway at Lambert–St. Louis ...

in Kirkwood), which carries

US 61 U.S. Route 61 or U.S. Highway 61 (U.S. 61) is a major United States highway that extends between New Orleans, Louisiana and the city of Wyoming, Minnesota. The highway generally follows the course of the Mississippi River and is designat ...

/ 67. Route 100 then passes through the smaller suburbs of Warson Woods, Glendale, Rock Hill, Brentwood, and Maplewood. After leaving Maplewood, Route 100 continues into the independent City of St. Louis where the name changes from "Manchester Road" to "Manchester Avenue." As Manchester Avenue crosses Vandeventer Avenue, the highway becomes Chouteau Avenue. Route 100 continues east on Chouteau Avenue towards Downtown St. Louis. The route ends just east of South Broadway, at the

overpass. Due to the nearby east terminus of I-44, there is no interchange with I-55 at the state route's terminus.

The Lewis and Clark Trail

Most of Route 100 is part of the

Lewis and Clark Trail The Lewis and Clark National Historic Trail is a route across the United States commemorating the Lewis and Clark Expedition of 1804 to 1806. It is part of the National Trails System of the United States. It extends for some from Pittsburgh, Pe ...

. From Kirkwood Rd in Kirkwood to three miles (5 km) west of Wildwood is one section, where the trail turns off on Route T. Route T will eventually end, once again, at Route 100 northwest of I-44 and continue down Route 100 all the way to five miles (8 km) north of Linn (where Route 100 ends), and the Lewis and Clark Trail turns off onto Route C.

History

Much of the road between

and Gray Summit was the original

U.S. Route 66 U.S. Route 66 or U.S. Highway 66 (US 66 or Route 66) is one of the original highways in the United States Numbered Highway System. It was established on November 11, 1926, with road signs erected the following year. The high ...

, though this was only temporary until US 66 moved to its later location at what is now Watson Rd ( Route 366) and

. During, and after US 66 was moved off Manchester Rd, the road remained part of

for many years.

Major intersections

References

{{Reflist

100 100 or one hundred (Roman numeral: C) is the natural number following 99 and preceding 101. In mathematics 100 is the square of 10 (in scientific notation it is written as 102). The standard SI prefix for a hundred is " hecto-". 100 is the b ...

Streets in St. Louis U.S. Route 50 Transportation in Osage County, Missouri Transportation in Gasconade County, Missouri Transportation in Franklin County, Missouri Transportation in St. Louis County, Missouri