Missouri Route 100

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Route 100 marker

Route 100
Route information
Length: 121.144 mi[1] (194.962 km)
Major junctions
West end: US 50 in Linn
East end: Chouteau Avenue at the I-44 / I-55 overpass in St. Louis
Counties: Osage, Gasconade, Franklin, St. Louis, St. Louis City
Highway system
Route 99 Route 101

Route 100, also named Manchester Road through St. Louis County and Manchester Avenue through Saint Louis City, is a state highway in the U.S. state of Missouri. It runs from Linn, Missouri at U.S. Route 50 to Interstate 55 in St. Louis. The highway is 121 miles (195 km) long.

Route description[edit]

Route 100 begins at US 50 in Linn. The highway heads north from Linn until it encounters the Missouri River, where it turns eastward to parallel the river. At Chamois, Missouri, it serves as the northern terminus of Route 89. It then enters Gasconade County near Morrison and bridges the Gasconade River near its mouth at the eponymous town. In the county seat, Hermann, Route 100 has a short concurrency with Route 19. The highway passes through New Haven, in Franklin County, 14 miles (23 km)[2] later. The highway then intersects Route 185 at its northern terminus, and Route 47 in Washington. It becomes an expressway outside the city limits, which runs to near Gray Summit. Route 100 crosses over Interstate 44 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 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 from Winchester, Missouri before wholly entering Manchester, where it has a single-point urban interchange (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 in Kirkwood), which carries US 61/67. 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. As Manchester Road 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 Interstate 55 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[edit]

Most of Route 100 is part of the Lewis and Clark Trail. 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.


Much of the road between St. Louis and Gray Summit was the original U.S. Route 66, though this was only temporary until US 66 moved to its later location at what is now Watson Rd (Route 366) and Interstate 44. During, and after US 66 was moved off Manchester Rd, the road remained part of U.S. Route 50 for many years.

Major intersections[edit]

County Location mi[1] km Destinations Notes
Osage Linn 0.000 0.000 US 50 (Main Street) – Linn, Loose Creek
Luystown 5.410 8.707 Route C west / Lewis and Clark Trail west – Frankenstein Western end of Lewis and Clark Trail overlap
Chamois 17.840 28.711 Route 89 south – Linn
Gasconade Hermann 41.181 66.274 Route 19 south (South Market Street) – Swiss Western end of Route 19 overlap
41.895 67.423 Route 19 north (North Market Street) – New Florence Eastern end of Route 19 overlap
Franklin   62.301 100.264 Route 185 south – Beaufort
Washington 70.379 113.264 Route 47 – Union
  76.957 123.850 Route T east / Route V west / Lewis and Clark Trail east – Labadie, Union Eastern end of Lewis and Clark Trail overlap
  80.178 129.034 Route AT west / Historic US 66 west to I-44 / US 50 Western end of Historic US 66 overlap
  82.173 132.245 Loop 44 east / Historic US 66 east Eastern end of Historic US 66 overlap; west end of I-44 Bus. / Historic US 66 (1926-1933) overlap
I-44 / US 50 – St. Clair, Pacific I-44 exit 253; east end of I-44 Bus. overlap
Gray Summit 82.692 133.080 Route MM north – Labadie
St. Louis Wildwood 89.602 144.200 Historic US 66 (1926-1933) east (Manchester Road) Eastern end of Historic US 66 (1926-1933) overlap
93.161 149.928 Route T west / Lewis and Clark Trail west – St. Albans Western end of Lewis and Clark Trail overlap
95.798 154.172 Route 109 (Eatherton Road) Interchange
97.319 156.620 Historic US 66 (1926-1933) west (Manchester Road) Western end of Historic US 66 (1926-1933) overlap
Ellisville 99.042 159.393 Route 340 east (Clarkson Road)
Manchester 103.221–
Route 141 Interchange
Des Peres 106.321 171.107 Des Peres Road Interchange
I-270 – Chicago, Memphis I-270 exit 9
Kirkwood 109.046 175.493 US 61 / US 67 / Lewis and Clark Trail east / Historic US 66 (1936-1965) (North Kirkwood Road) Eastern end of Lewis and Clark Trail overlap
City of St. Louis 114.582 184.402 Historic US 66 (1926-1933) east (McCausland Avenue) Eastern end of Historic US 66 (1926-1933) overlap
117.655 189.347 Historic US 66 (1926-1933) west (Boyle Avenue) Western end of Historic US 66 (1926-1933) overlap
120.674 194.206 Historic US 66 (Tucker Boulevard) Eastern end of Historic US 66 (1926-1933) overlap
121.144 194.962 3rd Street Eastern end of state maintenance (under I-44 / I-55)
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


Route map: Bing / Google

  1. ^ a b Missouri Department of Transportation (August 29, 2015). Flex Map Viewer (Map). Missouri Department of Transportation. Retrieved August 29, 2015. 
  2. ^ Official Highway Map (Map) (2007-2008 ed.). Missouri Department of Transportation.