Missouri Route 100
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| Route information | ||||
| Length: | 121.144 mi (194.962 km) | |||
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| West end: |
 US 50 in Linn
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| East end: | Chouteau Avenue at the I-44 / I-55 overpass in St. Louis | |||
| Location | ||||
| Counties: | Osage, Gasconade, Franklin, St. Louis, St. Louis City | |||
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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 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) 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.
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