Missouri Route 370
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| Route information | ||||
| Length: | 12.957 mi (20.852 km) | |||
| Existed: | 1993 – present | |||
| Major junctions | ||||
| West end: |
 I-70 in St. Peters
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 Route 94 in St. Charles Route 141 in Bridgeton
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| East end: |
 I-270 in Bridgeton |
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| Highway system | ||||
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Missouri Route 370 (Route 370) is a freeway that connects St. Louis County with St. Charles County via the Discovery Bridge over the Missouri River.
From west to east, Route 370 begins in St. Peters at Interstate 70 east of Mid Rivers Mall Drive and ends in Bridgeton at Interstate 270 west of Missouri Bottom Rd.
Construction on Route 370 began in the early 1990s. It was built to replace the section of St. Charles Rock Road, then designated as Route 115, west of Interstate 270.
Route 370 was considered to be Interstate 370 but AASHTO would only allow it if it was renumbered Interstate 870. MODOT did not want this and kept it as Route 370.
On December 16, 1992, the first section of the highway opened allowing direct access to St. Charles at Route 94 from I-270. It replaced the crumbling Old St. Charles Bridge that carried Route 115 traffic. On April 1, 1993, the road was designated as Route 370. In 1993, the Great Flood of 1993 surrounded much of the highway which is built on top of an embankment. As the flood waters surrounded the highway, many of the new exits had been shut down because the roads it connected to were underwater. Despite the flood, construction resumed on the highway until it was completed in 1996.
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