Gravois Avenue (St. Louis)
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| Route information | ||||
| Maintained by MoDOT | ||||
| Length: | 52.718 mi (84.841 km) | |||
| Existed: | 1922 – present | |||
| Major junctions | ||||
| West end: |
 I-44 in St. Clair
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 Route 47 in St. Clair I-270 in Sunset Hills   US 50 / US 61 / US 67 in Sunset Hills |
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| East end: |
 I-44 / I-55 in St. Louis
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| Highway system | ||||
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Route 30 is a highway in eastern Missouri. Its eastern terminus is at the Interstate 55/Interstate 44 junction in St. Louis. Its western terminus is at Interstate 44 in St. Clair. In St. Louis, the section between Interstate 44 and Route 366 is part of historic U.S. Route 66 and is marked as such. In the St. Louis area, it is known as Gravois Avenue or Gravois Road. Further south, Gravois Rd is used to mark the old section of the highway where the newer, divided highway rerouted Highway 30.
Route 30 begins as it crosses over Interstate 55 at I-55's interchange with I-44. The four-lane road turns southwest as Gravois Rd and, after about two miles (3 km), intersects Route 366. Shortly after the intersection with Route 366(where a Quiktrip is now open), the road becomes a narrow street passing through some older parts of St. Louis. At the city limits of St. Louis, it continues into the suburban area (unincorporated). Shortly before reaching Grantwood Village is the northern terminus with Route 21. About two miles (3 km) further west is the intersection with Lindbergh Boulevard (U.S. 50 / U.S. 61 / U.S. 67) and the road becomes a four-lane divided highway. A mile past Lindbergh Boulevard is the junction with I-270, and two miles (3 km) southwest of that is an interchange over Route 141.
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