Route 340 | ||||
|---|---|---|---|---|
MO 340 highlighted in red
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| Route information | ||||
| Maintained by MoDOT | ||||
| Length | 19.726 mi[1] (31.746 km) | |||
| Major junctions | ||||
| West end |  Route 100 (Manchester Road) in Ellisville | |||
| Major intersections |
| |||
| East end | Ferguson Avenue in University City | |||
| Location | ||||
| Country | United States | |||
| State | Missouri | |||
| Highway system | ||||
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Route 340 also called Clarkson RoadorOlive Boulevard is a highway in the St. Louis metropolitan area. Its western terminus is Route 100 (Manchester Road) in Ellisville, and its eastern terminus is at an intersection with Ferguson Avenue and Olive Boulevard in University City. The stretch of Route 340 between Manchester Road and the Interstate 64 / U.S. 40 / U.S. 61 interchange is known locally as Clarkson Road. The remainder of Route 340 between this intersection and its eastern terminus is variously known as Olive Boulevard (which does not connect with Olive Street in the city of St. Louis). Route 340 ends at Ferguson Avenue in University City, but Olive Boulevard continues to Skinker Boulevard on the St. Louis city line.
MetroBus Route 91 (Olive) travels the entirety of the Olive Street Road and Olive Boulevard part of Route 340 from Chesterfield Mall to the Delmar Loop. Part of MetroBus Route 58X (Twin Oaks Express) travels along the entirety of Clarkson Road.
The entire route is in St. Louis County.
| Location | mi[1] | km | Destinations | Notes | |
|---|---|---|---|---|---|
| Ellisville | 0.000 | 0.000 | Route 100 (Manchester Road) / Kiefer Creek Road south | Southern terminus | |
| Chesterfield | 4.130 | 6.647 | Chesterfield Parkway | Interchange | |
| 4.601 | 7.405 |     I-64 / US 40 / US 61 (Avenue of the Saints) – Wentzville, St. Louis | Exit 19B on I-64 / US 40 / US 61 | ||
| 8.942 | 14.391 |  Route 141 (Maryland Heights Expressway) | Single point urban interchange | ||
| Creve Coeur | 11.503 | 18.512 |  I-270 | Exit 14 on I-270 | |
| 13.983 | 22.503 |  US 67 (Lindbergh Boulevard) | Cloverleaf interchange | ||
| Olivette | 16.310 | 26.248 |  I-170 | Exit 3 on I-170 | |
| University City | 19.726 | 31.746 | Ferguson Avenue / Olive Boulevard east | Eastern terminus | |
| 1.000 mi = 1.609 km; 1.000 km = 0.621 mi | |||||
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