| Route 340 | ||||
|---|---|---|---|---|
| Olive Boulevard/Olive Street Road/Clarkson Road | ||||
| Route information | ||||
| Maintained by MoDOT | ||||
| Length: | 19 mi (31 km) | |||
| Major junctions | ||||
| West end: | Route 100 in Ellisville | |||
| East end: | Ferguson Avenue & Olive Boulevard in University City | |||
| Highway system | ||||
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Missouri Highways
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Highway 340 is a highway in the St. Louis metropolitan area. Its eastern terminus is at Ferguson Avenue in University City and its western terminus is at Route 100 Manchester Road in Ellisville. The stretch of Highway 340 between Manchester Road and I-64/US 40 is locally known as Clarkson Rd. The remainder of Highway 340 between this intersection and its eastern terminus is variously known as Olive Boulevard and Olive Street Road. It does not connect with Olive Street in St. Louis City.
Olive Boulevard ends at Skinker Boulevard near the University City/St. Louis City Limit.
Clarkson Road continues on as Kiefer Creek Road in Ellisville.
| County | Location | Mile[1] | Destinations | Notes |
|---|---|---|---|---|
| St. Louis |
Ellisville | 0.0 | Route 100 (Manchester Rd) | Western terminus, continues South as Kiefer Creek Road |
| Clarkson Valley | 0.8 | Route HH (Clayton Rd) | ||
| Chesterfield | 4.1 | Chesterfield Pkwy | Interchange | |
| 4.6 | I-64/US 40/61 | Diamond interchange | ||
| 8.6 | Route 141 (Woods Mill Road) | Northern terminus of Route 141 | ||
| Creve Coeur Mill Rd | A construction project is underway that will reroute Route 141 from its current location to connect to Creve Coeur Mill Road. | |||
| Creve Coeur | 11.5 | I-270 | SPUI | |
| 14.0 | US 67 (Lindbergh Boulevard) | Cloverleaf interchange | ||
| Olivette | 16.3 | I-170 | Interchange | |
| University City | 19.2 | Ferguson Ave | Eastern terminus, continues East as Olive Boulevard | |
| 1.000 mi = 1.609 km; 1.000 km = 0.621 mi | ||||
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.
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