Missouri Route 340

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Route 340 marker

Route 340
Route information
Maintained by MoDOT
Length: 19.726 mi[1] (31.746 km)
Major junctions
West end: Route 100 in Ellisville
  I-64 / US 40 / US 61 in Chesterfield
I-270 in Creve Coeur
I-170 in Olivette
East end: Ferguson Avenue in University City
Highway system
Route 291 Route 350

Route 340 is a highway in the St. Louis metropolitan area. Its western terminus is Route 100 (Manchester Road) in Ellisville, and its eastern terminus isat 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 St. Louis city line.

Route description[edit]

Mass transit[edit]

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.


Major intersections[edit]

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
Clarkson Valley 0.846 1.362 Route HH (Clayton Road)
Chesterfield 4.130 6.647 Chesterfield Parkway Interchange
4.601 7.405 I-64 / US 40 / US 61 – 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


  1. ^ a b Missouri Department of Transportation (March 18, 2015). Flex Map Viewer (Map). Missouri Department of Transportation. Retrieved March 18, 2015.