Missouri Route 109

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Route 109
Maintained by MoDOT
Length: 9 mi (14 km)
North end: Chesterfield
South end: Eureka
Major cities: Chesterfield
Wildwood
Eureka
Missouri Highways
Supplemental - Decommissioned


Route 109 is a highway in St. Louis County, Missouri. Its northern terminus is at Missouri Supplemental Route CC Chesterfield; its southern terminus is at Route W and FF in Eureka. The road continues north as Eatherton Road, curves around Spirit of St. Louis Airport and connects with Interstate 64/U.S. Highway 40 providing a "backway" to the St. Charles area.

The original alignment of Missouri 109 was once Supplemental Route C and the original route was renamed Supplemental Route BA (the only such designation in the state). For a picture of Route BA, see Missouri Supplemental Route. At Eureka, Missouri 109 crosses under Interstate 44 and continues as Missouri Supplemental Route W.