Missouri Route 109

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Route 109 marker

Route 109
Route information
Maintained by MoDOT
Length: 9 mi (14 km)
Major junctions
South end: MO-supp-W.svg Route W/FF in Unincorporated Jefferson County
North end: Route CC in Chesterfield
Highway system

Missouri Highways
Supplemental

Route 107 Route 110

Route 109 is a highway in St. Louis County, Missouri. Its northern terminus is at Route CC Chesterfield; its southern terminus is at Routes W and FF in Jefferson County. The road continues north as Eatherton Road, curves around Spirit of St. Louis Airport and connects with Chesterfield Airport Road, providing a "backway" to the Chesterfield area.

The original alignment of Route 109 was once Route C and the original route was renamed Route BA (the only such designation in the state). At Eureka, Route 109 crosses under Interstate 44 and continues into Jefferson County until it reaches the intersecion of Routes W and FF.


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