Missouri Route 109

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Route 109

MO 109 highlighted in red
Route information
Maintained by MoDOT
Length13.128 mi[1] (21.127 km)
Major junctions
South end Route W / Route FF in Jefferson County
Major intersections I-44 / US 50 in Eureka Route 100 in Wildwood
North end Route CC (Wild Horse Creek Road) in Chesterfield
CountryUnited States
CountiesJefferson, St. Louis County
Highway system
Route 108
Route 110 (CKC)

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


Route description

The Missouri Department of Transportation commissioned Route 109 sometime between 1937 and 1938 as a state-maintained access road to Babler Memorial State Park from Route C in St. Louis County.[2][3] What is now the current alignment of Route 109 was then designated as Route C and ran north from Route 100 to its terminus at Route CC (Wild Horse Creek Road) in Chesterfield. The portion of Route 109 running south from Route 100 was signed as Route B and terminated at Interstate 44.

Sometime between 1956 and 1957, the Route 109 designation was extended to cover Route C south of Babler State Park and Route B between Route 100 and Interstate 44.[4][5] A bridge was built over the Meramec River linking Route W from Jefferson County to Route 109's southern terminus at Interstate 44 in 1974,[6][7] but this bridge was later designated to carry Route 109 into Jefferson County, moving its southern terminus to the intersection of Routes W and FF just south of the Meramec River.

In 1999, Route C was fully decommissioned in St. Louis County. Route 109 assumed Route C's previous alignment and the old section of Route 109 that ran to Babler State Park was renamed Route BA (the only such route designation in Missouri).[8] This change renamed the last remaining section of Route 109's original routing.

Major intersections


Route W south / Route FF south – House Springs, Catawissa
St. LouisEureka2.1863.518 I-44 / US 50 – St. Louis, Rolla
Wildwood8.37613.480 Route 100 – Ellisville, Gray SummitInterchange
Route BA north – Babler State Park
Route BA south – Babler State Park
Route CC east (Wild Horse Creek Road) / Eatherton Road
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


  1. ^ a b Missouri Department of Transportation (July 17, 2012). MoDOT HPMAPS (Map). Missouri Department of Transportation. Retrieved July 17, 2012.
  2. ^ Missouri State Highway Commission (1937). Official 1937 Missouri Road Map (Map) (1937 ed.). Jefferson City: Missouri State Highway Commission.
  3. ^ Missouri State Highway Commission (1938). Missouri Official Highway Map 1938 (Map) (1938 ed.). Jefferson City: Missouri State Highway Commission.
  4. ^ Missouri State Highway Commission (1956). Map of the Missouri State Highway System (Map) (1956 ed.). Jefferson City: Missouri State Highway Commission.
  5. ^ Missouri State Highway Commission (1957). Map of the Missouri State Highway System (Map) (1957 ed.). Jefferson City: Missouri State Highway Commission.
  6. ^ Missouri State Highway Commission (1973). 1973 Official Highway Map (Map) (1973 ed.). Jefferson City: Missouri State Highway Commission.
  7. ^ Missouri State Highway Commission (1974). 1974 Official Highway Map (Map) (1974 ed.). Jefferson City: Missouri State Highway Commission.
  8. ^ Missouri Department of Transportation (2000). Official Highway Map 1999-2000 (Map) (1999-2000 ed.). Jefferson City: Missouri Department of Transportation.