Missouri Route 141

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Route 141 marker

Route 141
Route information
Maintained by MoDOT
Length30.902 mi[1] (49.732 km)
Major junctions
South end US 61 / US 67 in Arnold
  I-55 in Arnold
I-44 / US 50 in Fenton
I-64 / US 40 / US 61 in Town & Country
Route 364 in Maryland Heights
I-70 in Maryland Heights
North end Route 370 in Bridgeton
CountiesJefferson, St. Louis
Highway system
Route 139Route 142

Highway 141 is a highway located in the western St. Louis metropolitan area. Its northern terminus is at Route 370 in Bridgeton; its southern terminus is at U.S. Route 61/U.S. Route 67 in Arnold, in Jefferson County. The northern stretches of the highway are often referred to as the Maryland Heights Expressway or the Earth City Expressway.

Route description[edit]

The section of Route 141 between Interstate 64 and the St. Louis County/Jefferson County line was upgraded to six lanes in a project completed in 2003. The section in Jefferson County is four lanes. For the majority of its duration, 141 is a divided highway with four to eight lanes.


As of August, 2012, a new six-lane realignment opened between Ladue Road and Page Avenue (Route 364), with interchanges at Ladue, Olive (Route 340), and Page. The section between Page and Olive (tentatively titled the Page-Olive Connector), which was constructed by St. Louis County has been turned over to the Missouri Department of Transportation and designated as Route 141. Maryland Heights Expressway (the section from Page north to I-70) and Earth City Expressway (the section from I-70 north to its terminus at Route 370) have also been designated as 141. As such, Route 141 now runs from US 61/67 in Arnold to Route 370 in Bridgeton.

Major intersections[edit]

JeffersonArnold0.0000.000 US 61 / US 67 (Jeffco Boulevard)Southern terminus at an at-grade intersection
0.3790.610 I-55 – St. Louis, Cape GirardeauHybrid interchange (SPUI and diamond); exit 191 on I-55
3.5855.769 Route 21 – St. Louis, HillsboroDiamond interchange
St. LouisFenton7.58312.204 Route 30 – St. Louis, St. ClairDiamond interchange
11.12717.907 I-44 / US 50 – St. Louis, RollaExit 272 on I-44 / US 50
11.27818.150North Outer RoadInterchange
Twin Oaks13.25521.332Big Bend RoadSPUI
Manchester15.13724.361 Route 100 / Lewis and Clark Trail (Manchester Road)SPUI
Town & Country17.45628.093Clayton RoadInterchange
18.21329.311Salt Mill Road / South Outer Forty DriveInterchange
18.66530.038 I-64 / US 40 / US 61 – St. Louis, WentzvilleExit 22 on I-64 / US 40 / US 61.
Chesterfield19.97432.145 Route AB (Ladue Road)SPUI
21.61134.780 Route 340 (Olive Boulevard)SPUI
Maryland Heights23.56337.921 Route 364 – St. Louis, St. CharlesExit 17 on Route 364
27.98345.034 I-70 – St. Louis, Kansas CityCloverleaf interchange; exit 231 on I-70
Bridgeton29.70947.812St. Charles Rock RoadAt-grade-intersection
30.76349.508 Route 370 – St. Louis, St. CharlesNorthern terminus at a diamond interchange; exit 9 on Route 370
30.90249.732Missouri Bottom Road northContinuation beyond northern terminus
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


  1. ^ a b Missouri Department of Transportation (March 19, 2015). MoDOT HPMAPS (Map). Missouri Department of Transportation. Retrieved March 19, 2015.