U.S. Route 50 in Illinois

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This article is about the section of U.S. Route 50 in Illinois. For the entire route, see U.S. Route 50.

U.S. Route 50 marker

U.S. Route 50
Route information
Maintained by IDOT
Length: 165.79 mi[1] (266.81 km)
Existed: 1926 – present
Major junctions
West end: US 50 / I-255 in Columbia
  I-64 / I-255 in Washington Park
I-64 / IL 158 in O'Fallon
US 51 in Sandoval
I-57 in Salem
US 45 in Flora
East end: US 50 in Lawrenceville
Highway system
IL 49 IL 50

In the U.S. state of Illinois, U.S. Route 50 is an east–west highway across the southern portion of the state. It runs from the Jefferson Barracks Bridge over the Mississippi River to Missouri east to the Red Skelton Memorial Bridge over the Wabash River to Indiana. This is a distance of 165.79 miles (266.81 km).[1]

Route description[edit]

U.S. 50 runs east–west across the southern portion of the state, between Interstate 70 to the north and Interstate 64 to the south. Along many portions of U.S. 50, the road has been moved onto either a bypass or an expressway.


Much of U.S. Route 50 in Illinois, especially the section between Carlyle, Illinois and Vincennes, lies atop or adjacent to the trail taken by George Rogers Clark and his 170 volunteers in the forlorn-hope march on Vincennes in February 1779.

As of 2011, much of U.S. 50 is a two-lane highway, but portions around Lawrenceville, IL and Vincennes, IN are configured as a four-lane, limited access bypass, built to interstate standards in the 1960s. Another modern bypass portion between O'Fallon, IL and IL-127 shows evidence of a four-lane right of way as each bridge is paralleled by a second that remains unused and the graded road bed for additional lanes is visible. This is because it was originally meant to be the route of Interstate 64 until political leaders lobbied for and secured a more southerly route.

Major intersections[edit]

County Location mi km Destinations Notes
Monroe 0.00 0.00 I-255 west / US 50 west – Mehlville Missouri state line
IL 3 south Southern end of IL 3 concurrency
St. Clair IL 3 north – Cahokia Northern end of IL 3 concurrency
IL 157
East St. Louis IL 15
I-64 west / I-255 north – St. Louis, Chicago Northern end of I–255 concurrency; western end of I–64 concurrency
Fairview Heights IL 157
IL 159
O'Fallon I-64 east / IL 158 Eastern end of I–64 concurrency
Lebanon IL 4 south – Mascoutah Southern end of IL 4 concurrency
IL 4 north Northern end of IL 4 concurrency
Clinton Trenton IL 160
Carlyle IL 127 north Northern end of IL 127 concurrency
IL 127 south Southern end of IL 127 concurrency
Marion Sandoval US 51 – Centralia, Vandalia
Salem I-57 – Mt. Vernon, Effingham
IL 37 – Mt. Vernon, Effingham
Clay Flora US 45 north – Effingham Western end of US 45 concurrency
US 45 south – Fairfield Eastern end of US 45 concurrency
Richland IL 250 east Western terminus of IL 250
Olney IL 130
IL 250 west Western end of IL 250 concurrency
Lawrence IL 250 east Eastern end of IL 250 concurrency
US 50 Bus. east
Western terminus of US 50 BUS
IL 1 – Lawrenceville, Marshall

US 50 Bus. west
Eastern terminus of US 50 BUS
IL 33 north Southern terminus of IL 33
US 50 east Indiana state line
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


Route map: Bing / Google

  1. ^ a b Illinois Technology Transfer Center (2007). "T2 GIS Data". Retrieved 2007-11-08. 

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