U.S. Federal Route 61 is a east-west highway across Central St. Charles County. This runs along a expressway corridor through the entire county. From the Missouri River to near Dardenne Prairie it runs with Interstate 64. Dardenne Prairie to Interstate 70 this is being up-graded to a expressway. U.S. Rt. 61 becomes a expressway again from Interstate 70 to the St. Charles/Lincoln County Line. U.S. Rt. 61 passes thorugh the following towns in St. Charles County. Weldon Springs
St. Peters
Dardenne Prairie
O'fallon
Lake St. Louis
Wentzville
U.S. Rt. 61 is multi-plexed in St. Charles County. Interstate 64, from the St. Louis/St. Charles County Line to near Darenne Park. U.S. Rt. 40, from the St. Louis/St. Charles County Line to Wentzville.
WB I-64/U.S. Rt. 40; NB U.S. Rt. 61 at the Boone Bridge. EB I-64/U.S. Rt. 40; SB U.S. Rt. 61 crossing the Missouri River. EB I-64/U.S. Rt. 40; SB U.S. Rt. 61 at the Missouri River. EB I-64/U.S. Rt. 40; SB U.S. Rt. 61 east of Research Park Circle. WB I-64/U.S. Rt. 40; NB U.S. Rt. 61 at Research Park Cirle. WB I-64/U.S. Rt. 40; NB U.S. Rt. 61 at MO St Rt 94. EB I-64/U.S. Rt. 40; SB U.S. Rt. 61 east of MO St Rt 94. A junction marker on WB MO St Rt 94. A BGS on WB MO St Rt 94. WB I-64/U.S. Rt. 40; NB U.S. Rt. 61 in Weldon Springs. WB I-64/U.S. Rt. 40; NB U.S. Rt. 61 at Town Square Road. WB I-64/U.S. Rt. 40; NB U.S. Rt. 61 at MO Sec St Rt DD. EB I-64/U.S. Rt. 40; SB U.S Rt. 61 south of MO St Rt 364/MO Sec St Rt N. WB I-64/U.S. Rt. 40; NB U.S. Rt. 61 south of MO St Rt 364/MO Sec St Rt N. WB I-64/U.S. Rt. 40; NB U.S. Rt. 61 near MO Sec St Rt N. EB I-64/U.S. Rt. 40; SB U.S. Rt. 61 at MO St Rt 364/MO Sec St Rt N. A BGS on WB MO St Rt 364. A BGS on WB MO St Rt 364. A BGS on WB MO St Rt 364. A BGS on WB MO St Rt 364. A BGS on EB MO St Rt 364. A BGS on EB MO St Rt 364. A junction marker on EB MO Sec St Rt N. EB I-64/U.S. Rt. 40; SB U.S. Rt. 61 west of MO St Rt 364/MO Sec St Rt N. WB I-64/U.S. Rt. 40; NB U.S. Rt. 61 west of MO St Rt 364/MO Sec St Rt N. WB I-64/U.S. Rt. 40; NB U.S. Rt. 61 near Lake St. Louis. WB U.S. Rt. 40; NB U.S. Rt. 61 near Lake St. Louis. WB U.S. Rt. 40; NB U.S. Rt. 61 in Lake St. Louis. Several interchanges have been built along U.S. Rt. 40/61, but the expressway has not been complete. Thus the roadway shifts several times. (July, 2004) The same point as the photo above. (July, 2009) EB I-64/40; SB U.S. Rt. 61 east of Prospect Road. WB U.S. Rt. 40/U.S. Rt. 61 near Prospect Road. WB I-64/U.S. Rt. 40; NB U.S. Rt. 61 near Prospect Road. (September, 2010) WB U.S. Rt. 40/U.S. Rt. 61 near one of the last overpasses to be built. (July, 2009) WB I-64/U.S. Rt. 40; NB U.S. Rt. 61 at Prospect Road. WB I-64/U.S. Rt. 40; NB U.S. Rt. 61 one mile from I-70. WB U.S. Rt. 40/NB U.S. Rt. 61 south of I-70. WB U.S. Rt. 40/NB U.S. Rt. 61 at EB I-70. (July, 2009) The same point as the photo above. (July, 2009) WB I-64/U.S. Rt. 40; NB U.S. Rt. 61 at EB I-70. (June, 2019) WB I-64/U.S. Rt. 40; NB U.S. Rt. 61 at WB I-70. (June, 2019) A BGS on EB I-70. A BGS on WB I-70. A BGS on WB I-70. A BGS on WB I-70. A BGS on EB I-70/U.S. Rt. 40. A BGS on EB I-70/U.S. Rt. 40. NB U.S. Rt. 61 north of I-70/U.S. Rt. 40. NB U.S. Rt. 61 north of I-70/U.S. Rt. 40. NB U.S. Rt. 61 near MO Sec St Rt P. NB U.S. Rt. 61 at MO Sec St Rt P. NB U.S. Rt. 61 south of MO Sec St Rt W. NB U.S. Rt. 61 north of MO Sec St Rt W. NB U.S. Rt. 61 near the Lincoln/St. Charles County Line.