Route 141, also known as Woods Mill Road in parts of St. Louis County,
St. Louis County
Route 141 enters St. Louis County in Fenton. It has an interchange with Route 30 and widens into a six- to eight-lane divided highway. Heading north, Route 141 passes a plaza to the left that includes various restaurants. After the plaza, Route 141 heads into a suburban area and has at-grade interchanges with several collector roads. The highway heads northeast and has an interchange with Interstate 44 in Valley Park. Shortly after this interchange, Route 141 crosses the Meramec River and the Meramec River Greenway and enters Valley Park. In 1976, Frank Kriz, then the district state highway engineer, called 141 an "old ridge-runner." The highways had traffic jams due to suburban growth. That same year, construction began for a new, four-lane Highway 141 in Jefferson County. Subsequent progress included a new bridge over the Meramec River at Valley Park in 1986 and a new interchange at Manchester Road in 1999. 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. During heavy rain, the current intersection at Creve Coeur Mill Road and Olive has the potential to flood, and most of the area along Creve Coeur Mill Road are either wetlands or farmland that lies in a flood plain.
St. Louis County Executive Charlie Dooley had called the project "one of St. Louis County's largest and most important infrastructure improvements this decade." The economic impact of the construction project was not nearly as massive as the upgrading and realignment project on Interstate 64/Highway 40. This construction project was estimated to have a $20 billion economic impact and create over 170,000 jobs during the 2010 decade.