Missouri Route 30

Route 30 begins as it crosses over Interstate 55 at I-55's interchange with I-44. The four-lane road turns southwest as Gravois Rd and, after about two miles (3.2 km), intersects Route 366. Shortly after the intersection with Route 366, the road becomes a narrow street passing through some older parts of St. Louis. At the city limits of St. Louis, it continues into the suburban area (unincorporated). Shortly before reaching Grantwood Village is the northern terminus with Route 21. About two miles (3.2 km) further west is the intersection with Lindbergh Boulevard (U.S. 50 / U.S. 61 / U.S. 67) and the road becomes a four-lane divided highway. A mile past Lindbergh Boulevard is the junction with I-270, and two miles (3.2 km) southwest of that is an interchange over Route 141.

As the highway continues southwest in the suburban St. Louis area, the road has several traffic lights which gradually diminish as the road approaches Cedar Hill. West of Cedar Hill, the divided highway ends and the road becomes a winding road all the way to its end. A portion of the highway over the Meramec River was re-routed in the early 2000s when a new, wider bridge was built.

West of Lonedell is the beginning of a concurrency with Route 47. The concurrency ends five miles (8.0 km) later inside the city limits of St. Clair. The road briefly joins former U.S. Route 66, turns a corner, and ends at Interstate 44.

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