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|Maintained by MoDOT|
|Length||52.718 mi  (84.841 km)|
|West end||I-44 in St. Clair|
Route 47 in St. Clair|
I-270 in Sunset Hills
US 50 / US 61 / US 67 in Sunset Hills
|East end||I-44 / I-55 in St. Louis|
Route 30 is a highway in eastern Missouri. Its eastern terminus is at the Interstate 55/ Interstate 44 junction in St. Louis. Its western terminus is at Interstate 44 in St. Clair. In St. Louis, the section between Interstate 44 and Route 366 is part of historic U.S. Route 66 and is marked as such. In the St. Louis area, it is known as Gravois Avenue or Gravois Road. Further south, Gravois Rd is used to mark the old section of the highway where the newer, divided highway rerouted Highway 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 km), intersects Route 366. Shortly after the intersection with Route 366(where a Quiktrip is now open), 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 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 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 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.
The southern half of MetroBus Route #10 (Lindell-Gravois) follows Gravois Ave from the Civic Center Station at 14th and Spruce, then onto Tucker and Chouteau. From Tucker, the route follows nearly the entirety of Gravois Ave until it reaches the Hampton Loop at Hampton and Gravois.
|Franklin||St. Clair||0.000||0.000||Route AB north / Route WW west / Historic US 66 west||Western terminus of Route 30 and concurrency with Historic US 66;|
continuation beyond western terminus
|0.088||0.142||I-44 – Rolla, St. Louis||Western terminus; exit 239 on I-44|
|0.453||0.729||Route 47 north / Historic US 66 east (Commercial Avenue)||Eastern terminus of concurrency with Historic US 66;|
western terminus of concurrency with Route 47
|0.769||1.238||Route PP south (Sycamore Avenue)||Northern terminus of Route PP|
|||1.817||2.924||Route K south||Northern terminus of Route K|
|||6.657||10.713||Route 47 south – Richwoods||Eastern terminus of concurrency with Route 47|
|Lonedell||9.859||15.867||Route N north||Southern terminus of Route N|
|9.920||15.965||Route FF south||Northern terminus of Route FF|
|||12.505||20.125||Route HH north||Southern terminus of Route HH|
|Jefferson||Grubville||14.491||23.321||Route Y south||Northern terminus of Route Y|
|||20.817||33.502||Route NN north / Route B south – Hillsboro||Southern terminus of Route NN; northern terminus of Route B|
|Byrnes Mill||27.465||44.201||Route W north / Route MM east – Eureka, House Springs||Southern terminus of Route W; northern terminus of Route MM|
|High Ridge||31.421||50.567||Route PP north||Southern terminus of Route PP|
|St. Louis||Fenton||38.132||61.368||Route 141 – Fenton, Valley Park||Interchange|
|Sunset Hills||40.842||65.729||I-270||Exit 3 on I-270|
|41.787||67.250||US 50 / US 61 / US 67 ( Lindbergh Boulevard)|
|Affton||44.898||72.256||Route 21 south (Tesson Ferry Road)||Northern terminus of Route 21|
|45.251||72.824||Route P north (Mackenzie Road)||Southern terminus of Route P|
|City of St. Louis||49.976||80.429||Route 366 / Historic US 66 west (Chippewa Street)||Western terminus of concurrency with Historic US 66; no left turns|
|52.085||83.823||Jefferson Avenue||No left turns|
|52.651||84.734||I-55 south – Memphis||Exit 207A on I-55|
|52.718||84.841||I-44 east / I-55 north||Eastern terminus; exit 290C on I-44|
|52.718||84.841||Historic US 66 east (Tucker Boulevard)||Eastern terminus of concurrency with US 66;|
continuation beyond I-44 / I-55
|1.000 mi = 1.609 km; 1.000 km = 0.621 mi|