Missouri Route 366

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Route 366

Route 366 highlighted in red
Route information
Maintained by MoDOT
Length12.000 mi[1] (19.312 km)
Major junctions
West end I-44 / I-270 / US 50 in Sunset Hills
Major intersections US 50 / US 61 / US 67 in Sunset Hills
East endBroadway / Chippewa in St. Louis
CountryUnited States
CountiesSt. Louis, St. Louis City
Highway system
Route 364 Route 367

Route 366 is a highway located completely within the St. Louis metropolitan area. It is primarily a former section of U.S. Route 66. Beginning at South Broadway/South Jefferson Avenue in St. Louis and ending at the Interstate 44/Interstate 270 interchange in Sunset Hills, it was established in 1979 when US 66 was decertified between Chicago, Illinois and Joplin, Missouri.

Through the several suburbs of St. Louis it is known as Watson Road, while in the city of St. Louis itself, it is named Chippewa Street.


Route 366 in St. Louis, intersecting Gravois Avenue

For 20 years, Route 366 was the only non-Interstate route in the City of St. Louis maintained by the State of Missouri. It officially extended eastward only to Brannon Avenue, two blocks west of South Kingshighway Boulevard.

In 1999, the Route 366 designation was extended east several miles, to include the remaining section of Chippewa Street that was previously part of United States Route 66 (from Chippewa to Gravois, where U.S. Route 66 had historically turned northeastward toward downtown St. Louis), as well as the section east of Gravois as far as South Broadway/South Jefferson Avenue which had never been part of U.S. Route 66.

Major intersections

St. LouisSunset Hills0.000–

I-44 west / US 50 west / I-270 – Tulsa, OK, Chicago, IL, Memphis, TN
Western terminus; exit 277A on I-44; exit 5A on I-270
1.3682.202 US 50 / US 61 / US 67 (Lindbergh Boulevard)Interchange
Route P south (Mackenzie Road)
Northern terminus of Route P
City of St. Louis7.06811.375River Des Peres Boulevard – MetroLinkInterchange
9.43915.191Kingshighway Boulevard
10.40416.744 Route 30 (Gravois Road)
12.00019.312Broadway / Chippewa Street eastEastern terminus; Chippewa Street continues east
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


  1. ^ a b Missouri Department of Transportation (October 23, 2013). MoDOT HPMAPS (Map). Missouri Department of Transportation. Retrieved October 23, 2013.