Missouri Route 366

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Route 366

Length:	13 mi (21 km)
Established:	1979
Decommissioned:	Present
Direction:	East-West
From:	St. Louis
To:	Sunset Hills
Cities on route:	St. Louis Shrewsbury Marlborough Webster Groves Crestwood Kirkwood Sunset Hills

Route 366 is a highway located completely within the St. Louis metropolitan area. It is primarily a former section of U.S. Highway 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 St.

For 20 years, Highway 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 Highway 366 designation was extended east several miles, to include the remaining section of Chippewa St. that was previous part of U.S. Highway 66 (from Chippewa to Gravois, where U.S. Highway 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. Highway 66.

The 1.2 mile segment from South Grand Boulevard to South Broadway/South Jefferson Avenue is approximately the same width and configuration as a residential city street, with four-way stop signs at almost every intersection.