Missouri Route 366

Route 366
Route information
	Maintained by MoDOT
Length	12.000 mi[1] (19.312 km)
Existed	1979 – present
Major junctions
West end	I-44 / I-270 / US 50 in Sunset Hills
	US 50 / US 61 / US 67 in Sunset Hills
East end	Broadway / Chippewa in St. Louis
Location
Counties	St. Louis, St. Louis City
Highway system

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.

History

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

County	Location	mi^[1]	km	Destinations	Notes
St. Louis	Sunset Hills	0.000– 0.827	0.000– 1.331	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
	Sunset Hills	1.368	2.202	US 50 / US 61 / US 67 (Lindbergh Boulevard)	Interchange
	Mackenzie	6.749	10.861	Route P south (Mackenzie Road)	Northern terminus of Route P
City of St. Louis		7.068	11.375	River Des Peres Boulevard – MetroLink	Interchange
		9.439	15.191	Kingshighway Boulevard
		10.404	16.744	Route 30 (Gravois Road)
		12.000	19.312	Broadway / Chippewa Street east	Eastern terminus; Chippewa Street continues east
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

References

Route map:

1 2 Missouri Department of Transportation (October 23, 2013). MoDOT HPMAPS (Map). Missouri Department of Transportation. Retrieved October 23, 2013.

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[MoDOT-1] 1 2 Missouri Department of Transportation (October 23, 2013). MoDOT HPMAPS (Map). Missouri Department of Transportation. Retrieved October 23, 2013.