Route 38 (Missouri 1922)

U.S. Route 166
Route information
Auxiliary route of US 66
Length:	164 mi (264 km)
Existed:	1926 – present
Major junctions
West end:	US-81 in South Haven, KS
	I-35 / Kansas Turnpike east of South Haven, KS US-77 in Arkansas City, KS K-15 in eastern Cowley County, KS K-99 south of Sedan, KS US-75 north of Caney US-169 in Coffeyville, KS US-59 in Chetopa, KS US-69 west of Baxter Springs, KS US-69 Alt. in Baxter Springs, KS US-400 east of Baxter Springs, KS
East end:	I-44 / US 400 near Joplin, MO
Location
States:	Kansas, Missouri
Highway system
United States Numbered Highway System List Special Divided Replaced

U.S. Route 166 (US 166) is a 164-mile (264 km) west–east United States highway. This route and US-266 are the only two remaining spurs of historic U.S. Route 66 (which was decommissioned in 1985), since US-666 was renumbered to US-491 in 2003.

US-166 meets the old route of US-66, now designated US-69 Alternate, in Baxter Springs in the southeast corner of Kansas.

US 166 is a west–east highway that meanders about 164 miles (264 km) along the Kansas–Oklahoma state line. The highway's western terminus is in South Haven, Kansas at an intersection with US-81, approximately 1-mile (1.6 km) north of the northern terminus of US-177. US 166's eastern terminus, which is also shared by US Route 400, is an intersection with I-44 just inside the Missouri state line, near the point where Kansas, Oklahoma, and Missouri meet, southwest of Joplin, Missouri near Loma Linda, MO.

About 4 miles (6.4 km) east from its intersection with US-81, the highway intersects with the Kansas Turnpike (I-35) at exit 4. Continuing east about 60 miles (97 km), US-166 crosses the Arkansas River into Arkansas City, where it travels concurrent with US-77 for approximately 2 miles (3.2 km), splitting off near Parkerfield.

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Wikipedia