U.S. Route 166
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| 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
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  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 K-66 in Baxter Springs, KS US-400 east of Baxter Springs, KS |
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| East end: |
 I-44 / US 400 near Joplin, MO
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| Location | |
| States: | Kansas, Missouri |
| Highway system | |
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 is an intersection with I-44 just inside the Missouri state line, near the boundary where Kansas, Oklahoma, and Missouri meet, which is shared by Cherokee County, Ottawa County, and Newton County, respectively.
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