U.S. Route 166

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U.S. Route 166 marker

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
East end: I-44 / US 400 near Joplin, MO
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.

Route description[edit]

mi km
KS 163.223[1] 262.682
MO 0.6[2] 1.0


US-166's western terminus in South Haven, Kansas
US 166's eastern terminus approaching I-44 in Newton County, Missouri

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.

Traveling 50 miles (80 km) east of Arkansas City, US-166 turns northeast, arcing above Cowley County Lake Dam and Cedar Vale. It dives south of Sedan. However, a business loop connects the main US-166 route with Sedan.

Continuing east from Sedan, about 34 miles (55 km) to Coffeyville, US-166 skims through Peru and Niotaze to an intersection with US-75 near Havana. The two routes turn south for a 3-mile (4.8 km) concurrency. US-166 splits off just north of Caney turning east again through Tyro to Coffeyville. US-166 has a brief concurrency with US-169 in the Coffeyville area.

Eastward about 50 miles (80 km) from Coffeyville to Baxter Springs, US-166 crosses the Verdigris River, bypassing Edna and Bartlett. US-166 passes through Chetopa, where US-166 and US-59 travel concurrent. Leaving Chetopa, US-166 crosses over the Neosho River and crosses US-69 Alternate, 6 miles (9.7 km) before Baxter Springs.

Heading east from Baxter Springs, US-166 crosses the Spring River. Approximately 2 miles (3.2 km) later, US-166 intersects with US-400. US-166/US-400 then turn sharply southeast for 6 miles (9.7 km) to cross the Missouri state line.


US 166's eastern terminus is its intersection with I-44, 0.6 miles (0.97 km) from the state line[2] and about 1,000 feet (300 m) from the point where Kansas, Missouri, and Oklahoma meet.


US 166 is an original 1926 route and originally ran from South Haven to Baxter Springs, Kansas. In 1945, it was extended east through Joplin, Missouri, where it paralleled US 66 to Springfield. This extension absorbed Route 38,[vague] which had been formed in 1922 from Carthage to west of Springfield and realigned to Joplin in about 1930, with the former route becoming Route 38N and soon US 71 Alternate. In 1966, following the completion of the last section of I-44 in Missouri, the east end of US 166 was truncated back from Springfield to its current terminus. Most sections of US 166 between Joplin and Springfield were not upgraded to Interstate Highway standards and were renumbered as I-44 Business Loops, state highways (such as Route 174) or turned over to local or county jurisdiction.

Major intersections[edit]

State County Location mi[1][2] km Destinations Notes
Kansas Sumner South Haven 0.000 0.000 US-81 Western terminus
3.481 5.602 I-35 / Kansas Turnpike Parclo interchange; I-35 exit 4
Cowley Arkansas City 20.540 33.056 US-77
22.993 37.004 US-77
40.883 65.795 K-15
44.833 72.152 K-15
Chautauqua 66.984 107.800
US-166 Bus.
Western terminus of US 166 BUS
71.325 114.786
US-166 Bus. / K-99
Eastern terminus of US 166 BUS
Montgomery 85.579 137.726 US-75 Trumpet interchange
88.577 142.551 US-75
Coffeyville 106.083 170.724 US-169
108.104 173.977 US-169
Labette 120.743 194.317 K-101 Southern terminus of K-101
128.927 207.488 K-134 Southern terminus of K-134
Chetopa 135.054 217.348 US-59
136.548 219.753 US-59
Cherokee 150.694 242.518 US-69
Baxter Springs 156.181 251.349
US-69 Alt.
158.017 254.304 US-400
161.322 259.623 K-26 Southern terminus of K-26
Missouri Newton 0.6 0.97 I-44 I-44 exit 1; eastern terminus of US 166, eastern terminus of US 400
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

Special routes[edit]

Business loops[edit]

City route[edit]

Truck route[edit]

See also[edit]


  1. ^ a b Kansas Department of Transportation. "Pavement Management Information System". Retrieved 2008-09-26. 
  2. ^ a b c Google (2008-09-16). "U.S. Route 166" (Map). Google Maps. Google. Retrieved 2008-09-16. 

External links[edit]

Route map: Bing / Google

KML is from Wikidata
Browse numbered routes
K-163 KS K-167
Route 165 MO Route 168