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U.S. Highways in Colorado
U.S. Highways in Colorado
	Standard highway markers for U.S. Highway 6, U.S. Highway 40 and U.S. Highway 160
	U.S. Highways in Colorado highlighted in red
Highway names
US Highways	U.S. Highway X (US X)
System links
	Colorado State Highway System; Interstate; US; State; Scenic;

The U.S. Highways in Colorado are the segments of the national United States Numbered Highway System that are owned and maintained by the state of Colorado. The longest of these highways is U.S. Highway 160 (US 160), which spans 497.223 miles (800.203 km)^[1] across southern Colorado. The standards and numbering for the system are handled by the American Association of State Highway and Transportation Officials (AASHTO) while the routes in the state are maintained by the Colorado Department of Transportation (CDOT).

Mainline highways


Number	Length (mi)	Length (km)	Southern or western terminus	Northern or eastern terminus	Formed	Removed	Notes
US 6	467.284^[2]	752.021	I-70/US 6/US 50 near Mack	US 6 near Holyoke	01931-01-011931	current
US 24	277.319^[3]	446.302	I-70 near Minturn	US 24 near Burlington	01936-01-011936	current
US 34	259.529^[4]	417.671	US 40 in Granby	US 34 near Wray	01939-01-011939	current
US 36	224.718^[5]	361.649	US 34 at Deer Ridge in Rocky Mountain National Park	US 36 near Idalia	01926-01-011926	current
US 38	—	—	Greeley	US 38 at the Nebraska state line	01926-01-011926	01931-01-011931	Became part of US 6 and US 34
US 40	486.924^[6]	783.628	US 40 west of Dinosaur	US 40 east of Arapahoe	01926-01-011926	current
US 40N	—	—	US 40 in Limon	US 40N at the Kansas state line	01926-01-011926	01935-01-01c. 1935	Became part of US 24
US 40S	—	—	US 40N in Limon	Grand Junction	01926-01-011926	01935-01-01c. 1935	Became parts of US 24 and US 40
US 50	467.583^[7]	752.502	I-70/US 6/US 50 near Grand Junction	US 50/US 400 near Holly	01926-01-011926	current
US 84	27.924^[8]	44.939	US 160 near Pagosa Springs	US 84 near Chromo	01941-01-011941	current
US 85	309.542^[9]	498.160	I-25/US 85/US 87 near Trinidad	US 85 near Eaton	01926-01-011926	current
US 87	298.879^[10]	480.999	I-25/US 85/US 87 near Trinidad	I-25/US 87	01936-01-011936	current	Entirely concurrent with Interstate 25 within the state.
US 138	59.823^[11]	96.276	US 6 near Sterling	US 138 near Julesburg	01926-01-011926	current	Orphan route. Was a spur of US 38 before it became part of US 6.
US 160	497.223^[1]	800.203	US 160 near Teec Nos Pos, Arizona	US 160 near Walsh	01930-01-01c. 1930	current	Original western terminus was Trinidad. Extended via US 85 and US 450 to near Dove Creek in 1934. Rerouted west of Cortez via US 164 in 1970 toward Four Corners Monument.
US 164	40.290^[12]	64.840	US 164 near Four Corners Monument	Cortez	01964-01-011964	01970-01-011970	Became part of US 160 west of Cortez
US 285	263.947^[13]	424.782	US 285 near Antonito	I-25 in Denver	01936-01-011936	current	Originally terminated on Alameda Ave. at US 85/US 87. In 1969, rerouted to terminate at US 40 (Colfax Ave.) in Aurora. Truncated at I-25 in Denver in 1979.
US 287	385.223^[14]	619.956	US 287/US 385 near Campo	US 287 near Virginia Dale	01935-01-011935	current
US 350	72.718^[15]	117.028	US 160 near Walsenburg	US 50 in La Junta	01926-01-01c. 1926^[16]	current
US 385	317.631^[17]	511.178	US 287/US 385 near Campo	US 385 near Julesburg	01958-01-011958	current
US 400	14.814^[7]	23.841	US 50/US 385 in Granada	US 50/US 400 near Coolidge, Kansas	01996-01-011996	current	Entirely concurrent with US 50 within the state
US 450	—	—	US 450 at the Utah state line	US 85/US 87 in Walsenburg	—	01939-01-011939	Now US 491 north of Cortez and US 160 from Cortez to Walsenburg
US 491	69.602^[18]	112.014	US 491 north of Shiprock, New Mexico	US 491 north of Dove Creek	02003-01-012003^[19]	current	Formerly US 666
US 550	130.219^[20]	209.567	US 550 near Durango	US 50 in Montrose	01926-01-011926	current
US 650	—	—	—	—	01927-01-01c. 1927	01936-01-011936	Now SH 291 through Salida and US 285 south of Buena Vista
US 666	69.602^[18]	112.014	US 666 north of Shiprock, New Mexico	US 666 north of Dove Creek	01926-01-01c. 1926	02003-01-012003^[19]	Now US 491
US 789	—	—	New Mexico state line	Wyoming state line	—	—	Proposed, but never commissioned; would have followed (south to north): US 666, US 160, US 550, US 6/US 24, SH 13
Former

Special routes


Number	Length (mi)	Length (km)	Southern or western terminus	Northern or eastern terminus	Formed	Removed	Notes
US 6 Byp.	—	—	—	—	—	—	Served Colorado Junction
US 24 Bus.	—	—	Manitou Springs	Colorado Springs	—	—
US 34 Bus.	—	—	—	—	—	—	Serves Estes Park
US 34 Bus.	—	—	—	—	—	—	Serves Greeley
US 34 Bus.	—	—	—	—	—	—	Served Brush
Temp. US 40	—	—	Steamboat Springs	Kremmling	—	—
US 50 Bus.	—	—	Pueblo	Avondale	—	—
US 50 Bus.	—	—	—	—	—	—	Serves Olathe
US 85 Byp.	—	—	Fountain	Colorado Springs	—	—
US 85 Bus.	—	—	—	—	—	—	Serves Brighton
US 85 Bus.	—	—	—	—	—	—	Serves Fort Lupton
US 85 Bus.	—	—	—	—	—	—	Serves Platteville
US 85 Bus.	—	—	—	—	—	—	Serves Greeley
Temp. US 87	—	—	—	—	—	—	Served Denver
US 160 Bus.	—	—	—	—	—	—	Serves Mancos
US 160 Bus.	—	—	—	—	—	—	Serves Durango
US 160 Bus.	—	—	—	—	—	—	Serves Bayfield
US 350 Byp.	—	—	—	—	—	—	Serves Trinidad
US 550 Bus.	—	—	—	—	—	—	Serves Durango
Former

References

^ ^a ^b "Highway Explorer". CDOT OTIS: Online Transportation Information System. Colorado Department of Transportation. Archived from the original on September 10, 2012. Retrieved September 29, 2017.
^ "Highway 006J between 371.69 and 467.284". Colorado Department of Transportation. Retrieved April 9, 2023.
^ "US 24 inventory form" (PDF). Colorado Department of Transportation. Retrieved April 9, 2023.
^ "Highway 034B between 158.485 and 259.529". Colorado Department of Transportation. Retrieved April 9, 2023.
^ "Highway 036D between 89.21 and 224.718". Colorado Department of Transportation. Retrieved April 9, 2023.
^ "Highway 040H between 386.01 and 486.924". Colorado Department of Transportation. Retrieved April 9, 2023.
^ ^a ^b "Highway 050B between 315.709 and 467.583". Colorado Department of Transportation. Retrieved April 9, 2023.
^ "Highway 084A between 0 and 27.924". Colorado Department of Transportation. Retrieved April 9, 2023.
^ "Highway 085L between 265.849 and 309.542". Colorado Department of Transportation. Retrieved April 9, 2023.
^ "Highway 025A between 0 and 298.879". Colorado Department of Transportation. Retrieved April 9, 2023.
^ "Highway Data Explorer". CDOT OTIS: Online Transportation Information System. Colorado Department of Transportation. Archived from the original on September 10, 2012. Retrieved September 29, 2017.
^ "Highway 160A between 0 and 40.290". Colorado Department of Transportation. Retrieved April 9, 2023.
^ "Highway Explorer". CDOT OTIS: Online Transportation Information System. Colorado Department of Transportation. Archived from the original on September 10, 2012. Retrieved September 29, 2017.
^ "Highway 287C between 282.7 and 385.223". Colorado Department of Transportation. Retrieved April 9, 2023.
^ "Highway Explorer". CDOT OTIS: Online Transportation Information System. Colorado Department of Transportation. Archived from the original on September 10, 2012. Retrieved September 29, 2017.
^ "US 350 Inventory Form" (PDF). Colorado Department of Transportation. Retrieved April 9, 2023.
^ "Highway 385E between 313.849 and 317.631". Colorado Department of Transportation. Retrieved April 9, 2023.
^ ^a ^b "Highway Explorer". CDOT OTIS: Online Transportation Information System. Colorado Department of Transportation. Archived from the original on September 10, 2012. Retrieved September 29, 2017.
^ ^a ^b Linthicum, Leslie (July 31, 2003). "It's Now US 491, Not US 666". Albuquerque Journal. Retrieved September 29, 2017.
^ "Highway 550B between 20.916 and 130.219". Colorado Department of Transportation. Retrieved April 9, 2023.