List of Interstate Highways in Colorado

Interstate Highways in Colorado
Standard highway markers for Interstate 70, Interstate 225, and Interstate 76 Business
Highway names
InterstatesInterstate X (I-X)
Business routes:Interstate X Business (I-X Bus.)
System links
Colorado State Highways

Mainline highways
Number Length (mi) Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes
I-25 305.04490.91 I-25 at the New Mexico state lineI-25 at the Wyoming state line 01958-01-011958current
I-70 449.51723.42 I-70 at the Utah state lineI-70 at the Kansas state line 01956-01-011956current
I-76 183.99296.10 I-70 in ArvadaI-76 at the Nebraska state line 01976-01-011976current
I-80S 178.22286.82 I-25/US 87 in North WashingtonI-80S at the Nebraska state line 01958-01-01195801976-01-011976 Renumbered as I-76 to conform to AASHTO policy against suffixed routes
I-225 11.9919.30 I-25 in DenverI-70 in Aurora and Denver 01976-01-011976current
I-270 5.358.61 I-25/US 36 in unincorporated Adams CountyI-70 in Denver 01965-01-011965current
I-425 5.358.61 I-25/US 36 in unincorporated Adams CountyI-70 in Denver —01959-01-011959 Original designation for I-270
I-470 —— Beltway around Denver 01968-01-011968— Proposed, but cancelled due to environmental concerns
  •       Former

Business routes
Number Length (mi) Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes
I-25 BL 0.50.8 Trinidad —02009-01-012009 A 2009 reconstruction project along I-25 rebuilt the northern terminus and eliminated the original exit which removed the route.[1]
I-25 BS 1.943.12 Aguilar ——
I-25 BL 3.946.34 Walsenburg ——
I-25 BL 6.7510.86 Colorado Springs —02007-01-012007
I-25 BL 1.21.9 Castle Rock —01996-01-011996 Likely unsigned[2]
I-70 BL 13.3621.50 Grand JunctionClifton ——
I-70 BL 3.76.0 Palisade ——
I-70 BL 4.06.4 Rifle —02004-01-012004
I-70 BL 0.170.27 Silt —— Unsigned
I-70 BL 0.270.43 Eagle —— Unsigned
I-70 BL 0.520.84 Edwards —— Unsigned
I-70 BL 0.430.69 Avon —01999-01-011999
I-70 BL 2.33.7 Frisco ——
I-70 BL 2.544.09 Idaho Springs ——
I-70 BL 26.8043.13 West Pleasant ViewAurora —— Also serves Lakewood and Denver
I-70 BL 0.310.50 Watkins —— Only signed along I-70[3]
I-70 BL 0.300.48 Strasburg —— Unsigned
I-70 BL 0.310.50 Deer Trail —— Unsigned
I-70 BL 0.300.48 Agate —— Unsigned
I-70 BL 2.804.51 Limon ——
I-70 BL 0.510.82 Vona —— Unsigned
I-70 BL 1.802.90 Burlington —— Only signed along I-70
I-76 BL 0.300.48 Keenesburg —— Unsigned
I-76 BL 52.3184.18 Fort MorganSterling —— Also serves Brush, Hillrose, Merino, and Atwood
  •       Former

See also
  •  Colorado portal
  •  U.S. Roads portal

References
  1. https://www.interstate-guide.com/business/ir-025/
  2. https://www.interstate-guide.com/business/ir-025/
  3. https://www.interstate-guide.com/business/ir-070/
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