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Interstate 25

Interstate 25 marker

Interstate 25
Route information
Length: 1,062.77 mi[1] (1,710.36 km)
Major junctions
South end: I‑10 / US 85 / US 180 near Las Cruces, New Mexico

I‑40 in Albuquerque, New Mexico
I‑70 in Denver, Colorado
I‑76 in North Washington, Colorado

I‑80 in Cheyenne, Wyoming
North end: I‑90 / US 87 in Buffalo, Wyoming
Highway system

Interstate 25 (I-25) is an Interstate Highway in the western United States. It is primarily a north–south highway. I-25 stretches from Interstate 10 at Las Cruces, New Mexico (approximately 25 miles (40 km) north of El Paso, Texas), to Interstate 90 in Buffalo, Wyoming (approximately 60 miles (97 km) south of the Montana/Wyoming border).[2]

Interstate 25 is the main north–south expressway through Wyoming, Colorado, and New Mexico. From north to south, it passes through or near Casper, Wyoming; Cheyenne, Wyoming; Fort Collins, Colorado; Denver, Colorado; Colorado Springs, Colorado; Pueblo, Colorado; Raton, New Mexico; Las Vegas, New Mexico; Santa Fe, New Mexico; Albuquerque, New Mexico; Socorro, New Mexico; Truth or Consequences, New Mexico and Las Cruces, New Mexico. The I-25 corridor is mainly rural, especially in Wyoming, excluding the Albuquerque, Pueblo, Colorado Springs, and the Denver areas. The part of I-25 in Colorado passes just east of the Front Range of the Rocky Mountains. That stretch was recently involved in a large-scale renovation named the T-REX[3] (TRansportation EXpansion) in Denver, and the COSMIX[4] (Colorado Springs Metropolitan Interstate Expansion). These projects and others in New Mexico were necessary because these stretches of I-25 were inadequately designed and constructed originally (the pavement was deteriorating rapidly), and also because urban areas like Denver, Colorado Springs, and Albuquerque had tripled and quadrupled in population much earlier than anyone had anticipated back in the 1950s and 1960s. Major highway work for the T-REX project ended on August 22, 2006. The COSMIX project was completed in December 2007. Several other smaller improvement projects for I-25 are still ongoing within Colorado and New Mexico.


  • Route description 1
    • New Mexico 1.1
    • Colorado 1.2
    • Wyoming 1.3
  • History 2
  • Major intersections 3
    • New Mexico 3.1
    • Colorado 3.2
    • Wyoming 3.3
  • Exit list 4
    • Wyoming 4.1
  • Auxiliary routes 5
  • References 6
  • External links 7

Route description

  mi[1] km
NM 462.12 744.15
CO 305.04 490.91
WY 300.95 484.62
Total 1,068.11 1,719.68

New Mexico

Interstate 25 begins at Interstate 10's exit 144 in Las Cruces, just south of the New Mexico State University campus.[5] I-25 is concurrent with U.S. Route 85 at this point, and carries this concurrency for the entire length of its run in New Mexico. Immediately, three exits provide access to the city, including one for U.S. Route 70.[6] When I-25 reaches Truth or Consequences, it is parallel to Elephant Butte Lake State Park.[7] From Las Cruces to Santa Fe I-25 follows the route of El Camino Real de Tierra Adentro.[8]

As I-25 nears Albuquerque, it has interchanges with highways such as U.S. Route 380 and a concurrency with US 60.[9] Further north, State Road 6, former U.S. Route 66, meets up with I-25 in Los Lunas.[10] Through Albuquerque I-25 is named the Pan American Freeway and there are frequent exits to city streets.[11][12]:248 A major interchange with Interstate 40 (which is styled as the Coronado Freeway in the city) is named the Big I.[12]:248[13] It was given an honorable mention by the United States Department of Transportation and the Federal Highway Administration for excellence in urban highway design in 2002.[14]

Leaving Albuquerque to the north, I-25 curves to the northeast as it approaches Santa Fe.[15] Continuing 'northbound' at Santa Fe, I-25 heads southeast for approximately 45 miles (72 km) traveling through the Santa Fe National Forest and crossing Glorieta Pass (elevation 7,452 feet (2,271 m)).[16] It turns north again at Blanchard toward Las Vegas.[17] The highway maintains a north and northeast orientation as it leaves New Mexico traversing Raton Pass (7,798 feet (2,377 m)[18]) and enters Colorado. From Santa Fe to Trinidad, Colorado I-25 approximates part of the route of the Santa Fe Trail.[19] For its entire length in the state, I-25 shares its alignment with US-85, although US-85 is unsigned.


Rush hour on I-25 through downtown Denver

Interstate 25 has many nicknames through the state's larger cities. In Denver it is called the Valley Highway, as the highway parallels the course of the South Platte River throughout the downtown area and is often sunken below ground level. The section in El Paso County is named the Ronald Reagan Highway, and through Pueblo it is named the John F. Kennedy Memorial Highway.

John F. Kennedy Memorial Highway in scenic southern Colorado

I-25 enters Colorado 14 miles (23 km) south of the city of Trinidad. It is the main north–south route through Colorado with a length of 300 miles (480 km). The Interstate exits Colorado in the north about 8 miles (13 km) south of Cheyenne, Wyoming. I-25 serves all the major cities in Colorado that are east of the Rocky Mountains, such as Denver, Colorado Springs, Pueblo, Fort Collins, and Greeley. For the entire distance in Colorado, from the north to the south, the Rocky Mountains are clearly visible.

There are also several important military and air bases and institutions along this route, such as Buckley Air Force Base, the Cheyenne Mountain headquarters of NORAD, Fort Carson, Peterson Air Force Base, and the United States Air Force Academy.

I-25 crosses the Palmer Divide between Denver and Colorado Springs, providing some of the highway's most scenic views of the Rocky Mountains and its foothills. Blizzards and high winds on this stretch (particularly over Monument Hill) are notorious for causing traffic problems during the winter months.

The section of I-25 that is between the northern border of Pueblo County, Colorado, and the New Mexico state line is named the "John F. Kennedy Memorial Highway", in honor of President Kennedy's support of water resources development in the Arkansas River Valley.


I-25 bridge over the North Platte River close to Douglas

I-25 enters Wyoming 8 miles (13 km) south of the state capital city, Cheyenne. After traveling through Cheyenne, Interstate 25 continues north to Douglas, Wyoming, passing many plateaus and also railroad tracks. Commonly, very long trains can be seen slowly moving alongside this highway. Around Douglas, this interstate highway curves somewhat to the west toward Casper. Once through Casper, I-25 turns due north, and it goes as far as Buffalo, Wyoming, where it ends at an intersection with Interstate 90. Then, Interstate 90 provides the connection to Montana.


The section between Romeroville, N.M., and Los Lunas, New Mexico, closely follows the original alignment of U.S. Highway 66, which was later shortened and realigned to run due west from Santa Rosa. Now, that has been replaced with Interstate 40.

Major intersections

New Mexico



Exit list


County Location Mile km Exit Destinations Notes
Laramie   0 0 I‑25 / US 87 south Continuation into Colorado
  2 WYO 223 (Terry Ranch Road)
  4 High Plains Road, Wyoming Travel & Tourism Center
  7 I‑25 Bus. north / WYO 212 east – Fox Farm-College, Cheyenne
  8 I‑80Salt Lake City, Lincoln Signed as exits 8A (east) and 8B (west)
Cheyenne 9 I‑80 Bus. / US 30 (Lincolnway) – Laramie, Cheyenne
10 WYO 210 (Happy Jack Road) / Missile Road – Francis E. Warren Air Force Base Signed as exits 10A (WYO 210/Happy Jack Road) and 10B (Missile Road) southbound
11 Randall Avenue
12 I‑25 Bus. south / US 85 south – Cheyenne, Cheyenne Airport South end of US 85 overlap
13 Vandehei Avenue
  16 WYO 211 (Horse Creek Road)
  17 US 85 north – Torrington North end of US 85 overlap; no southbound exit
  21 County Road 220
  25 County Road 224
  29 WYO 219 south / County Road 228
  34 County Road 120
  39 County Road 238
Platte   47 County Road 245
Chugwater 54 I‑25 Bus. north (WYO 211/WYO 313) – Chugwater
  57 I‑25 Bus. south (WYO 321)
  65 WYO 314 – Slater
  66 Hunton Creek Road
  68 Antelope Creek Road
  70 Bordeaux Road
  73 WYO 34 – Bosler
Wheatland 78
US 87 Bus. north – Wheatland
US 87 Bus. south – Wheatland
  84 Laramie River Road
  87 Johnson Road
  92 US 26 east – Torrington South end of US 26 overlap
  94 WYO 319 (El Rancho Road) / Pepper Road
  100 WYO 319 – Glendo No southbound exit
  104 Cassa Road
Glendo 111 A Street – Glendo
Converse Orin 126 US 18 east / US 20 east – Lusk, Black Hills National Forest South end of US 20 overlap
  135 I‑25 Bus. north – Douglas
Douglas 140 I‑25 Bus. south – Douglas
  146 WYO 96
  150 County Road 29
  151 County Road 13
  154 Barber Road
  156 Bixby Road
  160 I‑25 Bus. north / US 20 west / US 26 west – Glenrock North end of US 20/26 overlap
  165 I‑25 Bus. south – Glenrock
Natrona Evansville 182 WYO 253 south / WYO 256 north
185 WYO 258 (SE Wyoming Boulevard)
Casper 186 Bryan Stock Trail No southbound entrance
187 McKinney Street
188A WYO 255 (Center Street) No northbound entrance
188B WYO 220 (Poplar Street)
US 20 Byp. west / US 26 Byp. west – Thermopolis, Riverton, Natrona County International Airport, Yellowstone National Park
Hartrandt 191 WYO 254 (Howard Street)
Homa Hills 197 Ormsby Road/County Road 705 – Homa Hills
  210 WYO 259 – Midwest
  216 Branton Ditch Reservoir
  223 County Road 118
  227 WYO 387 – Midwest
Johnson   235 Mountain Road
  246 To WYO 196
  249 WYO 196 – Kaycee
Kaycee 254 WYO 191 – Kaycee
  265 Reno Road
  280 Middle Fork Road
  291 Buffalo Sussex Cutoff Road
  298 I‑25 Bus. north – Buffalo
Buffalo 299 I‑90 Bus. / US 16 – Buffalo, Gillette
  300 I‑90 / US 87 north – Billings, Rapid City Northern terminus of I-25; north end of US 87 overlap
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

Auxiliary routes


  1. ^ a b "Route Log and Finder List - Interstate System - table 1".  
  2. ^ Google Inc. "overview map of I-25". Google Maps (Map). Cartography by Google, Inc.,32.264485,-106.731215&saddr=I-25+N+%4032.264485,+-106.731215&daddr=44.365526,-106.689005&mra=mi&mrsp=1,0&sz=15&sll=44.365802,-106.681795&sspn=0.013867,0.028925&ie=UTF8&ll=39.300299,-106.303711&spn=15.355455,29.619141&z=5. Retrieved 2008-02-15.
  3. ^ [1]
  4. ^ "COSMIX Project Home Page". Retrieved 2011-11-27. 
  5. ^ Google Inc. "I-25 at I-10". Google Maps (Map). Cartography by Google, Inc.,-106.724453&spn=0.048848,0.080338&z=14&om=1. Retrieved 2007-07-07.
  6. ^ Google Inc. "I-25 in Las Cruces". Google Maps (Map). Cartography by Google, Inc.,-106.729774&spn=0.195271,0.32135&z=12&om=1. Retrieved 2007-07-07.
  7. ^ Google Inc. "I-25 parallels Elephant Butte Lake State Park". Google Maps (Map). Cartography by Google, Inc.,-107.071381&spn=0.772276,1.2854&z=10&om=1. Retrieved 2007-07-07.
  8. ^ Wilkerson, Lyn (2003). American Trails Revisited: Following in the Footsteps of the Western Pioneers. Lincoln, NE: ¡Universe, Inc. p. 154.  
  9. ^ Google Inc. "I-25 near Albuquerque". Google Maps (Map). Cartography by Google, Inc.,-106.438293&spn=1.524928,2.570801&z=9&om=1. Retrieved 2007-07-07.
  10. ^ Google Inc. "I-25 at SR 6". Google Maps (Map). Cartography by Google, Inc.,-106.702652&spn=0.37878,0.6427&z=11&om=1. Retrieved 2007-07-07.
  11. ^ Google Inc. "I-25 exits in Albuquerque". Google Maps (Map). Cartography by Google, Inc.,-106.632442&spn=0.04729,0.080338&z=14&om=1. Retrieved 2007-07-07.
  12. ^ a b Bryan, Howard (1989). Albuquerque Remembered. Albuquerque:  
  13. ^ Google Inc. "I-25 at I-40". Google Maps (Map). Cartography by Google, Inc.,-106.626134&spn=0.023628,0.040169&z=15&om=1. Retrieved 2007-07-07.
  14. ^ "I-25/I-40 System-to-System Interchange". Excellence in highway design. Federal Highway Administration. 2002. Retrieved 2007-07-07. 
  15. ^ Google Inc. "I-25 nearing Santa Fe". Google Maps (Map). Cartography by Google, Inc.,-106.092224&spn=0.752943,1.2854&z=10&om=1. Retrieved 2007-07-07.
  16. ^ "Glorieta Pass". Santa Fe Trail National Scenic Byway. The Santa Fe Trail Scenic Byway Profile. Retrieved 13 February 2013. 
  17. ^ Google Inc. "I-25 near Las Vegas". Google Maps (Map). Cartography by Google, Inc.,-105.157013&spn=0.375557,0.6427&z=11&om=1. Retrieved 2007-07-07.
  18. ^ "Raton Pass". National Historic Landmark summary listing. National Park Service. Retrieved 2007-10-13. 
  19. ^ Glassman, Steve (2008). It Happened on the Santa Fe Trail. Morris Publishing. p. ix.  

External links

  • Interstate 25 by Matthew Salek
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