Interstate 25 (I-25), also known as the Pan-American Freeway, is a major

Interstate Highway The Dwight D. Eisenhower National System of Interstate and Defense Highways, commonly known as the Interstate Highway System, or the Eisenhower Interstate System, is a network of controlled-access highways that forms part of the National Hi ...

in the western

United States The United States of America (USA), also known as the United States (U.S.) or America, is a country primarily located in North America. It is a federal republic of 50 U.S. state, states and a federal capital district, Washington, D.C. The 48 ...

. It is primarily a north–south highway, serving as the main route through

New Mexico New Mexico is a state in the Southwestern United States, Southwestern region of the United States. It is one of the Mountain States of the southern Rocky Mountains, sharing the Four Corners region with Utah, Colorado, and Arizona. It also ...

Colorado Colorado is a U.S. state, state in the Western United States. It is one of the Mountain states, sharing the Four Corners region with Arizona, New Mexico, and Utah. It is also bordered by Wyoming to the north, Nebraska to the northeast, Kansas ...

, and

Wyoming Wyoming ( ) is a landlocked U.S. state, state in the Mountain states, Mountain West subregion of the Western United States, Western United States. It borders Montana to the north and northwest, South Dakota and Nebraska to the east, Idaho t ...

. I-25 stretches from

I-10 Interstate 10 (I-10) is the southernmost transcontinental highway in the Interstate Highway System of the United States. It is the fourth-longest Interstate in the country at , following I-90, I-80, and I-40. It was part of the originall ...

Las Cruces, New Mexico Las Cruces (; ; lit. 'the crosses') is the List of municipalities in New Mexico, second-most populous city in the U.S. state of New Mexico and the county seat, seat of Doña Ana County, New Mexico, Doña Ana County. As of the 2020 United States ce ...

(approximately north of

El Paso, Texas El Paso (; ; or ) is a city in and the county seat of El Paso County, Texas, United States. The 2020 United States census, 2020 population of the city from the United States Census Bureau, U.S. Census Bureau was 678,815, making it the List of ...

) to

I-90 Interstate 90 (I-90) is an east–west transcontinental freeway and the longest Interstate Highway in the United States at . It begins in Seattle, Washington, and travels through the Pacific Northwest, Mountain states, Mountain West, Great Pla ...

Buffalo, Wyoming Buffalo is a city in and the county seat of Johnson County, Wyoming, United States. The population was 4,415 at the 2020 census, down from 4,585 at the 2010 census. The city had experienced an economic boom due to methane production from the C ...

(approximately south of the

Montana Montana ( ) is a landlocked U.S. state, state in the Mountain states, Mountain West subregion of the Western United States. It is bordered by Idaho to the west, North Dakota to the east, South Dakota to the southeast, Wyoming to the south, an ...

–Wyoming border). It passes through or near

Albuquerque, New Mexico Albuquerque ( ; ), also known as ABQ, Burque, the Duke City, and in the past 'the Q', is the List of municipalities in New Mexico, most populous city in the U.S. state of New Mexico, and the county seat of Bernalillo County, New Mexico, Bernal ...

;

Pueblo Pueblo refers to the settlements of the Pueblo peoples, Native American tribes in the Southwestern United States, currently in New Mexico, Arizona, and Texas. The permanent communities, including some of the oldest continually occupied settlement ...

and

Denver Denver ( ) is a List of municipalities in Colorado#Consolidated city and county, consolidated city and county, the List of capitals in the United States, capital and List of municipalities in Colorado, most populous city of the U.S. state of ...

in Colorado; and

Cheyenne The Cheyenne ( ) are an Indigenous people of the Great Plains. The Cheyenne comprise two Native American tribes, the Só'taeo'o or Só'taétaneo'o (more commonly spelled as Suhtai or Sutaio) and the (also spelled Tsitsistas, The term for th ...

and Casper in Wyoming. The I-25 corridor is mainly rural, especially in Wyoming, excluding the

Albuquerque metropolitan area The Albuquerque Metropolitan Statistical Area, sometimes referred to as Tiguex (named after the Southern Tiwa), is a metropolitan area in central New Mexico centered on the city of Albuquerque. The metro comprises four counties: Bernalillo, Sa ...

and the Front Range urban corridor from Pueblo to Cheyenne. The part of I-25 in Colorado passes just east of the

Front Range The Front Range is a mountain range of the Southern Rocky Mountains of North America located in the central portion of the U.S. State of Colorado, and southeastern portion of the U.S. State of Wyoming. It is the first mountain range encounter ...

of the

Rocky Mountains The Rocky Mountains, also known as the Rockies, are a major mountain range and the largest mountain system in North America. The Rocky Mountains stretch in great-circle distance, straight-line distance from the northernmost part of Western Can ...

. That stretch was involved in a large-scale renovation named the Transportation Expansion (T-REX) Project in Denver and the Colorado Springs Metropolitan Interstate Expansion (COSMIX). These projects, and others in New Mexico, were necessary because these stretches of I-25 were originally inadequately designed and constructed (the pavement was deteriorating rapidly) and also because urban areas, like Albuquerque, Colorado Springs, and Denver, 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 New Mexico and Colorado.

Route description

, - , NM , , - , CO , , - , WY , , - , Total ,

New Mexico

I-25 begins at

's exit 144 in Las Cruces, just south of the

New Mexico State University New Mexico State University (NMSU or NM State) is a public, land-grant, research university in Las Cruces, New Mexico, United States. Founded in 1888, it is the state's oldest public institution of higher education, and was the original land-g ...

campus. I-25 runs concurrently with US Route 85 (US 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 US 70. When I-25 reaches

Truth or Consequences ''Truth or Consequences'' is an American game show originally hosted on NBC radio by Ralph Edwards (1940–57) and later on television by Edwards (1950–54), Jack Bailey (1954–56), Bob Barker (1956–75), Steve Dunne (1957–58), Bob Hi ...

, it is parallel to Elephant Butte Lake State Park. From Las Cruces to Santa Fe, I-25 follows the route of the

Camino Real de Tierra Adentro El Camino Real de Tierra Adentro (), also known as the Silver Route, was a Viceroyalty of New Spain, Spanish road between Mexico City and San Juan Pueblo, New Mexico, San Juan Pueblo (''Ohkay Owingeh''), New Mexico (in the modern U.S.), that wa ...

. As I-25 nears

Albuquerque Albuquerque ( ; ), also known as ABQ, Burque, the Duke City, and in the past 'the Q', is the List of municipalities in New Mexico, most populous city in the U.S. state of New Mexico, and the county seat of Bernalillo County, New Mexico, Bernal ...

, it has interchanges with highways, such as US 380, and a concurrency with US 60. Further north, State Road 6 (NM 6), former US 66, meets up with I-25 in

Los Lunas Los Lunas is a village in Valencia County, New Mexico, United States. As of the 2020 census, the village has a population of 17,242. It is the county seat of Valencia County. Los Lunas is part of the Albuquerque Metropolitan Statistical Area. ...

. Through Albuquerque, I-25 is named the Pan American Freeway, and there are frequent exits to city streets. A major interchange with I-40 (which is styled as the Coronado Freeway in the city) is named the

Big I The Big I is a freeway interchange where Interstate 25 and Interstate 40 intersect northeast of downtown Albuquerque, New Mexico. Description The Big I is a complex stack interchange located in central Albuquerque, New Mexico. Th ...

. It was given an honorable mention by the

US Department of Transportation The United States Department of Transportation (USDOT or DOT) is one of the executive departments of the U.S. federal government. It is headed by the secretary of transportation, who reports directly to the president of the United States a ...

and the

Federal Highway Administration The Federal Highway Administration (FHWA) is a division of the United States Department of Transportation that specializes in highway transportation. The agency's major activities are grouped into two programs, the Federal-aid Highway Program a ...

for excellence in urban highway design in 2002. Leaving Albuquerque to the north, I-25 curves to the northeast as it approaches Santa Fe. Continuing 'northbound' at Santa Fe, I-25 heads southeast for approximately traveling through the

Santa Fe National Forest The Santa Fe National Forest is a protected national forest in northern New Mexico in the Southwestern United States. It was established in 1915 and covers . Elevations range from 5,300 feet (1600 m) to 13,103 feet (4000 m) at the su ...

and crossing Glorieta Pass (elevation ). It turns north again at Blanchard toward

Las Vegas Las Vegas, colloquially referred to as Vegas, is the most populous city in the U.S. state of Nevada and the county seat of Clark County. The Las Vegas Valley metropolitan area is the largest within the greater Mojave Desert, and second-l ...

. The highway maintains a north and northeast orientation as it leaves New Mexico traversing

Raton Pass Ratón Pass is a 7,834 ft (2,388 m) elevation mountain pass on the Colorado–New Mexico border in the western United States. It is located on the eastern side of the Sangre de Cristo Mountains between Trinidad, Colorado and Raton, N ...

() and enters Colorado. Due to its elevation and frequent winter snowstorms, I-25 is sometimes impassible and closed in both directions at Raton Pass during winter months. From Santa Fe to

Trinidad, Colorado Trinidad is the List of cities and towns in Colorado#Home rule municipality, home rule municipality that is the county seat of and the List of cities and towns in Colorado, most populous municipality in Las Animas County, Colorado, United Stat ...

, I-25 approximates part of the route of the

Santa Fe Trail The Santa Fe Trail was a 19th-century route through central North America that connected Franklin, Missouri, with Santa Fe, New Mexico. Pioneered in 1821 by William Becknell, who departed from the Boonslick region along the Missouri River, the ...

. For its entire length in the state, I-25 shares its alignment with US 85, although the latter is unsigned.

Colorado

I-25 has many nicknames through the state's larger cities. In

, it is called the Valley Highway, as the highway parallels the course of the

South Platte River The South Platte River is one of the two principal tributaries of the Platte River. Flowing through the U.S. states of Colorado and Nebraska, it is itself a major river of the American Midwestern United States, Midwest and the American Sou ...

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

, it is named the John F. Kennedy Memorial Highway. In the

Federal-Aid Highway Act of 1973 The Federal-Aid Highway Act of 1973 (Public Law 93–87; 87 Stat. 250) is legislation enacted by the United States Congress and signed into law on August 13, 1973, which provided funding for existing interstate and new urban and rural primary an ...

, a transcontinental highway was named after President

Dwight D. Eisenhower Dwight David "Ike" Eisenhower (born David Dwight Eisenhower; October 14, 1890 – March 28, 1969) was the 34th president of the United States, serving from 1953 to 1961. During World War II, he was Supreme Commander of the Allied Expeditionar ...

, in commemoration of the route of the US Army's 1919 convoy. This route, rather than following a single highway, spans several, including I-25 in Denver. This combination of routes was intended to approximate the original 1919 convoy route. The designation of this highway, while clear in intent, has not seen widespread adoption in terms of signage or recognition, likely due to the irregular nature of the route. Despite this, a commemorative sign was installed in 1986 in the tourist information center off

I-70 Interstate 70 (I-70) is a major east–west Interstate Highway in the United States that runs from I-15 near Cove Fort, Utah, to I-695 and Maryland Route 570 (MD 570) in Woodlawn, just outside Baltimore, Maryland. I-70 appr ...

Kansas City, Kansas Kansas City (commonly known as KCK) is the third-most populous city in the U.S. state of Kansas and the county seat of Wyandotte County. It is an inner suburb of the older and more populous Kansas City, Missouri, after which it is named. As ...

. Congress attempted to honor Eisenhower's contributions to the Interstate System once more in 1990, leading to the renaming of the Interstate System as the "Dwight D. Eisenhower System of Interstate and Defense Highways". I-25 enters

south of the city of

Trinidad Trinidad is the larger, more populous island of the Republic of Trinidad and Tobago, the country. The island lies off the northeastern coast of Venezuela and sits on the continental shelf of South America. It is the southernmost island in ...

. It is the main north–south route through Colorado with a length of . The Interstate exits Colorado in the north about south of

Cheyenne, Wyoming Cheyenne ( or ) is the List of capitals in the United States, capital and List of municipalities in Wyoming, most populous city of the U.S. state of Wyoming. It is the county seat of Laramie County, Wyoming, Laramie County, with 65,132 reside ...

. I-25 serves all the major cities in Colorado that are east of the

, such as Denver,

Colorado Springs Colorado Springs is the most populous city in El Paso County, Colorado, United States, and its county seat. The city had a population of 478,961 at the 2020 census, a 15.02% increase since 2010. Colorado Springs is the second-most populous c ...

, Pueblo,

Fort Collins A fortification (also called a fort, fortress, fastness, or stronghold) is a military construction designed for the defense of territories in warfare, and is used to establish rule in a region during peacetime. The term is derived from La ...

, 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 Space Force Base Buckley Space Force Base is a United States Space Force base in Aurora, Colorado named after United States Army Air Service First lieutenant, First Lieutenant John Harold Buckley. The base is run by Space Base Delta 2, with major units includin ...

, the

Cheyenne Mountain Complex The Cheyenne Mountain Complex is a United States Space Force installation and defensive bunker located in unincorporated El Paso County, Colorado, next to the city of Colorado Springs, at the Cheyenne Mountain Space Force Station, which host ...

headquarters of

NORAD North American Aerospace Defense Command (NORAD ; , CDAAN), known until March 1981 as the North American Air Defense Command, is a combined organization of the United States and Canada that provides aerospace warning, air sovereignty, and pr ...

Fort Carson Fort Carson is a United States Army post located directly south of Colorado Springs in El Paso County, Colorado, El Paso, Pueblo County, Colorado, Pueblo, Fremont County, Colorado, Fremont, and Huerfano County, Colorado, Huerfano counties, Color ...

Peterson Space Force Base Peterson Space Force Base, previously Peterson Air Force Base, Peterson Field, and Army Air Base, Colorado Springs, is a United States Space Force base that shares an airfield with the adjacent Colorado Springs Municipal Airport and is home to ...

, and the

United States Air Force Academy The United States Air Force Academy (USAFA) is a United States service academies, United States service academy in Air Force Academy, Colorado, Air Force Academy Colorado, immediately north of Colorado Springs, Colorado, Colorado Springs. I ...

. I-25 crosses the

Palmer Divide Named after Colorado Springs founder William Jackson Palmer, the Palmer Divide is a caprock escarpment-style ridge in central Colorado that separates the Arkansas River basin from the South Platte basin. It extends from the Front Range of the ...

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 Pueblo County ( or ) is a county located in the U.S. state of Colorado. As of the 2020 census, the population was 168,162. The county seat is Pueblo. The county was named for the historic city of Pueblo which took its name from the Spanish la ...

and the

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 The Arkansas River Valley, also known as the Arkansas Valley, is a region in Arkansas defined by the Arkansas River in the western part of the state. Generally defined as the area between the The Ozarks, Ozark and Ouachita Mountains, the River V ...

Wyoming

I-25 enters Wyoming south of the state capital,

. After traveling through Cheyenne, I-25 continues north to

Douglas Douglas may refer to: People * Douglas (given name) * Douglas (surname) Animals * Douglas (parrot), macaw that starred as the parrot ''Rosalinda'' in Pippi Longstocking * Douglas the camel, a camel in the Confederate Army in the American Civil ...

, 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, where it ends at an interchange with

. I-90 then provides the connection to

History

The section in New Mexico between Romeroville and

closely follows the original alignment of US 66, which was later shortened and realigned to run due west from Santa Rosa. Now, that has been replaced with I-40.

Junction list

;New Mexico : on the Las Cruces– University Park line. I-25/US 85 share an unsigned concurrency to

Fountain, Colorado The City of Fountain is a List of municipalities in Colorado#Home rule municipality, home rule municipality located in El Paso County, Colorado, El Paso County, Colorado, United States. The population was 29,802 at the 2020 United States census ...

. : in Las Cruces : west of

San Antonio San Antonio ( ; Spanish for " Saint Anthony") is a city in the U.S. state of Texas and the most populous city in Greater San Antonio. San Antonio is the third-largest metropolitan area in Texas and the 24th-largest metropolitan area in the ...

: in Socorro. The highways travel concurrently to south-southwest of Abeytas. : in

: in Bernalillo : south of Santa Fe. I-25/US 84 travels concurrently to Romeroville. I-25/US 285 travels concurrently to Eldorado at Santa Fe. These are

wrong-way concurrencies Wrong way may refer to: * a traffic sign to warn of wrong-way driving * nickname of Douglas Corrigan (1907–1995), an American aviator who flew east from New York to Ireland instead of west to California in 1938 * nickname of Roy Riegels (1908–1 ...

; driving east, one is on I-25 North and US 84 and 285 South. : south of Raton. The highways travel concurrently to Raton. : in Raton. I-25/US 87 travels concurrently to southeast of

Glenrock, Wyoming Glenrock is a town in Converse County, Wyoming, United States. The population was 2,420 at the 2020 census. History Glenrock, known as Deer Creek Station, had its beginning as a mail and stage station along the Oregon Trail. The station served ...

. ;Colorado : in

. The highways travel concurrently to

Walsenburg Walsenburg is the statutory city that is the county seat of and the most populous municipality in Huerfano County, Colorado, United States. The city population was 3,049 at the 2020 census, down from 3,068 in 2010. History Walsenburg was or ...

. : in

. The highways travel concurrently through Pueblo. : in

. The highways travel concurrently through Colorado Springs. : in Colorado Springs : in Colorado Springs. The highways travel concurrently to Castle Rock. : in

: in Denver : in Denver. The highways travel concurrently through Denver. : in Denver. The highways travel concurrently through Denver. : in Denver : in Denver : southeast of Twin Lakes : on the Twin Lakes– Sherrelwood– Welby line : in Loveland ;Wyoming : south-southwest of

: southwest of Cheyenne : in Cheyenne. The highways travel concurrently to Ranchettes. : west-southwest of Dwyer Junction. The highways travel concurrently to southeast of Glenrock. : in Orin. I-25/US 20 travels concurrently to southeast of Glenrock. : in Casper. I-25/US 20/US 26 travels concurrently to the Casper–Bar Nunn city line. I-25/US 87 travels concurrently to north-northeast of Buffalo. : in Buffalo : north-northeast of Buffalo

References

External links

*
Interstate 25 by Matthew Salek
{{Authority control 25 025 Transportation in Colorado Transportation in New Mexico 25 25