Interstate 25 in Colorado

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Interstate 25 marker U.S. Route 87 marker

Interstate 25 and U.S. Route 87
Route information
Maintained by CDOT
Length 305.040 mi[1] (490.914 km)
Major junctions
South end I-25 / US 85 / US 87 near Trinidad
North end I-25 / US 87 near Wellington
Highway system
Colorado State Highways
US 24 I-25 SH 26
SH 86 US 87 SH 88

In the U.S. state of Colorado, Interstate 25 (I-25) follows the north–south corridor through Colorado Springs and Denver. The highway enters the state from the north near Carr and exits the state near Starkville, the highway also runs through the cities of Fort Collins, Loveland, and Pueblo. The route is concurrent with U.S. Highway 87 through the entire length of the state. I-25 replaced U.S. Highway 87 and most of U.S. Highway 85 for through traffic.

Historical nicknames for this route have included the Valley Highway (through Denver), Monument Valley Highway (through Colorado Springs), and the Pueblo Freeway (through Pueblo). Within El Paso County, the route has been dedicated as the Ronald Reagan Highway;[2][3] in Pueblo County, the route is called John F. Kennedy Memorial Highway.

Interstate 25 is also considered to be part of the unofficial Pan-American Highway.[4]

Route description[edit]

New Mexico state line to Pueblo[edit]

Northbound I-25 between Colorado Springs and Denver.

Following the Santa Fe Trail from New Mexico, Interstate 25 enters Colorado as a typical four-lane Interstate Highway, where its entire route in Colorado lies close to the east side of the Rocky Mountains. The route turns from north to west-northwest as I-25 serves Wootton, after leaving Wootton, I-25 turns back up north and bypasses near the east side of the Trinidad Lake State Park, home of the Trinidad Lake.

Trinidad, a city near the Trinidad Lake, is the first major city that lies along I-25. For the next 30 miles (48 km), I-25 continues north through the rural areas of Colorado until it reaches the small city of Walsenburg, where the business route - I-25 Bus. - junctions with U.S. Highway 160. I-25 then continues in a north-northwest direction until it bypasses the Orlando Reservoir, then turns north from there until it reaches Colorado City; in Colorado City, I-25 interchanges with the east end of the Frontier Pathways Scenic and Historic Byway (SH 165) at exit 74.

After leaving the city, I-25 follows in a north-northeast orientation until it reaches the St. Charles Reservoir just before entering the city of Pueblo, with the first exit within the southern city limits of Pueblo at exit 94.[5] The Arkansas River in Pueblo serves as a feeder to the Lake Pueblo State Park, home of the Pueblo Lake, which is located to the west of the western city limits of Pueblo.[6]

Pueblo to Denver[edit]

a picture of I-25 in Denver
I-25 during rush hour in the largest city I-25 serves, Denver, looking East toward Downtown Denver.

After leaving Pueblo, I-25 continues up north with the Union Pacific Railroad line paralleling closely to the route on the right side after interchanging with Porter Draw at exit 106. By exit 119, the Fountain Creek joins along and travels parallel with I-25, and continues all the way to the Fountain Creek Regional Park in Widefield. I-25 gradually turns from a general north direction to the north-northwest and serves the census-designated place of Buttes at exit 122.

Cheyenne Mountain, as seen from I-25 near Fort Carson. Note the communications antennas at the summit, which are radio antennas for stations broadcasting in Colorado Springs.

As soon as US 85 leaves I-25 at exit 128, I-25 enters the city limits of Fountain. Basically, I-25 serves as the border between the western city limits of Fountain on the east side of I-25 and Fort Carson on the west side. Exit 132 (SH 16) serves the north side of the Fountain Creek Regional Park as well as the entrance to Fort Carson and connects to SH 21 (Powers Boulevard), the eastern bypass for the Colorado Springs metro area. By the time I-25 reaches exit 138, the route crosses into the city limits of Colorado Springs, where the stack interchange with US 24 at exit 139 serves the Evergreen Cemetery and Prospect Lake. I-25 turns west at exit 140, along with the Fountain Creek, where it interchanges with US 85, US 87, and I-25 Bus. I-25 again turns back north by exit 141. Swinging around the west side of downtown Colorado Springs at exit 142,[5] and to the north of the city lies the Colorado College, and is served at exit 143 - Uintah Street. Continuing north and northeast, the highway intersects the north terminus of I-25 Bus. and US 85. The interstate leaves Colorado Springs between exits 153 and 156, where I-25 enters the United States Air Force Academy, going through the east side of the institution.

Map showing I-25 and nearby freeways and major highways in the Denver Metropolitan area

I-25 leaves El Paso County and enters Douglas County at Monument Hill, elevation 7,352 feet, north of Monument. I-25 then continues north through more rural and hilly areas east of the Rocky Mountains until reaching Castle Rock at exit 181. I-25 continues through rural and hilly portions of Douglas County until interchanging with E-470, the partial beltway of Denver as the toll road serves the Centennial Airport and the much larger Denver International Airport.

After entering Arapahoe County, I-25 cuts through the Denver Technological Center (DTC) between Dry Creek Road and Belleview Avenue (exits 196-199). I-25 enters Denver at the I-225 interchange, a spur that detours motorists to I-70 through Aurora, at exit 200. I-25 turns in an westerly direction between Evans Avenue (Exit 203) and Colorado Boulevard (Exit 204). University of Denver lies just to the south of the interstate at Exit 205. It then turns back north after Exit 207. I-25 curves around the west side of downtown Denver,[5] where it can be accessed by I-70 Bus. at exit 210.[5] I-25 then interchanges with I-70 at exit 214 right before leaving the City and County of Denver. [6]

Denver to Wyoming state line[edit]

As I-25 leaves Denver, the route continues up north through unincorporated areas of Adams County and interchanges with I-76, I-270, and the Denver-Boulder Turnpike (US 36). Due to the complexity of this triangle-shaped interchange, it was known to be one of many malfunction junctions throughout the United States. Beyond that interchange, the interstate enters the northern suburbs of the Denver metro area, such as Thornton and Northglenn, and at exit 220, I-25 slips its way through a narrow path between the Badding Reservoir (west side) and the Croke Lake (east side). Development begins to drop off after exit 223 (120th Avenue) after continuing north into Westminster and eastern Broomfield.

At exit 228, I-25 interchanges with the northern termini of E-470 and Northwest Parkway at a stack interchange, with the Larkridge Mall just to the north, served by 160th Avenue (SH 7). As I-25 continues north, it moves through rolling farm and grasslands with the Front Range and high mountains clearly visible to the west while passing through a medley of lakes and reservoirs, it stays generally flat with few moderate climbs in elevation, while also serving smaller cities like Dacono and Firestone to the east and Longmont to the west. This stretch of I-25 in northern Colorado also has large amounts of truck traffic between SH 7 and Wyoming, after some time in the rural farmlands, the interstate enters the Fort Collins/Loveland metro area at exit 255, serving Loveland and Greeley to the east at exits 255 and 257, and continuing north to the Fort Collins city limits south of Harmony Road. The highway runs on the eastern side of Fort Collins, serving Colorado State University at exits 268 and 269 (which is also the most direct route to downtown), after exit 271, I-25 leaves Fort Collins and rolls into more rural grasslands past Wellington. Exits also become few and far between from here to Wyoming as well after gradually turning north-easterly towards the state line.[5][6]


Ancestors and early freeways[edit]

Colorado had begun planning of a modern inter-city route along the Front Range as early as 1944, well before the national movement toward an Interstate Highway system.

State Highway 1, an unpaved road, was completed between Denver and Pueblo by 1919. Average travel time between Pueblo and Colorado Springs on this route was approximately 2.5 hours (or a full 8.5 hours from Pueblo to Denver). This route was upgraded with the help of the federal government to become US 85 and US 87 by 1930, now paved in concrete and shortening the travel time between Pueblo and Colorado Springs to just one hour.

The cities of Denver (in 1948) and Pueblo (in 1949) were first to begin building multi-lane highway segments along the route of what would eventually become Interstate 25. Construction follows an earlier segment of the Colorado and Southern Railway. Denver's segment was originally known as the Valley Highway and was completed by 1958, the city of Colorado Springs followed a similar theme with their Monument Valley Freeway, begun in 1955 and completed by July 1960. Pueblo's section — the Pueblo Freeway - was complete by July 1959.[3]

Interstate completion[edit]

As the national Interstate Highway System began to take shape, actual "inter-state" connections began to be made. Wyoming came first in 1964, building a 9-mile (14 km) link north to Cheyenne that was connected to Colorado's 17-mile (27 km) stretch.

Linking to New Mexico in the south would prove more problematic as the planned route had to stretch over Raton Pass, and its accompanying 1,800-foot (550 m) elevation change, within just 13 miles (21 km). Once again, US 85 and US 87 were used, but it had to be re-graded in places to meet Interstate design guidelines. Construction began in 1960, with a link to the city of Trinidad completed by 1963, the Trinidad Segment (as CDOT now calls the Raton Pass span) was not fully completed until 1968.

The final segment of the Colorado portion of Interstate 25, connecting the cities of Walsenburg and Trinidad, was completed during 1969. This meant that four lanes of high-speed, nonstop freeway were finally open for a full 305 miles (491 km) from New Mexico north to Wyoming.[3][7]

Modern expansion[edit]

As both population and traffic increased in Colorado during the 1990s and 2000s, the Colorado Department of Transportation has planned and completed major improvements for the city corridors along I-25.

T-REX (Denver)[edit]

T-REX Logo

The first of these was Transportation Expansion (T-REX), which widened and expanded nearly 17 miles (27 km) of both I-25 and the I-225 bypass in the Denver Metropolitan Area as well as adding various pedestrian and aesthetic improvements. T-REX was also instrumental in expanding Denver's RTD light rail lines to connect outlying communities beyond the city and county of Denver, adding 19 miles (31 km) of new routes.[7][8]

Starting in early 2004, the T-REX project was completed during 2006 at a cost of US$1.67 billion, under its projected budget and two years ahead of its originally scheduled conclusion. It has been hailed as a "model for other cities to follow" and "ahead of the curve nationally" by federal transportation and transit authorities.[8]

COSMIX (Colorado Springs)[edit]


As T-REX began to wrap up, CDOT's next major effort began with Colorado Springs Metro Interstate Expansion (COSMIX). It could be argued that COSMIX was even more important to Colorado's interests than T-REX had been, since the Colorado Springs corridor of I-25 had seen immense growth over the past four decades, and experienced major choke points all along the 16-mile corridor from Exit 135 (Academy Blvd) in the south to Exit 151 (Briargate Pkwy) in the north. Originally carrying around 8500 vehicles per day in 1960, usage of the former Monument Valley Freeway had grown to an average of 100,000 vehicles per day by 2005.[9]

The major goals of COSMIX, which began in 2005 and was completed a year and four days ahead of schedule at the very end of December 2007, were a general expansion and widening of the corridor to three lanes in each direction throughout the city, as well as the reconstruction of two main interchanges (at Bijou Street near downtown Colorado Springs, and at Rockrimmon Boulevard and North Nevada Avenue in the city's growing north side).[10] Originally estimated at $225 million, on delivery COSMIX cost only $150 million, approximately $20 million of which involved land acquisition costs.

COSMIX was the first funded portion of a larger plan for I-25 improvements as detailed in an Environmental Assessment approved by CDOT and FHWA in 2004. A second phase resulted in the widening of the 12 mile segment from Woodmen Road (exit 149) to Monument (exit 161) to six lanes and addition of auxiliary lanes at busy interchanges, the Air Force Academy interchange (exit 156) was reconfigured to include just one exit, instead of A/B, and features two new roundabouts for North Gate Boulevard. The widening and paving was completed in December 2014.[11]

An EA-recommended improvement not included in COSMIX due to funding limitations was the reconstruction of the I-25 interchange at Cimarron Street (US 24 West). CDOT completed this project in late 2017.


A new "lane balance" project has begun in northern Douglas County (Lone Tree) from Lincoln Avenue to County Line Road, where CDOT will expand the highway to eight lanes to eliminate the current six lane bottleneck from drivers coming from Castle Rock to the south into Denver, this will connect the existing eight lanes from RidgeGate Parkway to the terminus of the previous T-REX project from years earlier at County Line Road.[12]

Toll lanes will be added along I-25 from US 36 (exit 217) to 120th Avenue (exit 223) in the Thornton area starting in October 2013. Two lanes (one north, one south) will be operational for drivers wishing to cut through traffic by paying a toll, similar to the US 36 project, the highway will have to be expanded and reconstructed to add the additional lanes to the six lane configuration currently in place. The project should be complete by October 2015.[13]

There is much controversy surrounding the future of Interstate 25 in northern Colorado (SH 7 in Broomfield to SH 14 in Fort Collins). Suggestions from adding toll lanes to general expansion to six lanes from the two lane bottleneck at SH 66 to SH 14 and adding multi-modal transportation options have been discussed, the future of the highway remains in question as funding is limited, and agreement is limited as well. The I-25 corridor in Weld and Larimer counties is becoming increasingly heavy with traffic, and something will have to be done soon.[14]

The seven mile segment of I-25 through Pueblo also is in need of reconstruction, and the subject is of much controversy in southern Colorado, on the agenda are expanding the now 60-year-old interstate to six lanes, adding additional auxiliary lanes, and improving many interchanges to bring them up to current standards. The road segment from exit 101 (US 50/SH 47) to exit 94 (SH 45/Pueblo Boulevard) is currently the oldest section of I-25 in the state, and has not been upgraded since the 1950s, minus minor alterations and paving, the controversy surrounds the straightening of the highway through the city and the possible removal of several businesses around the downtown area and the historic district.[15]

Exit list[edit]

County Location mi[1] km Exit Destinations Notes
ColoradoNew Mexico line 0.000 0.000 I-25 / US 85 / US 87 south – Albuquerque Continuation into New Mexico
460 Truck weigh station Northbound entrance extends into Colorado; exit number is based on New Mexico mileage
Las Animas 2.134 3.434 2 Wootton
5.597 9.007 6 Gallinas
7.529 12.117 8 Springcreek
11.013 17.724 11 Santa Fe Trail – Starkville
Trinidad 13.000 20.921 13A Van Buren Street
13.311 21.422 13B SH 12 west (Main Street) – Cuchara, La Veta
13.906 22.380 14 Commercial Street
14.859 23.913 15 SH 239 north / US 160 east / Goddard Avenue, Kit Carson Trail South end of US 160 overlap
17.728 28.530 18 El Moro Road
22.906 36.864 23 Hoehne Road
26.858 43.224 27 Ludlow
30.464 49.027 30 Aguilar Road
34.090 54.863 34 Aguilar
Huerfano 40.485 65.154 41 Rugby Road
41.930 67.480 42 Pryor
Walsenburg 49.000 78.858 49 I-25 Bus. north to US 160 west – Walsenburg, Alamosa
50.054 80.554 50 SH 10 east (US 160 west) – La Junta North end of US 160 overlap
52.321 84.202 52 I-25 Bus. south / SH 69 west to US 160 west – Gardner, Westcliffe
55.000 88.514 55 Airport Road
56.000 90.123 56 Redrock Road
58.727 94.512 59 Butte Road
60.084 96.696 60 Huerfano
64.046 103.072 64 Lascar Road
66.749 107.422 67 Apache
Pueblo Colorado City 71.264 114.688 71 Graneros Road
74.367 119.682 74 SH 165 west – Colorado City, Rye, San Isabel
77.267 124.349 77 Abbey Road, Hatchet Ranch Road
83.461 134.317 83 Brantzwell
86.938 139.913 87 Verde Road
87.921 141.495 88 Burnt Mill Road
90.625 145.847 91 Stem Beach
Pueblo 94.769 152.516 94 SH 45 north (Pueblo Boulevard)
95.403 153.536 95 Illinois Avenue Southbound exit only
95.901 154.338 96 Minnequa Avenue, Indiana Avenue Southbound exit to Minnequa Ave., one block north of Indiana Ave.; Northbound exit to and entrance from Indiana Ave.; Southbound entrance from Aqua Ave., one block south of Indiana Ave.
96.673 155.580 97A Central Avenue to Northern Avenue
97.447 156.826 97B Abriendo Avenue
97.691 157.218 98A
US 50 Bus. east – La Junta
98.545 158.593 98B To SH 96 / 1st Street
98.806 159.013 99A To SH 96 / 6th Street Southbound exit and northbound entrance (from Bradford Avenue)
99.334 159.863 99B 13th Street, Santa Fe Avenue
99.950 160.854 100A US 50 east – La Junta, Pueblo Memorial Airport South end of US 50 overlap
100.681 162.030 100B 29th Street
101.389 163.170 101 US 50 west / SH 47 east – Cañon City North end of US 50 overlap
102.160 164.411 102 Eagleridge Boulevard
103.896 167.204 104 Eden
106.075 170.711 106 Porter Draw
108.000 173.809 108 Purcell Boulevard – Pueblo West
110.238 177.411 110 Pinon
114.000 183.465 114 Young Hollow
115.831 186.412 116 County Line Road
El Paso 118.843 191.259 119 Rancho Colorado Boulevard
Fountain 121.459 195.469 122 Pikes Peak International Raceway
123.189 198.253 123 Clear Spring Ranch Exit does not sign this destination
124.564 200.466 125 Ray Nixon Road
127.860 205.771 128 US 85 north – Fountain North end of US 85 overlap
131.653 211.875 132 SH 16 east (Mesa Ridge Parkway) to SH 21 – Fort Carson Gate 20 Signed as exits 132A (SH 16) and 132B (Ft. Carson) southbound
Stratmoor 135.262 217.683 135 Airport Sign.svg South Academy Boulevard – Colorado Springs Airport
Colorado Springs 137.752 221.690 138 Lake Avenue, Circle Drive
138.742 223.284 139 US 24 east (Martin Luther King Jr. Bypass) – Limon South end of US 24 overlap
140 SH 115 south (Nevada Avenue, Tejon Street) – Cañon City
141.139 227.141 141 US 24 west (Cimarron Street) – Manitou Springs, Pikes Peak North end of US 24 overlap
141.849 228.284 142 Bijou Street – Downtown Colorado Springs
142.832 229.866 143 Uintah Street
143.520 230.973 144 Fontanero Street
144.622 232.747 145 Fillmore Street
146.074 235.083 146 Garden of the Gods Road
148 Nevada Avenue (US 85 south), Corporate Drive, Rockrimmon Boulevard South end of US 85 overlap
148.830 239.519 149 Woodmen Road
150.303 241.889 150 North Academy Boulevard
151.660 244.073 151 Briargate Parkway
152.899 246.067 153 To SH 21 (Powers Boulevard) / InterQuest Parkway – Black Forest
Air Force Academy 155.930 250.945 156 North Gate Boulevard – North Entrance Air Force Academy
158.199 254.597 158 Baptist Road
Monument 160.763 258.723 161 SH 105 – Monument, Palmer Lake
El PasoDouglas
county line
163.321 262.840 163 County Line Road – Palmer Lake
Douglas 167.464 269.507 167 Greenland
171.820 276.517 172 Upper Lake Gulch Road Primary backup for Spruce Mountain Road. The road Between Exit 173 and Spruce Mountain Road was Numbered SH 18 until 2001 and is current CR 56.
Larkspur 172.307 277.301 173 Spruce Mountain Road Southbound exit and northbound entrance. Numbered SH 1 Between about 1920 to 1968.
173.791 279.690 174 Tomah Road
Castle Rock 180.808 290.982 181 Plum Creek Parkway
181.853 292.664 182 Wilcox Street, Wolfensberger Road
184.212 296.460 184 US 85 north (Meadows Parkway) / SH 86 east / Founders Parkway North end of US 85 overlap
186.935 300.843 187 Happy Canyon Road
188.486 303.339 188 Castle Pines Parkway
Lone Tree 192.096 309.149 192 RidgeGate Parkway Opened on May 20, 2009[16]
192.990 310.587 193 Lincoln Avenue
194.314 312.718 194 SH 470 west / E-470 east – Grand Junction, Limon E-470 exit 1.
county line
Lone TreeCentennial line 195.130 314.031 195 County Line Road
Arapahoe Centennial 196.141 315.658 196 Dry Creek Road
197.188 317.343 197 SH 88 east (Arapahoe Road) South end of SH 88 overlap
Greenwood Village 198.292 319.120 198 Orchard Road
199.384 320.877 199 SH 88 west (Belleview Avenue) North end of SH 88 overlap
City and County of Denver 200.093 322.018 200 I-225 north to I-70 – Limon, Aurora I-225 exits 0A-B; directional T interchange.
201.578 324.408 201 US 285 south / SH 30 east (Hampden Avenue)
202.640 326.117 202 Yale Avenue
203.537 327.561 203 Evans Avenue
204.037 328.366 204 SH 2 (Colorado Boulevard)
205.057 330.007 205 University Boulevard
205.919 331.395 206 Downing Street, Washington Street, Emerson Street Downing St. not signed southbound
207A Lincoln Street, Broadway Lincoln St. not signed southbound
207B Santa Fe Drive to SH 26 Northbound exit and southbound entrance
US 85 south (Santa Fe Drive) South end of US 85 overlap; southbound exit and northbound entrance
208 SH 26 (Alameda Avenue) Southbound exit and northbound entrance; northbound access is via exit 207B
209.210 336.691 209 US 6 west (6th Avenue) – Lakewood South end of US 6 overlap; signed as exits 209A (east) and 209B (west)
209.479 337.124 209C 8th Avenue
210.310 338.461 210A US 40 / US 287 (Colfax Avenue) – Downtown Denver
210.415 338.630 210B Auraria Parkway Northbound exit and southbound entrance
210.532 338.818 210C 17th Avenue Northbound exit and entrance; southbound access is via exit 211
211.109 339.747 211 23rd Avenue, 20th Avenue 20th Ave. not signed northbound
211.464 340.318 212A-B Speer Boulevard – Downtown Denver Signed as exits 212A (south) and 212B (north)
212.096 341.335 212C 20th Street
I-25 HOV/toll lanes South end of reversible HOV/toll lanes
19th Street Southbound exit and northbound entrance for HOV/toll lanes only
212.769 342.419 213 Park Avenue, West 38th Avenue
214A I-70 (US 6 east/US 85 north) – Limon, Grand Junction North end of US 6/US 85 overlap; locally known as The Mousetrap; I-70 exit 274
213.964 344.342 214B 48th Avenue Southbound exit only
Adams North Washington 215.244 346.402 215 58th Avenue
216.301 348.103 216A I-76 east – Fort Morgan Northbound exit and southbound entrance; I-76 exit 5
Welby 216.397–
216B SH 224 (70th Avenue) / I-76 west – Grand Junction Signed as exit 216 southbound; SH 224 not signed southbound; I-76 exit 5
SH 224 (70th Avenue) Northbound exit and southbound right entrance for HOV/toll lanes only
217.006 349.237 217 I-270 east / US 36 – Limon, Aurora, Westminster, Boulder No access to I-270/US 36 east northbound; southbound signed as exits 217A (west) and 217B (east); I-270 exit 0 to I-25 north.
US 36 west – Boulder Southbound right exit and northbound entrance for HOV/toll lanes only
I-25 HOV/toll lanes North end of reversible HOV/toll lanes
Thornton 218.463 351.582 219 84th Avenue – Federal Heights
219.815 353.758 220 Thornton Parkway
Northglenn 221.027 355.708 221 104th Avenue – Northglenn Former SH 44
223.049 358.963 223 SH 128 west (120th Avenue)
Westminster 225.000 362.102 225 136th Avenue
226.085 363.849 226 144th Avenue
City and County of Broomfield 227.745 366.520 228 E-470 east / Northwest Parkway west – Limon, Broomfield E-470/NW Pkwy. exit 47
229.107 368.712 229 SH 7 – Lafayette, Brighton
Weld 232.094 373.519 232 Dacono, Erie
235.114 378.379 235 SH 52 – Dacono, Frederick, Fort Lupton
240.114 386.426 240 SH 119 west – Firestone, Longmont
243.148 391.309 243 SH 66 – Longmont, Lyons
Mead 245.217 394.639 245 Mead
Johnstown 250.241 402.724 250 SH 56 west – Berthoud
252.261 405.975 252 SH 60 east – Johnstown, Milliken
Larimer 254.216 409.121 254 To SH 60 west – Campion
255.272 410.820 255 SH 402 west – Loveland
Loveland 257.305 414.092 257 US 34 – Greeley, Loveland
259.309 417.317 259 Airport Sign.svg Crossroads Boulevard – Fort Collins-Loveland Airport
262.298 422.128 262 SH 392 – Windsor, Fort Collins
Fort Collins 265.314 426.981 265 Harmony Road
268.475 432.069 268 Prospect Road
269A-B SH 14 – Fort Collins, Ault Signed as exits 269A (east) and 269B (west)
271.373 436.733 271 Mountain Vista Drive
Wellington 277.884 447.211 278 SH 1 south – Wellington
281.338 452.770 281 Owl Canyon Road
287.550 462.767 288 Buckeye Road
Weld 292.583 470.867 293 Carr
305.040 490.914 I-25 / US 87 north – Cheyenne, Casper Continuation into Wyoming
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


  1. ^ a b Colorado Department of Transportation, Highway Data, accessed October 2007: note that not every interval between mileposts is exactly a mile, explaining why more exits than expected are at the exact milepost
  2. ^ Ronald Reagan Presidential Foundation & Library Archived July 25, 2008, at the Wayback Machine.
  3. ^ a b c "Interstate 25". Retrieved 2011-11-27. 
  4. ^ Sierra County Economic Development Organization. "Transportation and Highways". Archived from the original on September 7, 2007. Retrieved February 2008.  Check date values in: |accessdate= (help)
  5. ^ a b c d e The Road Atlas (Map). Rand McNally. 2006. p. 32. 
  6. ^ a b c Google Maps street maps and USGS topographic maps, accessed February 2008 via ACME Mapper
  7. ^ a b Kuennen, Tom, ed. Interstate 50: 50 Years of the Dwight D. Eisenhower National System of Interstate and Defense Highways. 2006: Faircount. pp 118-119. ISBN unavailable.
  8. ^ a b "Metro Denver's multi-modal T-REX takes last step - Metro Denver Economic Development Corporation". Retrieved 2011-11-27. 
  9. ^ Kuennen, Tom, ed. Interstate 50: 50 Years of the Dwight D. Eisenhower National System of Interstate and Defense Highways. 2006: Faircount. pp 118-119. ISBN unavailable.
  10. ^ "Progress of Project". Archived from the original on January 13, 2010. Retrieved 2011-11-27. 
  11. ^
  12. ^ "I-25 Lincoln Avenue to County Line Road Lane Balancing Project Has Begun". 
  13. ^ "Project Overview". 
  14. ^ "North I-25 (Denver to Wyoming)". 
  15. ^ Shanna Lewis. "Expansion Plans for I-25 in Pueblo". 
  16. ^ "RidgeGate Parkway Interchange Brings Traffic Relief to Douglas County" (PDF). Southeast Connections. June 2009. Retrieved 2011-11-27. 

External links[edit]

Route map: Google

KML is from Wikidata

Interstate 25
Previous state:
New Mexico
Colorado Next state:
U.S. Route 87
Previous state:
New Mexico
Colorado Next state: