Interstate 25 in Wyoming
|Maintained by WYDOT|
|Length:||300.53 mi (483.66 km)|
|South end:||I‑25 / US 87 at the Colorado state line near Cheyenne|
|North end:||I-90 / US 87 near Buffalo|
|Counties:||Laramie, Platte, Converse, Natrona, Johnson|
Interstate 25 (I-25) is a part of the Interstate Highway System that runs from Las Cruces, New Mexico, to Buffalo, Wyoming. In Wyoming, the Interstate Highway runs 300.530 miles (483.656 km) from the Colorado state line near Cheyenne north to its national terminus at I-90 near Buffalo. I-25 connects Wyoming's largest city and capital, Cheyenne, with its second largest city, Casper, and the smaller communities of Wheatland, Douglas, and Buffalo. The highway also connects those cities with Denver and Billings via I-90. I-25 runs concurrently with U.S. Route 87 (US 87) for almost its entire course in Wyoming. The highway also has extensive concurrencies with US 20 and US 26 along its east–west segment through the North Platte River valley. The Interstate has business loops through Cheyenne, Chugwater, Wheatland, Douglas, Glenrock, Casper, and Buffalo.
Cheyenne to Wheatland
I-25 enters Laramie County concurrent with US 87 from Weld County, Colorado, southwest of Cheyenne and briefly runs parallel to a BNSF Railway line. The four-lane Interstate has its first interchange, a diamond interchange with Wyoming Highway 223 (WYO 223) (Terry Ranch Road), and crosses over the Union Pacific Railroad's Speer Subdivision rail line and over the BNSF rail line. I-25 meets High Plains Road at a dumbbell interchange, then has a diverging diamond interchange with WYO 212 (College Drive), a junction that serves as the southern end of Interstate 25 Business (I-25 Bus.). The freeway has a cloverleaf interchange with I-80, crosses over the Union Pacific's Laramie Subdivision and US 30 (Lincolnway), and has a four-ramp partial cloverleaf interchange with US 30, which here is also part of I-80 Bus..
I-25 continues north along the western edge of the city of Cheyenne and along the eastern edge of Francis E. Warren Air Force Base, which is served by the next three interchanges. The highway has a five-ramp partial cloverleaf interchange with Missile Drive, crosses over a BNSF rail yard, and has a diamond interchange with Randall Road, which leads to Pershing Boulevard. I-25 reconnects with its business route at Central Avenue, where US 85 joins the Interstate. The freeway has a dumbbell interchange with Vandehei Street before leaving the city of Cheyenne and passing through the unincorporated area of Ranchettes. I-25 has an interchange with WYO 211 (Horse Creek Road) before US 85 splits to the northeast. There is no direct access from southbound I-25 to northbound US 85 at the latter interchange; southbound traffic uses the WYO 211 interchange to turn around to access northbound US 85.
I-25 continues through sparsely populated northern Laramie County, where the Interstate crosses Lodgepole Creek and has five interchanges with minor roads: Ridley Road, an unamed road only marked as Exit 25, Whitaker Road, Nimmo Road, and an unnamed road that serves the Little Bear Community. The Interstate enters Platte County at its interchange with Bear Creek Road. I-25's first population center north of Cheyenne is Chugwater, where the highway crosses over a BNSF rail line and Chugwater Creek, has an interchange with WYO 211 and WYO 313 in town, and has an interchange with WYO 321 (Ty Basin Road) north of town. Those two interchanges serve as the termini for Chugwater's I-25 Bus.. The Interstate meets the western end of WYO 314 (Slater Road) west of Slater; has minor interchanges with Hunton Road, Antelope Road, and Bordeaux Road; and meets the eastern end of WYO 34.
Wheatland to Casper
I-25's next serves the town of Wheatland, the county seat of Platte County. Wheatland's I-25 Bus. splits off onto Mariposa Boulevard and provides access to WYO 310 and WYO 312. The Interstate and business route reconvene at the north end of town. I-25 has minor interchanges with Laramie River Road near its crossing of the Laramie River and with Johnson Road. The Interstate meets US 26 at a directional T interchange at Dwyer Junction, and the U.S. Highway joins I-25 and US 87 heading north. I-25 has minor interchanges with El Rancho Road and an unnamed access road to Middle Bear around a junction with the southern end of WYO 319 (Cassa Road). The Interstate has an interchange with WYO 319 Spur in the town of Glendo, then parallels WYO 319 and the BNSF rail line northwest into Converse County to the west of the Glendo Reservoir, an impoundment of the North Platte River. I-25 crosses over the North Platte River and a BNSF rail line at Orin, where the Interstate has an interchange with and is joined by US 20; this interchange serves as the western terminus of US 18.
I-25, US 87, US 20, and US 26 head west to Douglas, the county seat of Converse County. I-25 Bus. and its companion business routes—US 87 Bus., US 20 Bus., and US 26 Bus.—split northwest from a trumpet interchange into the city while I-25 and the mainline U.S. Highways pass to the south of the city. I-25 crosses over the BNSF rail line and the North Platte River, then curves northwest to meet the business routes at a trumpet interchange on the west side of the city near the business routes' intersection with WYO 59, which leads north to Gillette. I-25 continues west through interchanges with the western end of WYO 96 (La Prele Road), Inez Road, the road south to Ayres Natural Bridge, Barber Road, and Bixby Road. US 87, US 20, and US 26 diverge from I-25 east of Glenrock. I-25 Bus. joins the U.S. Highways in heading northwest toward the town, then reconnects with I-25 via WYO 95 (Deer Creek Road) south of town. I-25 enters Natrona County and has interchanges with WYO 253 (Hat Six Road) and WYO 258 (Wyoming Boulevard), which serves the town of Evansville to the north.
Casper to Buffalo
I-25 briefly parallels US 87, US 20, and US 26 (Yellowstone Highway) and enters the city of Casper at a complex junction—the complexity is explained in the description for I-25 Bus.—where the Interstate crosses over Yellowstone Highway, the three U.S. Highways join I-25, I-25 Bus. splits from the Interstate to serve downtown Casper, and US 87 Bus., US 20 Bus., and US 26 Bus. split from the mainline U.S. Highways on Yellowstone Avenue. I-25, US 87, US 20, and US 26 cross over the BNSF rail line and are paralleled by a pair of frontage roads, F Street to the north and E Street to the south. There are several slip ramps between I-25 and the frontage roads serving the three streets that connect the portion of Casper north of the BNSF rail line to downtown Casper. The first street, which is Bryan Stock Trail north of the Interstate and Beverly Street to the south, is part of the complex junction between the mainline Interstate and U.S. Highways and their business routes. The second street is McKinley Street, and the third street, Center Street, which carries the northmost portion of I-25 Bus. and US 87 Bus. E Street begins from an exit ramp to Center Street as I-25 and F Street cross the North Platte River. West of the river, the freeway has a diamond interchange with WYO 220 (Poplar Street), then curves north and has a diamond interchange with US 20 and US 26, which split west toward Shoshoni and Casper–Natrona County International Airport, and the access road to the Casper Events Center.
I-25 leaves the city of Casper and has an interchange with WYO 254 (Wardwell Road) next to unincorporated Hartrandt and the town of Bar Nunn. The Interstate has an interchange with Ormsby Road in the Homa Hills area on the northern edge of the Casper populated area. I-25 has minor interchanges with Ranch Road and an unnamed road marketed as Exit 223, then connects with the south end of WYO 387, which serves Midwest to the east, before entering Johnson County. The freeway has interchanges with Tisdale Mountain Road and Powder River Road just north of the highway's crossing of the South Fork of the Powder River. I-25 meets the southern end of WYO 196 (TTT Road) and parallels the state highway to Kaycee, where the highway crosses the Middle Fork of the Powder River and has an interchange with WYO 191. North of Kaycee, I-25 crosses the North Fork of the Powder River and has minor interchanges with Reno Road, Middle Fork Road, and Trabing Road and a crossings of two branches of Crazy Woman Creek near the Middle Fork interchange. The final I-25 Bus. and its companion, US 87 Bus., split off to the south of the town of Buffalo, the county seat of Johnson County. East of the town, I-25 has an interchange with US 16, which also carries I-90 Bus.. The Interstate reaches its northern terminus at a directional T interchange with I-90. US 87 continues north along westbound I-90 toward Sheridan and Billings; I-90 also heads east toward Gillette. Buffalo's I-25 Bus. and US 87 Bus. have their northern termini at a partial interchange just west of the I-25–I-90 junction.
|Laramie||0.000||0.000||—||I‑25 / US 87 south – Denver||Southern terminus of I-25 in Wyoming; Colorado state line|
|2.662||4.284||2||WYO 223 east (Terry Ranch Road)|
|4||High Plains Road||Dumbbell interchange|
|Cheyenne||7.857||12.645||7||I-25 Bus. / WYO 212 north (College Drive)||Diverging diamond interchange|
|8.844||14.233||8||I-80 to US 85 – Sidney, Laramie||Split into exits 8B (west) and 8D (east); I-80 exits 359A-C|
|9.140||14.709||9||I-80 Bus. / US 30 (Lincolnway) – Central Business District|
|10.586||17.037||10||Missile Drive – Warren Gate 2||Split into exits 10B (Warren Gate 2) and 10D (Missile Drive) southbound|
|11.239||18.087||11||Randall Avenue, Pershing Boulevard – Warren Gate 1|
|12.697||20.434||12||I-25 Bus. / US 85 south (Central Avenue)||South end of concurrency with US 85|
|13.834||22.264||13||Vandehei Avenue||Dumbbell interchange|
|Ranchettes||16.230||26.120||16||WYO 211 (Horse Creek Road)||Use southbound exit to U-turn for US 85 north|
|17.236||27.739||17||US 85 north – Torrington||No southbound exit; north end of concurrency with US 85|
|39.235||63.143||39||Little Bear Community|
|Platte||47.248||76.038||47||Bear Creek Road|
|Chugwater||54.590||87.854||54||I-25 Bus. north / WYO 211 south / WYO 313 east – Chugwater|
|57.649||92.777||57||I-25 Bus. (Ty Basin Road) / WYO 321 south – Chugwater|
|65.253||105.015||65||WYO 314 east (Slater Road)|
|73.025||117.522||73||WYO 34 west – Laramie|
I-25 Bus. / US 87 Bus. north – Wheatland
I-25 Bus. / US 87 Bus. south – Wheatland
|84.744||136.382||84||Laramie River Road|
|Dwyer Junction||92.371||148.657||92||US 26 east – Guernsey, Torrington||Directional T interchange; south end of concurrency with US 26|
|94.825||152.606||94||El Rancho Road|
|100.125||161.136||100||WYO 319 north (Cassa Road)|
|Glendo||111.675||179.723||111||WYO 319 Spur – Glendo|
|Converse||Orin||126.467||203.529||126||US 18 / US 20 east – Lusk||South end of concurrency with US 20; western terminus of US 18|
|Douglas||135.472||218.021||135||I-25 Bus. north – Douglas|
|140.101||225.471||140||I-25 Bus. south to WYO 59 – Douglas, Gillette|
|146.003||234.969||146||WYO 96 east (La Prele Road)|
|151.166||243.278||151||Ayres Natural Bridge|
|160.871||258.897||160||I-25 Bus. / US 87 north / US 20 / US 26 west – East Glenrock||West end of concurrencies with US 20, US 26, and US 87|
|Glenrock||165.909||267.005||165||I-25 Bus. south / WYO 95 north (Deer Creek Road) – Glenrock, Rolling Hills|
|Natrona||Casper||182.530||293.754||182||WYO 253 (Hat Six Road)|
|185.354||298.298||185||WYO 258 (Wyoming Boulevard) – Evansville|
|186||I-25 Bus. north / US 87 south / US 20 / US 26 east / North Beverly Street, Bryan Stock Trail||South end of concurrencies with US 87, US 20, and US 26; southern terminus of I-25 Bus. and US 87 Bus.|
I-25 Bus. (Center Street) / US 87 Bus. south
|No northbound entrance; northern terminus of I-25 Bus. and US 87 Bus.|
|188.600||303.522||188B||WYO 220 west (Poplar Street)|
|189.507||304.982||189||US 20 / US 26 west – Shoshoni, Airport||North end of concurrency with US 20 and US 26|
|Hartrandt||191.644||308.421||191||WYO 254 south (Wardwell Road)|
|Homa Hills||197.522||317.881||197||Ormsby Road|
|210.412||338.625||210||WYO 259 north (Horse Creek Ranch Road)|
|227.987||366.910||227||WYO 387 north – Midwest, Edgerton|
|Johnson||235.375||378.799||235||Tisdale Mountain Road|
|246.560||396.800||246||Powder River Road|
|249.688||401.834||249||WYO 196 north (TTT Road)|
|Kaycee||254.254||409.182||254||WYO 191 – Kaycee|
|280.177||450.901||280||Middle Fork Road|
I-25 Bus. / US 87 Bus. north
|299.321||481.710||299||I-90 Bus. / US 16 – Buffalo|
|300.530||483.656||300||I-90 / US 87 north – Sheridan, Gillette||Northern terminus of I-25; north end of concurrency with US 87; I-90 exit 56B|
|1.000 mi = 1.609 km; 1.000 km = 0.621 mi
I-25 has seven Interstate business loops in Wyoming:
- Interstate 25 Business (Cheyenne, Wyoming) runs 7.490 miles (12.054 km) through Cheyenne in central Laramie County. I-25 Bus. begins at I-25 Exit 7 southwest of Cheyenne. The business route heads east along College Drive concurrent with WYO 212. The two highways continue into the community of South Greeley, where I-25 Bus. leaves WYO 212 and turns north onto US 85 (Greeley Highway). The two highways enter the city of Cheyenne just south of their diamond interchange with I-80, where the highway also becomes part of I-180. This at-grade Interstate Highway has intersections with Fifth Street and Ninth Street, then the two directions diverge slightly as they cross over a Union Pacific Railroad rail yard. I-180 ends at I-80 Bus. and US 30 (Lincolnway) in downtown Cheyenne. I-25 Bus. and US 85 continue along a one-way pair, Warren Avenue northbound and Central Avenue southbound, that passes the Wyoming State Capitol and the Wyoming State Museum. The highway comes back together as Central Avenue north of Eighth Avenue and curves northwest as it passes between Cheyenne Regional Airport and Cheyenne Botanic Gardens, then Yellowstone Road splits to the north. I-25 Bus. reaches its northern terminus at I-25 Exit 12; US 85 joins I-25 heading north and Central Avenue continues west onto Francis E. Warren Air Force Base.
- Interstate 25 Business (Chugwater, Wyoming) runs 3.341 miles (5.377 km) through Chugwater in southern Platte County. I-25 Bus. heads east from I-25 Exit 54, which also serves as the northern terminus of WYO 211 and the western terminus of WYO 313. The business route follows WYO 313 east to First Street, onto which both highways turn north. In the center of town, WYO 313 turns east onto Lone Tree Road and I-25 Bus. continues north with WYO 321. The highway parallels the railroad tracks and I-25 out of town to their concurrent termini at I-25 Exit 57.
- Interstate 25 Business (Wheatland, Wyoming) has a length of 2.960 miles (4.764 km) through Wheatland in central Platte County. The Interstate business loop is coexistent with US 87 Bus. for its entire length. I-25 Bus. begins at I-25 Exit 78 and heads east along Mariposa Parkway, then turns north onto 16th Street. At the intersection of 16th Street and South Street, the business route turns east onto South Street; 16th Street continues north as WYO 310 and South Street continues west as WYO 312. I-25 Bus. follows South Street to Ninth Street, onto which the business route turns north. The highway intersects WYO 316 (Gilchrist Street) in the center of town. At its junction with WYO 320, the business route curves west along Swanson Road to its northern end at I-25 Exit 80.
- Interstate 25 Business (Douglas, Wyoming) runs 4.980 miles (8.015 km) through Douglas in central Converse County. The Interstate business loop is coexistent with US 87 Bus., US 20 Bus., and US 26 Bus. for its entire length. I-25 Bus. begins at I-25 Exit 135 and heads northwest into the city of Douglas along Richards Street. Just east of Richards Street's crossing of the railroad tracks, the business route turns north onto Fourth Street. In the center of town, I-25 Bus. turns west onto Center Street and has an at-grade crossing of the railroad. The business route becomes Yellowstone Highway while passing through an S-curve and crosses the North Platte River. At the western edge of the city, I-25 Bus. meets the southern end of WYO 59 and the northern end of WYO 94. West of that intersection, the business route rejoins I-25 at Exit 140.
- Interstate 25 Business (Glenrock, Wyoming) runs 6.961 miles (11.203 km) through Glenrock in western Converse County. I-25 Bus. begins at I-25 Exit 160 and runs concurrently with US 87, US 20, and US 26 northwest into the town of Glenrock along Birch Street. In the center of town, the U.S. Highways continue west along Birch Street with WYO 95 while I-25 Bus. turns south onto Fourth Street with WYO 95. The two highways leave town and follow Deer Creek Road to their concurrent termini at I-25 Exit 165.
- Interstate 25 Business (Casper, Wyoming) has a length of 2.187 miles (3.520 km) through Casper in central Natrona County. I-25 Bus. begins on a split alignment east of downtown Casper. The northbound business route leaves I-25 at Exit 186 just west of Yellowstone Highway's bridge across I-25 and merges onto F Street, which forms the northbound frontage road along I-25. This portion of F Street includes northbound US 87 and westbound US 20 and US 26. I-25 Bus. turns south onto Bryan Stock Trail; the three U.S. Highways continue straight on F Street then follow a ramp from F street onto I-25. I-25 Bus. crosses over I-25, then meets the eastern end of E Street, which receives southbound US 87 and eastbound US 20 and US 26 via a ramp from I-25 just west of the intersection. Northbound I-25 Bus., southbound US 87, and eastbound US 20 and US 26 continue south along Beverly Street to Yellowstone Highway. At the Beverly Street–Yellowstone Highway intersection, northbound I-25 Bus. turns west onto Yellowstone Highway and the three U.S. Highways turn east onto Yellowstone Highway. Southbound I-25 Bus. heads east from this intersection and reconnects with southbound I-25 at a ramp just west of Yellowstone Highway's bridge across I-25.
- I-25 Bus. heads west from Beverly Street along Yellowstone Highway with US 87 Bus., US 20 Bus., and US 26 Bus.. The business routes veer onto First Street and enter downtown Casper. At the intersection of First Street and Center Street, I-25 Bus. and US 87 Bus. turn north onto Center Street while US 20 Bus. and US 26 Bus. continue west along First Street. I-25 Bus. and US 87 Bus. follow Center Street north to E Street. The southbound business routes begin at this intersection, whose west leg is the Exit 188A ramp from southbound I-25. The northbound business routes pass under I-25, then turn west onto F Street and cross the North Platte River. I-25 Bus. and US 87 Bus. turn south onto Poplar Street, then immediately turn west onto the Exit 188B entrance ramp to northbound I-25, also rejoining US 87, US 20, and US 26. Poplar Street continues south as WYO 220.
- Interstate 25 Business (Buffalo, Wyoming) spans 3.316 miles (5.337 km) through Buffalo in central Johnson County. The Interstate business loop is coexistent with US 87 Bus. for its entire length. I-25 Bus. heads west from I-25 Exit 298 and curves north into the city of Buffalo; within the curve, the highway intersects WYO 196. The business route follows Main Street through the center of town, within which the highway runs concurrently with US 16 between Fort Street and Hart Street. At the northern junction with US 16, I-25 Bus. joins I-90 Bus. north out of the city to their termini at I-90 Exit 56A just west of the I-25–I-90 interchange.