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 Avenue, 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 Avenue 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 unnamed 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. Route 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
Wyoming Highway 319 Spur (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. Routes 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. Routes 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. Routes 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. Routes 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. Routes and their business routes. The second street is McKinley Street, and the third street is Center Street and 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 terminuses at a partial interchange just west of the I-25/I-90 junction. ==History==