Interstate 25 in Wyoming

Interstate 25
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Route information
	Maintained by WYDOT
Length:	300.53 mi (483.66 km)
Major junctions
South end:	I-25 / US 87 at the Colorado state line near Cheyenne
	<templatestyles src="Plainlist/styles.css"/> I-80 in Cheyenne; US 30 in Cheyenne; US 85 near Cheyenne; US 20 / US 26 in Casper; US 16 in Buffalo;
North end:	I-90 / US 87 near Buffalo
Location
Counties:	Laramie, Platte, Converse, Natrona, Johnson
Highway system

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.

Route description

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..^[1]

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.^[1]

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.^[1]

Wheatland to Casper

File:I25 over North Platte River Douglas.jpg

I-25 bridge over the North Platte River at Douglas

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.^[1]

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.^[1]

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.^[1]

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.^[1]

Exit list

County	Location	mi^[1]	km	Exit	Destinations	Notes
Laramie		0.000	0.000		I-25 / US 87 south – Denver	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	10D	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
	Ranchettes	17.236	27.739	17	US 85 north – Torrington	No southbound exit; north end of concurrency with US 85
		21.318	34.308	21	Ridley Road
		25.452	40.961	25	Exit 25
		29.512	47.495	29	Whitaker Road
		34.440	55.426	34	Nimmo Road
		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)
		66.200	106.539	66	Hunton Road
		68.454	110.166	68	Antelope Road
		70.621	113.653	70	Bordeaux Road
		73.025	117.522	73	WYO 34 west – Laramie
	Wheatland	78.600	126.494	78	I-25 Bus. / US 87 Bus. north – Wheatland
	Wheatland	80.853	130.120	80	I-25 Bus. / US 87 Bus. south – Wheatland
		84.744	136.382	84	Laramie River Road
		87.505	140.826	87	Johnson 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)
		104.043	167.441	104	Middle Bear
	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
	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)
		150.442	242.113	150	Inez Road
		151.166	243.278	151	Ayres Natural Bridge
		154.237	248.220	154	Barber Road
		156.178	251.344	156	Bixby Road
		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
		186.452– 186.785	300.065– 300.601	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.
		187.527	301.795	187	McKinley Street
		188.185– 188.340	302.854– 303.104	188A	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)
		216.605	348.592	216	Ranch Road
		223.780	360.139	223	Exit 223
		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
		265.476	427.242	265	Reno Road
		280.177	450.901	280	Middle Fork Road
		291.077	468.443	291	Trabing Road
	Buffalo	298.024	479.623	298	I-25 Bus. / US 87 Bus. north
	Buffalo	299.321	481.710	299	I-90 Bus. / US 16 – Buffalo
		300.530	483.656	300	I-90 east – Gillette	Northbound exit and southbound entrance; I-90 exit 56B
		300.530	483.656		I-90 west / US 87 north – Sheridan	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 Concurrency terminus Incomplete access