U.S. Route 87 in Montana

U.S. Highway 87
US 87 highlighted in red
Route information
Maintained by MDT
Length	444.376 mi[1] (715.154 km)
Existed	1926–present
Major junctions
South end	I-90 / US 87 at the Wyoming state line
Major intersections	US 212 from Crow Agency to Billings I-90 / I-94 in Billings US 12 in Roundup. US 191 from Lewistown to Moore US 89 from Armington to Great Falls
North end	US 2 near Havre
Location
Country	United States
State	Montana
Counties	Big Horn, Yellowstone, Musselshell, Petroleum, Fergus, Judith Basin, Cascade, Chouteau, Hill
Highway system
United States Numbered Highway System List Special Divided Montana Highway System Interstate US State Secondary
← MT 86 → MT 87

U.S. Highway 87 (US 87) is a north-south United States Numbered Highway in the state of Montana. It extends approximately 444.4 miles (715.2 km) from the Wyoming state line north to its terminus at US 2 near Havre.

US 87 enters Montana running concurrently with Interstate 90 (I-90) and travels westward for 45.3 miles (72.9 km) to Crow Agency, where US 212 merges with the route. The three routes continue westward for another 54.6 miles (87.9 km) to Billings, where it intersects with the western terminus of I-94 in suburban Lockwood. US 87 follows the I-90/US 212 concurrency for another 3.3 miles (5.3 km) before it heads north, following Main Street through Billings Heights. US 87 continues north for 51 miles (82 km) and intersects US 12, sharing a 2.1-mile (3.4 km) concurrency through Roundup. US 87 continues north with a slight bend to the northwest for 44.7 miles (71.9 km) until it intersects Montana State Highway 200 (MT 200) near Grass Range and takes a sharp turn west; US 87 remains concurrent with MT 200 until Great Falls. US 87 and MT 200 travel west for 30.6 miles (49.2 km) to Lewistown, where they merge with US 191 and continue heading generally westward. About 14.3 miles (23.0 km) west of Lewistown near Moore, it breaks with US 191 and merges with MT 3, where they head northwest for 64.7 miles (104.1 km) and merge with US 89 near Armington. The four-route concurrency of US 87/US 89/MT 3/MT 200 continues northwest for 22.7 miles (36.5 km) to Great Falls, where US 87 leaves all three and travels north through the city. North of Great Falls, US 87 travels northeast for 37.4 miles (60.2 km) to Fort Benton and a final 70 miles (110 km) to its terminus with US 2, about two miles (3.2 km) west of Havre.^[1]

US 87 originally ran northwest out of Great Falls towards the eastern border of Glacier National Park to the Canadian Border at the Piegan Border Crossing. This was changed in 1934, when US 89 was diverted to US 87's routing north of Great Falls. US 87 ended in Great Falls until c. 1945 when it was extended to its current northern terminus near Havre.^[2]

County	Location	mi[1]	km	Exit	Destinations	Notes
Big Horn	​	0.000	0.000	—	I-90 east / US 87 south – Casper, Rapid City	Continuation into Wyoming; exit numbers follow I-90
		6.309	10.153	549	Aberdeen
		12.181	19.603	544	Wyola
		25.541	41.104	530	S-463 – Lodge Grass
		41.467	66.735	514	Garryowen
		45.347	72.979	510	US 212 east – Little Bighorn Battlefield, Broadus	Southern end of US 212 concurrency
		47.012	75.658	509	Crow Agency
		52.956	85.224	503	Dunmore
	Hardin	58.650	94.388	497	I-90 BL west (Third Street) – Hardin
		60.242	96.950	495	I-90 BL east / MT 47 – Hardin City Center
	​	71.778	115.515	484	Frontage Road – Toluca
		77.541	124.790	478	Fly Creek Road
Yellowstone	​	86.511	139.226	469	Arrow Creek Road
		93.973	151.235	462	Pryor Creek Road
	Billings	99.973	160.891	456	I-94 east – Miles City, Bismarck	I-94 exit 0; western terminus of I-94
		100.842	162.289	455	Johnson Lane – Lockwood
		103.288	166.226	452	I-90 west / US 212 west – Butte	Northern end of I-90 / US 212 concurrency; eastern terminus of I-90 BL; southern end of I-90 Bus. concurrency
		104.552	168.260		I-90 BL (1st Avenue N) – Billings City Center	Northern end of I-90 Bus. concurrency
Musselshell	Camp Three	152.198	244.939		US 12 west – Harlowton	Southern end of US 12 concurrency
	Roundup	154.266	248.267		US 12 east – Forsyth	Northern end of US 12 concurrency
	​	174.686	281.130		S-244 north – Winnett
Petroleum	No major junctions
Fergus	​	198.930	320.147		MT 19 east / MT 200 north – Malta, Jordan	Southern end of MT 200 concurrency; southern terminus of MT 19
	Lewistown	229.517	369.372		US 87 Byp. north (Truck Bypass) to US 191 / S-238 south (1st Avenue) – Great Falls	US 87 Byp. is unsigned; former US 191 Bus.
		232.456	374.102		US 191 north / US 87 Byp. south (Truck Bypass)	Southern end of US 191 concurrency; US 87 Byp. is unsigned
	Eddies Corner	246.791	397.172		US 191 south / MT 3 south – Harlowton	Northern end of US 191 concurrency; southern end of MT 3 concurrency
Judith Basin	​	252.944	407.074		S-239 west – Hobson, Utica
	Moccasin	256.720	413.151		S-426 north
	​	261.737	421.225		S-207 north – Benchland
		268.684	432.405		S-541 south
		274.789	442.230		MT 80 north – Stanford, Fort Benton	MT 80 southern terminus
	Geyser	290.081	466.840		S-551 north – Geyser
	​	300.961	484.350		S-427 south – White Sulphur Springs
Cascade	Armington Junction	311.488	501.291		US 89 south – Monarch, White Sulphur Springs	Southern end of US 89 concurrency
	​	315.091	507.090		S-331 north – Belt
		327.947	527.780		S-227 north / S-228 south – Sand Coulee, Highwood
	Great Falls	330.966	532.638		US 87 Byp. north (57th Street) – Malmstrom AFB
		334.146	537.756		US 89 north / MT 3 west / MT 200 west (10th Avenue S) to I-15	Northern end of US 89 / MT 3 / MT 200 concurrency
		335.893	540.567		River Drive (US 87 Byp. south)
		337.008	542.362		To I-15 / US 89 north / MT 200 west / Northwest Bypass
		337.130	542.558		S-225 north (Bootlegger Trail)
Chouteau	Carter	360.532	580.220		S-564 north
	​	372.817	599.991		S-386 east
		374.400	602.538		S-223 north / MT 80 south – Tiber Dam, Chester, Fort Benton	MT 80 northern terminus
		376.909	606.576		S-387 south – Fort Benton
	Big Sandy	412.379	663.660		S-432 north (Kenilworth Road) / S-236 south (Judith Landing Road)
Hill	Box Elder	423.354	681.322		S-448 east
	​	434.741	699.648		S-334 south – Rocky Boy's Agency
	West Havre	444.376	715.154		US 2 – Shelby, Havre	US 87 northern terminus
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus

The following are special routes of U.S. Route 87 in Montana.

U.S. Highway 87 Bypass
Location	Great Falls
Length	4.994 mi[3] (8.037 km)

U.S. Highway 87 Bypass (US 87 Byp.) exists on the eastern and northern edge of Great Falls. The route begins at 10th Avenue South (US 87/US 89/MT 3/MT 200) west of Malmstrom Air Force Base along 57th Street South and runs south to north. Just south of the intersection with 2nd Avenue North the name of the road changes to 57th Street North. At 10th Avenue North, the street name changes to River Drive North, then curves towards the west as it crosses a bridge over a former Milwaukee Road railroad line. The route heads straight west until after the intersection of North Park Trail where it curves to the northwest. After a railroad crossing and the entrance to Giant Springs State Park and the Lewis and Clark Interpretive Center, the road curves to the southwest, generally following the south bank of the Missouri River. US 87 Byp. ends at US 87 south of the 15th Street Bridge, but River Drive North continues along the Missouri River through Riverside Park.^[4] It is known internally by Montana Department of Transportation as Corridor N-102 (C005205).^[3]

U.S. Highway 87 Bypass
Location	Lewistown
Length	3.253 mi[5] (5.235 km)

U.S. Highway 87 Bypass (US 87 Byp.) in Lewistown, also known as the Truck Bypass, is an unsigned highway follows the northern and western edge of the city. The route begins at Main Street (US 87/MT 200), just east of downtown, and follows 1st Avenue North to Kendall Road (US 191 north), where the roadway turns westward becoming 6th Avenue North and also becomes part of US 191. Just west of Lewistown, the roadway turns southwest and re-joins US 87/MT 200.^[6] US 87 Byp. is unsigned as the majority of the route is signed as part of US 191. It is known internally by Montana Department of Transportation as part of Corridor N-43 (C000043) and N-75 (C000075).^[5]

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U.S. Route 87
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