Автомагистраль США 87: От Монтаны до Техаса

Numbered U. S. Highway in the United States

U. S. Highway 87 (US 87) is a north–south United States highway (though it is signed east–west in New Mexico) that runs for 1,998 miles (3,215 km) from northern Montana to southern Texas, making it the longest north south road to not have a "1" in its number and the third longest north south road in the country, behind U. S. 41 and U. S. 1. Most of the portion from Billings, Montana to Raton, New Mexico is co signed along Interstates 90 and 25. It is also co signed along the majority of I 27 in Texas and future plans call for the interstate to be extended along the US 87 corridor. As of 2004, the highway's northern terminus is in Havre, Montana, at US 2 and its southern terminus is in Port Lavaca, Texas, at SH 238.

In Texas, US 87 is a north–south highway that begins near the Gulf Coast in Port Lavaca, Texas and heads north through San Antonio, Lubbock, Amarillo, and Dalhart to the New Mexico border near Texline.

US 87 continues in a northwesterly direction in New Mexico and is signed by NMDOT primarily as an east–west route. It merges with US 64 (and thus the Santa Fe Trail National Scenic Byway) in Clayton, shortly after entering New Mexico. It continues to the northwest until Des Moines, when it takes a more westerly approach to Raton. In Raton, it separates from US 64 and merges with Interstate 25 and US 85, with which it remains concurrent through Raton Pass and into Colorado, though it is unsigned on much of the concurrency.

US 87 remains concurrent with I 25 throughout the state of Colorado, which is a rare occurrence for a US highway to have a concurrency with an Interstate in its entirety within state boundaries. It is unsigned through the entire state.

US 87 remains concurrent with Interstate 25 northward until exit 160 east of Glenrock where it joins US Route 20/US Route 26 from Glenrock to Casper. In Casper it splits from US 20/26 and rejoins I 25 at exit 186. It then remains concurrent with Interstate 25 northward until its terminus with Interstate 90. It then follows I 90 west to exit 44 where it runs up to Sheridan. A portion of US 87 has been washed out for several years along this stretch and "temporary" detour signs are posted directing US 87 traffic along Wyoming Highway 193 through Story. In Sheridan US 87 rejoins Interstate 90 into Montana.

US 87 remains concurrent with Interstate 90 westward until Billings, where it breaks off and heads north. Between Crow Agency and Billings, US 87 and I 90 are merged with US 212. It intersects with (and briefly merges with) US 12 in Roundup and continues north with a slight bend to the northwest until, at Grass Range it takes a sharp turn to the west at an intersection with Montana State Highway 200. US 87 remains concurrent with Montana State Highway 200 until Great Falls. In Lewistown, it merges with US 191 and remains heading generally west. Some ten miles (16 km) out of Lewistown, it breaks with US 191 and merges with Montana State Highway 3, heading generally northwest and merging briefly with US 89 before breaking with all three in Great Falls. US 87 heads northeast then east to Fort Benton and then generally northeast to its terminus with US 2 about two miles (3 km) west of Havre.

US 87 originally ran northwest out of Great Falls, Montana towards the eastern border of Glacier National Park. US 87 ran to the Canadian Border at the Piegan Border Crossing. This was changed in 1934, when US Route 89 was diverted to US 87's routing to Glacier Park. US 87 ended in Great Falls until circa 1945 when it was extended to its current northern terminus in Havre, Montana. U. S. Route 185 was formed in 1926 and extended from US 85 in Cheyenne north to Orin. It became part of a southern extension and realignment of US 87 in 1936.

On March 15, 2022, a bill was signed by President Joe Biden that added the extension of I 27 from its termini in Amarillo and Lubbock, Texas northward to Raton, New Mexico and southward to Laredo, Texas respectively to the Interstate Highway System utilizing the US 87 corridor. The interstate's northern terminus would be at I 25. A bill introduced in 2023 would explicitly designate the extension as I 27 with two auxiliary routes numbered I 227 and I 327. I 227 is proposed to be routed via SH 158 from Sterling City to Midland and SH 349 from Midland to Lamesa; I 327 would utilize US 287 from Dumas to the Oklahoma border. However, after legislation passed through the U. S. Senate in August 2023, I 227 and I 327 were respectively redesignated as I 27W and I 27N, with I 27E replacing the proposed I 27 between Sterling City and Lamesa.

U. S. Highway 187 (decommissioned)
U. S. Highway 287

U. S. Route 87 Business in Cheyenne, Wyoming
U. S. Route 87 Business in Wheatland, Wyoming
U. S. Route 87 Business in Casper, Wyoming
U. S. Route 87 Business in Buffalo, Wyoming
U. S. Route 87 Bypass in Great Falls, Montana