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Interstate 90 (I-90) is an east–west transcontinental Interstate Highway across the northern United States, linking Seattle to Boston. The portion in the state of Montana is 552.54 miles (889.23 km) in length, passing through 14 counties in central and southern Montana. It is the longest segment of I-90 within a single state. [2]
Interstate 90 (I-90) is an east–west transcontinental freeway and the longest Interstate Highway in the United States at 3,099.7 miles (4,988.5 km). It begins in Seattle, Washington , and travels through the Pacific Northwest , Mountain West , Great Plains , Midwest , and the Northeast , ending in Boston , Massachusetts.
Together, US 212 and I-90 run east through Billings to the town of Crow Agency between mile markers 434 and 510, a distance of 76 miles (122 km). [2] Within the Crow Indian Reservation, US 212 leaves I-90 and runs east and southeast through the high plains of Montana. It is the main east–west road through the Northern Cheyenne Indian Reservation.
Number Length (mi) [3] Length (km) Southern or western terminus Northern or eastern terminus Formed Removed I-15: 396.03: 637.35 I-15 near Monida: Hwy 4 at Sweetgrass: I-90: 551.68
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.
Montana State Highway 1 (MT 1) is a state highway in Deer Lodge and Granite counties in southwestern Montana, United States, extending west and north from the Anaconda I-90 Junction to Drummond. Both the beginning and endpoints of the road are on Interstate 90 .
I-90 in Opportunity: I-90 in Drummond: 1922: current MT 2: 63.241: 101.777 I-90 in Butte: I-90 in Three Forks — — MT 3 — — Idaho border near Heron: US 93 in Ravalli — — Replaced by US 10 Alt MT 3: 221.770: 356.904 I-90 in Billings: I-15 and US 89 in Great Falls — — MT 4: 24: 39 Idaho state line: MT 3 in Thompson Falls — —
It then overlaps I-90 for 69 miles (111 km), until Garrison, where it heads eastward toward Helena for 48.8 miles (78.5 km). This two-lane section of the trip passes through Avon and Elliston winding through Helena National Forest, over the Continental Divide at MacDonald Pass, and then through Montana's capital city, Helena.