Highway 85, which is in the U.S. State

U.S. state

A U.S. state is any one of the 50 federated states of the United States of America that share sovereignty with the federal government. Because of this shared sovereignty, an American is a citizen both of the federal entity and of his or her state of domicile. Four states use the official title of...

 of Montana

Montana

Montana is a state in the Western United States. The western third of Montana contains numerous mountain ranges. Smaller, "island ranges" are found in the central third of the state, for a total of 77 named ranges of the Rocky Mountains. This geographical fact is reflected in the state's name,...

, is a north–south route traversing the central Gallatin Valley. The highway's southern terminus, just north of Bozeman Hot Springs and about 7 miles (11.3 km) west of Bozeman

Bozeman, Montana

Bozeman is a city in and the county seat of Gallatin County, Montana, United States, in the southwestern part of the state. The 2010 census put Bozeman's population at 37,280 making it the fourth largest city in the state. It is the principal city of the Bozeman micropolitan area, which consists...

, is a census-designated place

Census-designated place

A census-designated place is a concentration of population identified by the United States Census Bureau for statistical purposes. CDPs are delineated for each decennial census as the statistical counterparts of incorporated places such as cities, towns and villages...

 (CDP) known as "Four Corners

Four Corners, Montana

Four Corners is a census-designated place in Gallatin County, Montana, United States. The population was 1,828 at the 2000 census. It is part of the 'Bozeman Micropolitan Statistical Area'.-Geography:...

." From Four Corners, US 191

U.S. Route 191

U.S. Route 191 is a spur of U.S. Route 91 that has two branches. The southern branch runs for 1,465 miles from Douglas, Arizona on the Mexican border to the southern part of Yellowstone National Park. The northern branch runs for 440 miles from the northern part of Yellowstone National Park to...

 runs east to Bozeman, and south to West Yellowstone

West Yellowstone, Montana

West Yellowstone is a town in Gallatin County, Montana, adjacent to Yellowstone National Park. The population was 1,177 at the 2000 census. The town is served by Yellowstone Airport...

; Montana Highway 84

Montana Highway 84

Highway 84 in the U.S. State of Montana is a route running easterly from the small community of Norris to an intersection with U.S. Route 191 north of Bozeman Hot Springs, a distance of approximately...

 travels west to Norris

Norris, Montana

Norris is a small unincorporated community in northeastern Madison County, Montana, United States, at the intersection of U.S. Route 287 and Montana Highway 84...

; and Highway 85 runs north to Belgrade

Belgrade, Montana

Belgrade is a city in Gallatin County, Montana, United States. The population was 5,728 at the 2000 census.The original townsite of Belgrade was established and filed in the Gallatin County Clerk and Recorder's Office by Thomas B. Quaw, a businessman from the midwest, in July 1881...

. The designated Highway 85 terminates near the southern end of Belgrade, at an interchange with Interstate 90

Interstate 90

Interstate 90 is the longest Interstate Highway in the United States at . It is the northernmost coast-to-coast interstate, and parallels US 20 for the most part. Its western terminus is in Seattle, at Edgar Martinez Drive S. near Safeco Field and CenturyLink Field, and its eastern terminus is in...

.

Before receiving its current designation, Highway 85 was designated as Montana Secondary Highway 291.