State Highway 125 is a state highway

State highway

State highway, state road or state route can refer to one of three related concepts, two of them related to a state or provincial government in a country that is divided into states or provinces :#A...

 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 Colorado

Colorado

Colorado is a U.S. state that encompasses much of the Rocky Mountains as well as the northeastern portion of the Colorado Plateau and the western edge of the Great Plains...

. The highway runs north–south through Jackson

Jackson County, Colorado

Jackson County is the fourth-least densely populated of the Colorado 64 counties of the U.S. state of Colorado. The county population was 1,577 at the 2000 Census. The county seat and the only municipality in the county is the Town of Walden.- History :...

 and Grand

Grand County, Colorado

Grand County is the 21st largest of the 64 counties of the State of Colorado of the United States. The county population was 12,442 at U.S. Census 2000...

 counties in north central Colorado. It furnishes the principal north–south link through North Park

North Park (Colorado basin)

North Park is a high, sparsely populated basin in the Rocky Mountains in north central Colorado in the United States. It encompasses a wide valley in Jackson County rimmed by mountain ranges at the headwaters of the North Platte River and several smaller tributaries, including the Michigan River,...

 and a connection to Middle Park

Middle Park (Colorado basin)

Middle Park is a high basin in the Rocky Mountains of north-central Colorado in the United States. It is located in Grand County, on the southwest slope of Rocky Mountain National Park, approximately 50 miles west of Boulder.-Description:The basin surrounds the headwaters of the Colorado River...

 over Willow Creek Pass

Willow Creek Pass (Colorado)

Willow Creek Pass is a high mountain pass in the Rocky Mountains of north central Colorado.-Overview:The pass encompasses the continental divide in the Rabbit Ears Range along the border between Jackson County and Grand County . North of the pass, the Illinois River descends into North Park in...

. It is two-lane along its entire route.

Route description

At the northern end, the highway begins at the Wyoming

Wyoming

Wyoming is a state in the mountain region of the Western United States. The western two thirds of the state is covered mostly with the mountain ranges and rangelands in the foothills of the Eastern Rocky Mountains, while the eastern third of the state is high elevation prairie known as the High...

 state line, where it is contiguous with Wyoming Highway 230

Wyoming Highway 230

Wyoming Highway 230 is known locally as Rivers Road and travels from Wyoming Highway 130 approximately south of Saratoga south from there to intersect WYO 70 in Riverside and then heads southeast to the Colorado-Wyoming State Line. The Route continues southeast in Colorado as Colorado State...

. It follows the North Platte River

North Platte River

The North Platte River is a major tributary of the Platte River and is approximately long counting its many curves, It travels about distance. Its course lies in the U.S...

 and Michigan River

Michigan River

The Michigan River is a tributary of the North Platte River, approximately long, in north central Colorado in the United States. It drains a rural part of the eastern side of North Park in eastern Jackson County. The river issues from Michigan Lakes, a chain of alpine lakes at , along the...

 southward through Cowdrey

Cowdrey, Colorado

Cowdrey is an unincorporated town with a U.S. Post Office in Jackson County, Colorado, United States. The Cowdrey Post Office has the ZIP Code 80434.-Geography:Cowdrey is located at .-See also:* Jackson County, Colorado...

 and Walden

Walden, Colorado

The Town of Walden is a Statutory Town that is the county seat of, and the only incorporated municipality in, Jackson County, Colorado, United States. It is situated in the center of a large open valley called North Park. People from Walden and the surrounding area refer to themselves as "North...

, the county seat of Jackson County and the largest community along the road. At Walden it intersects State Highway 14

Colorado State Highway 14

State Highway 14 in the U.S. state of Colorado is an east–west state highway approximately long. One of the longest state highways in Colorado, it traverses four counties along the northern edge of the state, spanning a geography from the continental divide in the Rocky Mountains to the...

. South of Walden, it crosses the southern end of North Park along the valley of the Illinois River

Illinois River (Colorado)

Illinois River is a tributary of the Michigan River, approximately long, in Jackson County in north central Colorado. It drains part of the North Park basin south of Walden....

, a tributary of the Michigan. It passes the unincorporated community of Rand

Rand, Colorado

Rand is an unincorporated town and a U.S. Post Office established in 1881 in Jackson County, Colorado. It is a ranching community at the southern end of North Park south of Walden consisting of several homes and businesses, a post office, and ranching facilities...

, then ascends into the mountains and crosses the continental divide

Continental divide

A continental divide is a drainage divide on a continent such that the drainage basin on one side of the divide feeds into one ocean or sea, and the basin on the other side either feeds into a different ocean or sea, or else is endorheic, not connected to the open sea...

 at Willow Creek Pass (elevation 9621 ft), one of the lowest crossings of the continental divide in Colorado. On the south side of the pass it descends the sparsely populated valley of Willow Creek

Willow Creek (Colorado)

Willow Creek is a tributary of the Colorado River, approximately long, in north central Colorado in the United States.It rises in northwestern Grand County, in the Arapaho National Forest south of Willow Creek Pass at the continental divide. It flows southeast, through Willow Creek Reservoir and...

 into Middle Park. It terminates at its southern end at U.S. Highway 40 two miles (3.2 km) west of Granby

Granby, Colorado

The Town of Granby is a Statutory Town that is the most populous town in Grand County, Colorado, United States. Granby is situated along U.S. Highway 40 in Middle Park about west of Denver, Colorado, southwest of Rocky Mountain National Park...

.

Major intersections

County	Location	Mile	Destination	Notes
Grand Grand County, Colorado Grand County is the 21st largest of the 64 counties of the State of Colorado of the United States. The county population was 12,442 at U.S. Census 2000...		0.000		South end of route
Jackson Jackson County, Colorado Jackson County is the fourth-least densely populated of the Colorado 64 counties of the U.S. state of Colorado. The county population was 1,577 at the 2000 Census. The county seat and the only municipality in the county is the Town of Walden.- History :...		52.020		Begin concurrency
	Walden Walden, Colorado The Town of Walden is a Statutory Town that is the county seat of, and the only incorporated municipality in, Jackson County, Colorado, United States. It is situated in the center of a large open valley called North Park. People from Walden and the surrounding area refer to themselves as "North...	53.288		End concurrency
		66.558
		75.406	at the Wyoming Wyoming Wyoming is a state in the mountain region of the Western United States. The western two thirds of the state is covered mostly with the mountain ranges and rangelands in the foothills of the Eastern Rocky Mountains, while the eastern third of the state is high elevation prairie known as the High... state line	North end of route