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The Fountain Formation is a Pennsylvanian bedrock unit consisting primarily of conglomerate, sandstone, or arkose, in the states of Colorado and Wyoming in the United States, along the east side of the Front Range of the Rocky Mountains, and along the west edge of the Denver Basin.
There are a few instances of number duplication between federal and state highways (such as with Route 72 and I-72), but any such pairs of highways are nowhere near each other to avoid confusion. In some states (such as Arkansas and New Mexico), highways are allowed to be discontinuous. Missouri overlaps highways in order to maintain continuity.
Other Colorado examples of Fountain Formation geology include nearby Roxborough State Park, Garden of the Gods near Colorado Springs, and the Flatirons near Boulder. The rocks were formed about 290-296 million years ago when the Ancestral Rocky Mountains were eroded during the Pennsylvanian epoch .
In 1926, the U.S. Highway System was created and many of the highways listed below became part of a new U.S. Highway; in some cases, a highway's number was changed so as not to conflict with a U.S. Highway number (or, later, an Interstate Highway number) which came through Missouri.
State Highway 110 is the shortest route maintained by CDOT with a span of 0.186 miles (0.299 km). The Colorado Department of Transportation (CDOT) is the agency responsible for maintaining the Colorado State Highway System, including Interstate Highways, United States Numbered Highways, and numbered state highways within the state of Colorado. [4]
US 160 was diverted southwesterly from Cortez to follow its present route past the Four Corners into Arizona, absorbing the route numbered U.S. Highway 164. [ 4 ] In 2021, the portion of the highway between Walsenburg and the highway's junction with Colorado State Highway 12 was designated a National Scenic Byway .
The landmarks are located in 14 of the state's 64 counties. Five counties each contain all or part of two NNLs, while two landmarks are split between two counties. The first two designations, Slumgullion Earthflow and Summit Lake, were made in 1965, while the most recent designation, Glenwood Caverns and Iron Mountain Hot Springs, was made in 2023.
The Colorado Scenic and Historic Byways Program was established in March 1989, and is one of the oldest state scenic byway programs. Since 1989, the program has designated 26 Colorado Scenic and Historic Byways with 2,585 miles (4,160 km) of roadway, 4,459 miles (7,176 km) including scenic byway extensions in adjacent states.