The Collbran plate. Relief from Copernicus GLO-30; rivers and lakes from USGS NHD; watersheds from the USGS Watershed Boundary Dataset; roads and city limits from Census TIGER 2024.
Chance of showers
Partly cloudy
Partly cloudy
Showers likely
Showers likely; cooler
Showers likely
Showers likely
Collbran’s center stands about 5,980 ft above sea level. Within three miles the land runs from 5,810 ft to 7,390 ft, a difference of 1,580 ft: steep hill country. The highest named summit within 15 miles is Leon Peak, about 11,180 ft, 13 miles south-southeast.
The section below crosses 7 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 4×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Claystone. Age: Paleocene to Eocene, 34 to 66 million years old. About 10 mi of the line.
Unconsolidated. Age: Pleistocene, less than 0.5 million years old. About 6 mi of the line.
Shale, sandstone, marlstone. Age: Eocene, 34 to 56 million years old. About 5 mi of the line.
Unconsolidated. Age: Quaternary, less than 2.6 million years old. About 1 mi of the line.
Gravel, unconsolidated. Age: Pleistocene, 0.2 to 1.6 million years old. About 0.8 mi of the line.
Shale, oil-shale. Age: Eocene, 34 to 56 million years old. About 0.8 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 1 smaller unit along the line are not listed.
Heights from Copernicus GLO-90 (a surface model: it includes buildings and tree canopy); summits from USGS GNIS; rivers from USGS NHDPlus HR; rock from the USGS State Geologic Map Compilation.
A raindrop that lands in Collbran reaches the Gulf of California by way of Grove Creek, Plateau Creek and the Colorado: about 1,200 river miles.
Lakes on the way: Lake Mead, Lake Powell, Lake Mohave and Lake Havasu.
Seldom reaches the sea. Dams and canals now take nearly all of the Colorado before its old delta in Mexico.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Collbran; river miles along the main stem, rounded.
