The Corwin Springs 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.
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Corwin Springs’s center stands about 5,140 ft above sea level. Within three miles the land runs from 5,090 ft to 8,750 ft, a difference of 3,660 ft: mountain country. The highest named summit within 15 miles is Electric Peak, about 10,860 ft, 8 miles south-southwest.
Under the town center the state geologic map shows Quartzofeldspathic gneiss, from the Archean.
The section below crosses 5 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.
Andesite, dacite. Age: Early Eocene, 48 to 56 million years old. About 14 mi of the line.
Schist, gneiss. Age: Archean. About 5 mi of the line.
Gneiss. Age: Archean. About 3 mi of the line.
Age: Tertiary, 2.6 to 66 million years old. About 2 mi of the line.
Age: Tertiary, 2.6 to 66 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.
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 Corwin Springs reaches the Gulf of America by way of the Yellowstone, the Missouri and the Mississippi: about 3,290 river miles.
Lakes on the way: Lake Oahe, Lake Sakakawea, Lake Sharpe and Lake Francis Case.
1,170 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Corwin Springs; river miles along the main stem, rounded.
