The Star Valley Ranch 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.
Partly cloudy
Partly cloudy; warmer
Mostly cloudy
Showers likely
Chance of showers
Showers likely
Showers likely
Star Valley Ranch’s center stands about 6,250 ft above sea level. Within three miles the land runs from 5,870 ft to 9,190 ft, a difference of 3,320 ft: mountain country. The highest named summit within 15 miles is Deadman Mountain, about 10,290 ft, 15 miles east.
Under the town center the state geologic map shows Alluvium and Colluvium (clay, silt, sand), from the Pleistocene to Holocene, less than 2.6 million years old.
The section below crosses 8 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 5×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Sandstone, shale. Age: Cretaceous, 66 to 145 million years old. About 6 mi of the line.
Clay, silt, sand. Age: Pleistocene to Holocene, less than 2.6 million years old. About 6 mi of the line.
Dolostone, limestone. Age: Middle Cambrian to Late Ordovician, 445 to 521 million years old. About 5 mi of the line.
Limestone, dolostone. Age: Late Devonian to Carboniferous, 324 to 384 million years old. About 4 mi of the line.
Gravel, sand, silt. Age: Quaternary, less than 2.6 million years old. About 2 mi of the line.
Unconsolidated. Age: Pleistocene to Holocene, less than 2.6 million years old. About 0.9 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 2 smaller units 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 Star Valley Ranch reaches the Pacific Ocean by way of North Branch Cedar Creek, the Salt River, the Snake and the Columbia: about 1,250 river miles.
Lakes on the way: American Falls Reservoir, Palisades Reservoir, Lake Umatilla and Brownlee Reservoir.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Star Valley Ranch; river miles along the main stem, rounded.
