The Mountain Home 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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Mountain Home’s center stands about 3,150 ft above sea level. Within three miles the land runs from 3,090 ft to 3,420 ft, a difference of 330 ft: rolling country. The highest named summit within 15 miles is Tollgate Hill, about 5,270 ft, 11 miles northeast.
Under the town center the state geologic map shows Alluvial deposits (gravel, sand, silt), from the Quaternary, less than 2.6 million years old.
The section below crosses 4 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 8×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Basalt. Age: Late Pliocene to Pleistocene, less than 3 million years old. About 18 mi of the line.
Rhyolite. Age: Middle Miocene to Late Miocene, 8 to 14 million years old. About 3 mi of the line.
Gravel, sand, silt. Age: Quaternary, less than 2.6 million years old. About 2 mi of the line.
Gravel, sand, silt. Age: Pliocene to Pleistocene, less than 5.3 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 Mountain Home reaches the Pacific Ocean by way of Rattlesnake Creek, the Snake and the Columbia: about 830 river miles.
Lakes on the way: Lake Umatilla, Brownlee Reservoir, Cove Arm Lake and Hells Canyon Reservoir.
240 miles of the trip are on the Snake.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Mountain Home; river miles along the main stem, rounded.
