The Leadore 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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Leadore’s center stands about 5,970 ft above sea level. Within three miles the land runs from 5,840 ft to 7,050 ft, a difference of 1,210 ft: steep hill country. The highest named summit within 15 miles is Yellow Peak, about 10,920 ft, 13 miles southwest.
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 11 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.
Gravel. Age: Quaternary, less than 2.6 million years old. About 7 mi of the line.
Unconsolidated, mixed-clastic. Age: Eocene to Oligocene, 23 to 56 million years old. About 5 mi of the line.
Age: Carboniferous to Permian, 252 to 324 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.
Coarse-detrital, fine-detrital. Age: Pleistocene, less than 2.6 million years old. About 2 mi of the line.
Dolostone, limestone, sandstone. Age: Ordovician to Devonian, 359 to 487 million years old. About 2 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 5 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 Leadore reaches the Pacific Ocean by way of the Lemhi, the Salmon, the Snake and the Columbia: about 820 river miles.
Lake on the way: Lake Umatilla.
260 miles of the trip are on the Salmon.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Leadore; river miles along the main stem, rounded.
