The Valley 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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Valley’s center stands about 1,680 ft above sea level. Within three miles the land runs from 1,650 ft to 2,480 ft, a difference of 830 ft: hilly country. The highest named summit within 15 miles is Huckleberry Mountain, about 5,800 ft, 12 miles west-northwest.
Under the town center the state geologic map shows Alluvium (silt, sand), from the Holocene, less than 12,000 years old.
The section below crosses 6 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.
Basalt. Age: Late Oligocene to Early Pliocene, 3.6 to 28 million years old. About 8 mi of the line.
Sand, gravel. Age: Pleistocene, less than 2.6 million years old. About 6 mi of the line.
Argillite, siltstone. Age: Mesoproterozoic to Early Cambrian, 521 to 1,600 million years old. About 6 mi of the line.
Silt, sand. Age: Holocene, less than 12,000 years old. About 3 mi of the line.
Quartzite. Age: Neoproterozoic to Early Cambrian, 521 to 1,000 million years old. About 0.8 mi of the line.
Gneiss. Age: Paleozoic to Mesozoic, 66 to 542 million years old. About 0.6 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 Valley reaches the Pacific Ocean by way of the Colville and the Columbia: about 740 river miles.
Lake on the way: Lake Umatilla.
410 miles of the trip are on the Columbia.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Valley; river miles along the main stem, rounded.
