The Granite 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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Granite’s center stands about 4,660 ft above sea level. Within three miles the land runs from 4,510 ft to 6,000 ft, a difference of 1,490 ft: steep hill country. The highest named summit within 15 miles is Red Mountain, about 8,850 ft, 13 miles east-northeast.
Under the town center the state geologic map shows Clastic rocks and andesite flows, from the Paleocene to Early Oligocene, 28 to 66 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 6×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Quartz-diorite, granitic, granodiorite. Age: Late Triassic to Late Cretaceous, 66 to 208 million years old. About 9 mi of the line.
Andesite. Age: Paleocene to Early Oligocene, 28 to 66 million years old. About 8 mi of the line.
Argillite, chert, phyllite. Age: Permian to Triassic, 202 to 299 million years old. About 4 mi of the line.
Gravel, sand, boulders. Age: Pleistocene, less than 2.6 million years old. About 3 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 Granite reaches the Pacific Ocean by way of Bull Run Creek, Granite Creek, the North Fork John Day, the John Day and the Columbia: about 490 river miles.
Lake on the way: Lake Umatilla.
210 miles of the trip are on the Columbia.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Granite; river miles along the main stem, rounded.
