The Brewster 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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Brewster’s center stands about 810 ft above sea level. Within three miles the land runs from 780 ft to 2,850 ft, a difference of 2,070 ft: mountain country. The highest named summit within 15 miles is Goat Mountain, about 5,330 ft, 11 miles west-southwest.
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.
Sand, gravel. Age: Pleistocene, less than 2.6 million years old. About 8 mi of the line.
Granite. Age: Precambrian to Eocene. About 4 mi of the line.
Basalt. Age: Late Oligocene to Early Pliocene, 3.6 to 28 million years old. About 3 mi of the line.
Gneiss. Age: Precambrian to Eocene. About 3 mi of the line.
Schist. Age: Triassic to Early Cretaceous, 100 to 252 million years old. About 3 mi of the line.
Silt, sand. Age: Holocene, less than 12,000 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 Brewster reaches the Pacific Ocean by way of the Columbia: about 520 river miles.
Lake on the way: Lake Umatilla.
250 miles of the trip are on the Columbia.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Brewster; river miles along the main stem, rounded.
