The Pine Grove 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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Pine Grove’s center stands about 2,230 ft above sea level. Within three miles the land runs from 1,940 ft to 3,410 ft, a difference of 1,470 ft: steep hill country. The highest named summit within 15 miles is Mount Wilson, about 5,590 ft, 15 miles west-southwest.
The section below crosses 8 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.
Basaltic-andesite, basalt. Age: Early Pliocene to Pleistocene, 1.2 to 3.9 million years old. About 8 mi of the line.
Basalt. Age: Miocene to Pliocene, 2.6 to 23 million years old. About 5 mi of the line.
Sandstone-mudstone. Age: Pliocene to Pleistocene, less than 5.3 million years old. About 4 mi of the line.
Basalt. Age: Early Miocene to Middle Miocene, 12 to 23 million years old. About 2 mi of the line.
Basaltic-andesite, andesite. Age: Pliocene to Pleistocene, less than 5.3 million years old. About 2 mi of the line.
Gravel, sand, boulders. Age: Pleistocene, less than 2.6 million years old. About 1 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 2 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 Pine Grove reaches the Pacific Ocean by way of Wapinitia Creek, the Deschutes and the Columbia: about 270 river miles.
200 miles of the trip are on the Columbia.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Pine Grove; river miles along the main stem, rounded.
