The West Point 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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West Point’s center stands about 2,780 ft above sea level. Within three miles the land runs from 1,940 ft to 3,480 ft, a difference of 1,540 ft: steep hill country. The highest named summit within 15 miles is Blue Mountain, about 6,020 ft, 10 miles east-southeast.
Under the town center the state geologic map shows Mesozoic granitic rocks, unit 3 (Sierra Nevada, Death Valley area, Northern Mojave Desert and Transverse Ranges) (granodiorite), from the Permian to Tertiary, 2.6 to 260 million years old.
The section below crosses 3 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.
Granodiorite. Age: Permian to Tertiary, 2.6 to 260 million years old. About 11 mi of the line.
Argillite, quartzite, phyllite. Age: Ordovician to Triassic, 202 to 487 million years old. About 9 mi of the line.
Andesite. Age: Late Oligocene to Pleistocene, 2 to 24 million years old. About 5 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 West Point reaches San Francisco Bay and the Pacific Ocean by way of the Middle Fork Mokelumne, the Mokelumne, the South Mokelumne, the San Joaquin and New York Slough: about 120 river miles.
Lake on the way: Camanche Reservoir.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of West Point; river miles along the main stem, rounded.
