The Lake Almanor West 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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Lake Almanor West’s center stands about 4,670 ft above sea level. Within three miles the land runs from 4,500 ft to 4,790 ft, a difference of 290 ft: rolling country. The highest named summit within 15 miles is Mount Harkness, about 8,020 ft, 15 miles north-northwest.
Under the town center the state geologic map shows Tertiary volcanic flow rocks, unit 17 (Cascade Range) (andesite, basalt), from the Late Oligocene to Pleistocene, 2 to 24 million years old.
The section below crosses 5 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.
Slate. Age: Permian to Jurassic, 145 to 299 million years old. About 8 mi of the line.
Andesite, basalt. Age: Late Oligocene to Pleistocene, 2 to 24 million years old. About 8 mi of the line.
Coarse-detrital. Age: Pleistocene, less than 2.6 million years old. About 1 mi of the line.
Peridotite, serpentinite. Age: Neoproterozoic to Early Jurassic, 175 to 1,000 million years old. About 0.4 mi of the line.
Coarse-detrital. Age: Pleistocene to Holocene, less than 2.6 million years old. About 0.4 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 Lake Almanor West reaches San Francisco Bay and the Pacific Ocean by way of Lake Almanor, the North Fork Feather, the Feather and the Sacramento: about 230 river miles.
Lake on the way: Lake Almanor.
75 miles of the trip are on the Sacramento.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Lake Almanor West; river miles along the main stem, rounded.
