The Westwood 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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71° on Nov. 13, 1995, the hottest reading for this week of the year since 1893. Next is 69° in 1896.
Westwood’s center stands about 5,110 ft above sea level. Within three miles the land runs from 4,980 ft to 5,860 ft, a difference of 880 ft: hilly country. The highest named summit within 15 miles is South Caribou, about 7,700 ft, 14 miles northwest.
Under the town center the state geologic map shows Quaternary volcanic flow rocks, unit 1 (Cascade Volcanic Field) (andesite, basalt), from the Late Pliocene to Pleistocene, less than 3.6 million years old.
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 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.
Andesite, basalt. Age: Late Pliocene to Pleistocene, less than 3.6 million years old. About 9 mi of the line.
Andesite, basalt. Age: Late Oligocene to Pleistocene, 2 to 24 million years old. About 4 mi of the line.
Andesite. Age: Devonian to Permian, 252 to 422 million years old. About 4 mi of the line.
Coarse-detrital. Age: Pleistocene to Holocene, less than 2.6 million years old. About 3 mi of the line.
Mafic-volcanic, greenstone. Age: Paleozoic to Mesozoic, 66 to 542 million years old. About 3 mi of the line.
Coarse-detrital. 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.
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 Westwood reaches San Francisco Bay and the Pacific Ocean by way of Robbers Creek, Hamilton Branch, the North Fork Feather, the Feather and the Sacramento: about 240 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 Westwood; river miles along the main stem, rounded.
Westwood has a warm-summer Mediterranean climate. Summer afternoons average 88° in July; winter nights fall to about 22° in January. About 13 inches of rain fall in a normal year.
On November 14 Westwood normally reaches 52° and falls to 28°. The record high is 68°, in 1995; the record low 1°, in 1985. The most rain on this date, 1.58 in, fell in 1903.
Normals 1991–2020 and records since 1893 at Susanville 2 SW, 20 miles east-northeast, 900 ft lower. NOAA, through RCC-ACIS.
