The Glenbrook 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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5.29 inches of rain fell in two days, the most for this week of the year since records began in 1909. The next wettest, 4.96 inches, fell in 2017.
Glenbrook’s center stands about 6,260 ft above sea level. Within three miles the land runs from 6,220 ft to 8,390 ft, a difference of 2,170 ft: mountain country. The highest named summit within 15 miles is Monument Peak, about 10,010 ft, 12 miles south.
Under the town center the state geologic map shows Alluvium, undifferentiated (coarse-detrital, fine-detrital), from the Pleistocene to Holocene, less than 2.6 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 4×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Coarse-detrital, fine-detrital. Age: Pleistocene to Holocene, less than 2.6 million years old. About 5 mi of the line.
Metaandesite, metadacite, metarhyolite. Age: Triassic to Jurassic, 145 to 252 million years old. About 4 mi of the line.
Granodiorite, granite. Age: Cretaceous, 66 to 145 million years old. About 2 mi of the line.
Coarse-detrital, fine-detrital. Age: Pleistocene to Holocene, less than 2.6 million years old. About 1.0 mi of the line.
Andesite, dacite. Age: Miocene, 5.3 to 23 million years old. About 0.4 mi of the line.
Andesite, basalt. Age: Late Pliocene to Pleistocene, less than 3.6 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 Glenbrook reaches Pyramid Lake by way of Lake Tahoe and the Truckee: about 130 river miles. Pyramid Lake has no outlet to the sea: the water leaves only by evaporating or soaking into the ground.
Lake on the way: Lake Tahoe.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Glenbrook; river miles along the main stem, rounded.
Glenbrook has a dry-summer warm-summer continental climate. Summer afternoons average 78° in July; winter nights fall to about 21° in January. A normal year brings about 179 inches of snow; with the rain, that comes to about 33 inches of water.
On November 14 Glenbrook normally reaches 48° and falls to 26°. The record high is 65°, in 1990; the record low 5°, in 1915. The most rain on this date, 2.99 in, fell in 1981.
Normals 1991–2020 and records since 1909 from the Tahoe City Area threaded record (Tahoe City, 12 miles west-northwest). NOAA, through RCC-ACIS.
