The Rancho Tehama Reserve 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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87° on Nov. 14, 1995, the hottest reading for this week of the year since 1933. Next is 86° in 2019.
Rancho Tehama Reserve’s center stands about 560 ft above sea level. Within three miles the land runs from 460 ft to 890 ft, a difference of 430 ft: hilly country. The highest named summit within 15 miles is Eagle Peak, about 3,660 ft, 14 miles west-southwest.
Under the town center the state geologic map shows Plio-Pleistocene and Pliocene loosely consolidated deposits (sandstone, conglomerate), from the Miocene to Pleistocene, less than 23 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 12×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Sandstone, conglomerate. Age: Miocene to Pleistocene, less than 23 million years old. About 15 mi of the line.
Siltstone-mudstone. Age: Late Jurassic to Early Cretaceous, 100 to 164 million years old. About 3 mi of the line.
Coarse-detrital. Age: Pleistocene to Holocene, less than 2.6 million years old. About 3 mi of the line.
Sandstone, siltstone-mudstone. Age: Late Cretaceous, 66 to 100 million years old. About 2 mi of the line.
Siltstone-mudstone. Age: Early Cretaceous, 113 to 145 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 Rancho Tehama Reserve reaches San Francisco Bay and the Pacific Ocean by way of Elder Creek and the Sacramento: about 250 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Rancho Tehama Reserve; river miles along the main stem, rounded.
Rancho Tehama Reserve has a hot-summer Mediterranean climate. Summer afternoons average 98° in July; winter nights fall to about 38° in January. About 23 inches of rain fall in a normal year.
On November 14 Rancho Tehama Reserve normally reaches 65° and falls to 43°. The record high is 87°, in 1995; the record low 25°, in 1985. The most rain on this date, 1.39 in, fell in 1954.
Normals 1991–2020 and records since 1933 at Red Bluff Municipal Airport, 12 miles northeast, 210 ft lower. NOAA, through RCC-ACIS.
