The Keddie 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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−3° on Nov. 12, 1985, the coldest reading for this week of the year since 1895. Next is 5° in 1939.
Keddie’s center stands about 3,290 ft above sea level. Within three miles the land runs from 2,990 ft to 5,470 ft, a difference of 2,480 ft: mountain country. The highest named summit within 15 miles is Tower Rock, about 7,680 ft, 10 miles east.
Under the town center the state geologic map shows Paleozoic marine rocks, undivided, unit 4 (Western Sierra Nevada) (argillite, quartzite, phyllite), from the Ordovician to Triassic, 202 to 487 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.
Argillite, quartzite, phyllite. Age: Ordovician to Triassic, 202 to 487 million years old. About 9 mi of the line.
Andesite. Age: Devonian to Permian, 252 to 422 million years old. About 8 mi of the line.
Peridotite, serpentinite. Age: Neoproterozoic to Early Jurassic, 175 to 1,000 million years old. About 5 mi of the line.
Slate. Age: Permian to Jurassic, 145 to 299 million years old. About 1 mi of the line.
Slate, graywacke. Age: Permian, 252 to 299 million years old. About 1 mi of the line.
Chert. Age: Carboniferous to Permian, 273 to 359 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 Keddie reaches San Francisco Bay and the Pacific Ocean by way of Spanish Creek, the East Branch North Fork Feather, the North Fork Feather, the Feather and the Sacramento: about 230 river miles.
75 miles of the trip are on the Sacramento.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Keddie; river miles along the main stem, rounded.
Keddie has a warm-summer Mediterranean climate. Summer afternoons average 89° in July; winter nights fall to about 25° in January. A normal year brings about 28 inches of snow; with the rain, that comes to about 42 inches of water.
On November 14 Keddie normally reaches 53° and falls to 29°. The record high is 80°, in 1921; the record low 5°, in 1985. The most rain on this date, 3.35 in, fell in 2025.
Normals 1991–2020 and records since 1895 at Quincy, 5 miles south, 130 ft higher. NOAA, through RCC-ACIS.
