The Jones Valley 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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81° on Nov. 12, 2019, the hottest reading for this week of the year since 1943. Next is 80° in 1955.
Jones Valley’s center stands about 950 ft above sea level. Within three miles the land runs from 600 ft to 2,330 ft, a difference of 1,730 ft: steep hill country. The highest named summit within 15 miles is Bohemotash Mountain, about 4,430 ft, 13 miles west-northwest.
Under the town center the state geologic map shows Triassic marine rocks, unit 2 (Eastern Klamath Mountains) (siltstone-mudstone, mudstone), from the Middle Triassic to Late Triassic, 202 to 247 million years old.
The section below crosses 7 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.
Siltstone-mudstone, mudstone. Age: Middle Triassic to Late Triassic, 202 to 247 million years old. About 6 mi of the line.
Sandstone, conglomerate. Age: Miocene to Pleistocene, less than 23 million years old. About 6 mi of the line.
Mafic-volcanic. Age: Permian, 252 to 299 million years old. About 5 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.
Diorite. Age: Permian, 252 to 299 million years old. About 0.8 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 1 smaller unit along the line are not listed.
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 Jones Valley reaches San Francisco Bay and the Pacific Ocean by way of East Dry Creek, Dry Creek, Little Cow Creek, Cow Creek and the Sacramento: about 290 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Jones Valley; river miles along the main stem, rounded.
Jones Valley has a hot-summer Mediterranean climate. Summer afternoons average 97° in July; winter nights fall to about 40° in January. About 63 inches of rain fall in a normal year.
On November 14 Jones Valley normally reaches 63° and falls to 46°. The record high is 80°, in 1995; the record low 31°, in 2000. The most rain on this date, 6.50 in, fell in 1965.
Normals 1991–2020 and records since 1943 at Shasta Dam, 9 miles west, 120 ft higher. NOAA, through RCC-ACIS.
