The Wallace 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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79° on Nov. 14, 1995, the hottest reading for this week of the year since 1893. Next is 79° in 2008.
Wallace’s center stands about 200 ft above sea level. Within three miles the land runs from 160 ft to 410 ft, a difference of 250 ft: rolling country. The highest named summit within 15 miles is Deer Peak, about 2,090 ft, 14 miles east.
Under the town center the state geologic map shows Miocene nonmarine rocks (sandstone, conglomerate), from the Oligocene to Pleistocene, less than 34 million years old.
The section below crosses 9 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 15×. 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 7 mi of the line.
Sandstone, conglomerate. Age: Oligocene to Pleistocene, less than 34 million years old. About 3 mi of the line.
Mafic-volcanic. Age: Jurassic, 145 to 202 million years old. About 3 mi of the line.
Coarse-detrital. Age: Pleistocene, less than 2.6 million years old. About 3 mi of the line.
Slate, graywacke. Age: Triassic to Late Jurassic, 145 to 252 million years old. About 2 mi of the line.
Coarse-detrital. Age: Pleistocene to Holocene, 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. 3 smaller units 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 Wallace reaches San Francisco Bay and the Pacific Ocean by way of Bear Creek, the San Joaquin and New York Slough: about 65 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Wallace; river miles along the main stem, rounded.
Wallace has a cold semi-arid climate. Summer afternoons average 96° in July; winter nights fall to about 38° in December. About 13 inches of rain fall in a normal year.
On November 14 Wallace normally reaches 67° and falls to 43°. The record high is 79°, in 1995; the record low 29°, in 1916. The most rain on this date, 0.94 in, fell in 1972.
Normals 1991–2020 and records since 1893 from the Stockton Area threaded record (Stockton Airport, 25 miles south-southwest, 170 ft lower). NOAA, through RCC-ACIS.
