The Bay Point 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.
Partly cloudy
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87° on Nov. 15, 2008, the hottest reading for this week of the year since 1950. Next is 82° in 2010.
Bay Point’s center stands about 60 ft above sea level. Within three miles the land runs from 0 ft to 1,030 ft, a difference of 1,030 ft: steep hill country. Open water lies within three miles. The highest named summit within 15 miles is Mount Diablo, about 3,810 ft, 10 miles south.
Under the town center the state geologic map shows Older Quaternary alluvium and marine deposits (coarse-detrital), from the Pleistocene, less than 2.6 million years old.
The section below crosses 10 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 7×. 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. Age: Pleistocene to Holocene, less than 2.6 million years old. About 9 mi of the line.
Mudstone, sandstone. Age: Paleocene to Oligocene, 23 to 66 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.
Greenstone. Age: Jurassic to Cretaceous, 66 to 202 million years old. About 2 mi of the line.
Sandstone, mudstone. Age: Jurassic to Cretaceous, 66 to 202 million years old. About 2 mi of the line.
Sandstone, conglomerate. Age: Miocene to Pleistocene, less than 23 million years old. About 0.9 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 4 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.
Rain that falls on Bay Point runs only a short way, about 2 miles, to San Francisco Bay and the Pacific Ocean.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Bay Point; river miles along the main stem, rounded.
Bay Point has a hot-summer Mediterranean climate. Summer afternoons average 90° in July; winter nights fall to about 40° in January. About 24 inches of rain fall in a normal year.
On November 14 Bay Point normally reaches 66° and falls to 46°. The record high is 79°, in 2008; the record low 22°, in 1985. The most rain on this date, 2.15 in, fell in 1972.
Normals 1991–2020 and records since 1950 at Fairfield, 18 miles north-northwest. NOAA, through RCC-ACIS.
