The Fortuna Foothills 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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30° on Nov. 17, 1958, the coldest reading for this week of the year since 1876. Next is 33° in 1964.
Fortuna Foothills’s center stands about 340 ft above sea level. Within three miles the land runs from 230 ft to 600 ft, a difference of 370 ft: rolling country. The highest named summit within 15 miles is Sheep Mountain, about 3,030 ft, 13 miles southeast.
Under the town center the state geologic map shows Quaternary surficial deposits, undivided (sand, silt, clay), from the Pleistocene to Holocene, less than 2 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 9×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Sand, silt, clay. Age: Pleistocene to Holocene, less than 2 million years old. About 7 mi of the line.
Sand, gravel. Age: Holocene, less than 10,000 years old. About 6 mi of the line.
Granite, granodiorite, tonalite. Age: Paleoproterozoic, 1.6 to 1.8 billion years old. About 4 mi of the line.
Metasedimentary, metavolcanic, gneiss. Age: Paleoproterozoic, 1.6 to 1.8 billion years old. About 3 mi of the line.
Coarse-detrital. Age: Pleistocene to Holocene, less than 2.6 million years old. About 2 mi of the line.
Granite. Age: Late Cretaceous to Early Eocene, 50 to 80 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 Fortuna Foothills reaches the Gulf of California by way of Fortuna Wash, the Gila and the Colorado: about 140 river miles.
Seldom reaches the sea. Dams and canals now take nearly all of the Colorado before its old delta in Mexico.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Fortuna Foothills; river miles along the main stem, rounded.
Fortuna Foothills has a hot desert climate. Summer afternoons average 107° in July; winter nights fall to about 47° in December. About 3 inches of rain fall in a normal year.
On November 14 Fortuna Foothills normally reaches 78° and falls to 55°. The record high is 93°, in 1906; the record low 37°, in 1929. The most rain on this date, 0.50 in, fell in 1899.
Normals 1991–2020 and records since 1876 from the Yuma Area threaded record (Yuma International Airport, 11 miles west, 130 ft lower). NOAA, through RCC-ACIS.
