The Fort Mohave 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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90° on Nov. 11, 1989, the hottest reading for this week of the year since 1977. Next is 89° in 2016.
Fort Mohave’s center stands about 620 ft above sea level. Within three miles the land runs from 480 ft to 980 ft, a difference of 500 ft: hilly country. The highest named summit within 15 miles is Mount Nutt, about 5,030 ft, 14 miles east-northeast.
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 7 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.
Sand, silt, clay. Age: Pleistocene to Holocene, less than 2 million years old. About 9 mi of the line.
Basalt, andesite, dacite. Age: Middle Eocene to Late Miocene, 11 to 38 million years old. About 4 mi of the line.
Coarse-detrital. Age: Pleistocene, less than 2.6 million years old. About 4 mi of the line.
Coarse-detrital. Age: Pleistocene to Holocene, less than 2.6 million years old. About 4 mi of the line.
Granite, granodiorite, diorite. Age: Late Oligocene to Middle Miocene, 14 to 26 million years old. About 2 mi of the line.
Orthogneiss. Age: Paleoproterozoic to Miocene, 5.3 to 2,500 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. 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.
Fort Mohave has a hot desert climate. Summer afternoons average 111° in July; winter nights fall to about 44° in December. About 5 inches of rain fall in a normal year.
On November 14 Fort Mohave normally reaches 75° and falls to 51°. The record high is 88°, in 1999; the record low 35°, in 2000. The most rain on this date, 0.25 in, fell in 1978.
Normals 1991–2020 and records since 1977 at Bullhead City, 10 miles north. NOAA, through RCC-ACIS.
