The Jensen 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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67° on Nov. 14, 1967, the hottest reading for this week of the year since 1925. Next is 67° in 1989.
Jensen’s center stands about 4,740 ft above sea level. Within three miles the land runs from 4,720 ft to 5,080 ft, a difference of 360 ft: rolling country. The highest named summit within 15 miles is Ruple Point, about 7,680 ft, 14 miles northeast.
Under the town center the state geologic map shows Alluvium and colluvium (unconsolidated), from the Quaternary, less than 2.6 million years old.
The section below crosses 11 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.
Coarse-detrital. Age: Quaternary, less than 2.6 million years old. About 9 mi of the line.
Sandstone. Age: Permian, 252 to 299 million years old. About 5 mi of the line.
Shale. Age: Late Cretaceous, 72 to 100 million years old. About 2 mi of the line.
Sandstone-mudstone. Age: Middle Eocene to Early Oligocene, 28 to 48 million years old. About 2 mi of the line.
Arenite. Age: Early Jurassic, 175 to 202 million years old. About 2 mi of the line.
Unconsolidated. Age: Quaternary, 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. 5 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 Jensen reaches the Gulf of California by way of the Green River and the Colorado: about 1,290 river miles.
Lakes on the way: Lake Mead, Lake Powell, Lake Mohave and Lake Havasu.
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 Jensen; river miles along the main stem, rounded.
Jensen has a cold semi-arid climate. Summer afternoons average 92° in July; winter nights fall to about 3° in January. A normal year brings about 19 inches of snow; with the rain, that comes to about 8 inches of water.
On November 14 Jensen normally reaches 50° and falls to 19°. The record high is 67°, in 1967; the record low 7°, in 2018. The most rain on this date, 0.39 in, fell in 1987.
Normals 1991–2020 and records since 1925 at Jensen, here. NOAA, through RCC-ACIS.
