The Mantua 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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−17° on Nov. 16, 1955, the coldest reading for this week of the year since 1935. Next is 1° in 1978.
Mantua’s center stands about 5,170 ft above sea level. Within three miles the land runs from 4,800 ft to 7,480 ft, a difference of 2,680 ft: mountain country. The highest named summit within 15 miles is Ben Lomond, about 9,660 ft, 9 miles south.
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 4×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Dolostone, shale. Age: Middle Cambrian, 497 to 521 million years old. About 6 mi of the line.
Unconsolidated. Age: Quaternary, less than 2.6 million years old. About 6 mi of the line.
Peat. Age: Holocene, less than 12,000 years old. About 3 mi of the line.
Mixed-clastic. Age: Mesoproterozoic to Neoproterozoic, 542 to 1,600 million years old. About 2 mi of the line.
Arenite. Age: Early Cambrian to Middle Cambrian, 497 to 542 million years old. About 2 mi of the line.
Clay. Age: Pleistocene, 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 Mantua reaches Great Salt Lake by way of Black Slough, the Reeder Overflow and the Bear River: about 25 river miles. Great Salt Lake has no outlet to the sea: the water leaves only by evaporating or soaking into the ground.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Mantua; river miles along the main stem, rounded.
Mantua has a dry-summer warm-summer continental climate. Summer afternoons average 87° in July; winter nights fall to about 9° in January. A normal year brings about 108 inches of snow; with the rain, that comes to about 31 inches of water.
On November 14 Mantua normally reaches 46° and falls to 23°. The record high is 66°, in 1967; the record low 8°, in 1978. The most rain on this date, 2.17 in, fell in 1955.
Normals 1991–2020 and records since 1935 at Pineview Dam, 17 miles south-southeast, 230 ft lower. NOAA, through RCC-ACIS.
