The Eagle Mountain 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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72° on Nov. 11, 1999, the hottest reading for this week of the year since 1911. Next is 71° in 1973.
Eagle Mountain’s center stands about 4,880 ft above sea level. Within three miles the land runs from 4,840 ft to 6,320 ft, a difference of 1,480 ft: steep hill country. The highest named summit within 15 miles is Flat Top Mountain, about 10,580 ft, 10 miles west-northwest.
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 3 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 3×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Unconsolidated. Age: Quaternary, less than 2.6 million years old. About 11 mi of the line.
Sandstone. Age: Carboniferous to Permian, 273 to 324 million years old. About 10 mi of the line.
Clay. Age: Pleistocene, less than 2.6 million years old. About 0.8 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.
Rain that falls on Eagle Mountain runs straight into the Great Basin. The Great Basin 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 Eagle Mountain; river miles along the main stem, rounded.
Eagle Mountain has a warm-summer humid continental climate. Summer afternoons average 90° in July; winter nights fall to about 13° in January. A normal year brings about 34 inches of snow; with the rain, that comes to about 12 inches of water.
On November 14 Eagle Mountain normally reaches 53° and falls to 20°. The record high is 70°, in 1999; the record low −5°, in 1959. The most rain on this date, 0.56 in, fell in 1955.
Normals 1991–2020 and records since 1911 at Fairfield, 5 miles southwest. NOAA, through RCC-ACIS.
