The Logan 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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71° on Nov. 12, 1960, the hottest reading for this week of the year since 1956. Next is 70° in 2016.
Logan’s center stands about 4,540 ft above sea level. Within three miles the land runs from 4,430 ft to 6,070 ft, a difference of 1,640 ft: steep hill country. The highest named summit within 15 miles is Naomi Peak, about 9,920 ft, 15 miles northeast.
Under the town center the state geologic map shows Lake Bonneville deposits (clay), from the Pleistocene, 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.
Clay. Age: Pleistocene, less than 2.6 million years old. About 8 mi of the line.
Unconsolidated. Age: Quaternary, less than 2.6 million years old. About 4 mi of the line.
Dolostone. Age: Early Devonian to Late Devonian, 359 to 422 million years old. About 3 mi of the line.
Sandstone, carbonate. Age: Middle Pennsylvanian to Permian, 273 to 315 million years old. About 2 mi of the line.
Dolostone. Age: Silurian, 422 to 445 million years old. About 2 mi of the line.
Mudstone, unconsolidated. Age: Middle Miocene to Late Pliocene, 2.6 to 16 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 Logan reaches Great Salt Lake by way of the Logan and the Bear River: about 85 river miles. Great Salt Lake has no outlet to the sea: the water leaves only by evaporating or soaking into the ground.
70 miles of the trip are on the Bear River.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Logan; river miles along the main stem, rounded.
Logan has a dry-summer hot-summer continental climate. Summer afternoons average 89° in July; winter nights fall to about 14° in January. A normal year brings about 44 inches of snow; with the rain, that comes to about 17 inches of water.
On November 14 Logan normally reaches 48° and falls to 25°. The record high is 69°, in 2025; the record low 7°, in 1959. The most rain on this date, 1.49 in, fell in 1958.
Normals 1991–2020 and records since 1956 at Logan Radio Kvnu, here. NOAA, through RCC-ACIS.
