The Inkom 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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−13° on Nov. 16, 1955, the coldest reading for this week of the year since 1939. Next is −6° in 1978.
Inkom’s center stands about 4,550 ft above sea level. Within three miles the land runs from 4,500 ft to 5,980 ft, a difference of 1,480 ft: steep hill country. The highest named summit within 15 miles is Bonneville Peak, about 9,250 ft, 6 miles east-southeast.
Under the town center the state geologic map shows Alluvial deposits (gravel, sand, silt), from the Quaternary, less than 2.6 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 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.
Age: Neoproterozoic to Cambrian, 487 to 1,000 million years old. About 11 mi of the line.
Gravel. Age: Quaternary, less than 2.6 million years old. About 7 mi of the line.
Gravel, sand, silt. Age: Quaternary, less than 2.6 million years old. About 2 mi of the line.
Limestone, dolostone. Age: Cambrian to Ordovician, 445 to 542 million years old. About 2 mi of the line.
Mixed-clastic, volcanic. Age: Early Miocene to Pleistocene, 2 to 16 million years old. About 2 mi of the line.
Basalt. Age: Late Pliocene to Pleistocene, less than 3 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. 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.
A raindrop that lands in Inkom reaches the Pacific Ocean by way of Rapid Creek, the Portneuf, the Snake and the Columbia: about 1,080 river miles.
Lakes on the way: American Falls Reservoir, Lake Umatilla, Brownlee Reservoir and Cove Arm Lake.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Inkom; river miles along the main stem, rounded.
Inkom has a cold semi-arid climate. Summer afternoons average 89° in July; winter nights fall to about 17° in January. A normal year brings about 38 inches of snow; with the rain, that comes to about 12 inches of water.
On November 14 Inkom normally reaches 47° and falls to 24°. The record high is 66°, in 2016; the record low −2°, in 1978. The most rain on this date, 0.66 in, fell in 1971.
Normals 1991–2020 and records since 1939 from the Pocatello Area threaded record (Pocatello Regional Airport, 18 miles west-northwest). NOAA, through RCC-ACIS.
