The Lost River 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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63° on Nov. 12, 1999, the hottest reading for this week of the year since 1958. Next is 63° in 2016.
Lost River’s center stands about 6,180 ft above sea level. Within three miles the land runs from 6,050 ft to 7,580 ft, a difference of 1,530 ft: steep hill country. The highest named summit within 15 miles is Smiley Mountain, about 11,460 ft, 10 miles west.
Under the town center the state geologic map shows Glacial deposits (coarse-detrital, fine-detrital), from the Pleistocene, 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 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.
Dacite, andesite, rhyolite. Age: Eocene, 34 to 56 million years old. About 18 mi of the line.
Gravel. Age: Quaternary, less than 2.6 million years old. About 4 mi of the line.
Coarse-detrital, fine-detrital. Age: Pleistocene, less than 2.6 million years old. About 2 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.
Lost River has a dry-summer warm-summer continental climate. Summer afternoons average 81° in July; winter nights fall to about 7° in January. A normal year brings about 80 inches of snow; with the rain, that comes to about 15 inches of water.
On November 14 Lost River normally reaches 37° and falls to 16°. The record high is 60°, in 1999; the record low 3°, in 1959. The most rain on this date, 0.81 in, fell in 1965.
Normals 1991–2020 and records since 1958 at Craters Of The Moon, 16 miles south, 270 ft lower. NOAA, through RCC-ACIS.
