The Warm 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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69° on Nov. 11, 1934, the hottest reading for this week of the year since 1897. Next is 62° in 1897.
Warm River’s center stands about 5,570 ft above sea level. Within three miles the land runs from 5,290 ft to 6,480 ft, a difference of 1,190 ft: steep hill country. The highest named summit within 15 miles is Snow Creek Butte, about 7,730 ft, 14 miles northeast.
Under the town center the state geologic map shows Rhyolite (Pleistocene), from the Pleistocene, 0.6 to 2 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 10×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Rhyolite. Age: Pleistocene, 0.6 to 2 million years old. About 15 mi of the line.
Coarse-detrital, fine-detrital. Age: Pleistocene, less than 2.6 million years old. About 5 mi of the line.
Basalt. Age: Late Pliocene to Pleistocene, less than 3 million years old. About 4 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.
A raindrop that lands in Warm River reaches the Pacific Ocean by way of the Henrys Fork, the Snake and the Columbia: about 1,210 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 Warm River; river miles along the main stem, rounded.
Warm River has a dry-summer warm-summer continental climate. Summer afternoons average 83° in July; winter nights fall to about 13° in January. A normal year brings about 70 inches of snow; with the rain, that comes to about 20 inches of water.
On November 14 Warm River normally reaches 41° and falls to 23°. The record high is 63°, in 1934; the record low −4°, in 1956. The most rain on this date, 0.91 in, fell in 1991.
Normals 1991–2020 and records since 1897 at Ashton 1 N, 8 miles west-southwest, 360 ft lower. NOAA, through RCC-ACIS.
