The Nespelem 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. 14, 2021, the hottest reading for this week of the year since 1934. Next is 62° in 1953.
Nespelem’s center stands about 1,870 ft above sea level. Within three miles the land runs from 1,720 ft to 2,740 ft, a difference of 1,020 ft: steep hill country. The highest named summit within 15 miles is Moses Mountain, about 6,750 ft, 15 miles north-northwest.
Under the town center the state geologic map shows Glaciolacustrine deposits (silt, sand), from the Pleistocene, less than 2.6 million years old.
The section below crosses 5 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 6×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Andesite, basalt. Age: Eocene to Oligocene, 23 to 56 million years old. About 11 mi of the line.
Silt, sand. Age: Pleistocene, less than 2.6 million years old. About 7 mi of the line.
Sand, gravel. Age: Pleistocene, less than 2.6 million years old. About 4 mi of the line.
Basalt. Age: Late Oligocene to Early Pliocene, 3.6 to 28 million years old. About 1 mi of the line.
Granite. Age: Precambrian to Eocene. About 0.3 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 Nespelem reaches the Pacific Ocean by way of the Nespelem and the Columbia: about 580 river miles.
Lake on the way: Lake Umatilla.
300 miles of the trip are on the Columbia.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Nespelem; river miles along the main stem, rounded.
Nespelem has a cold semi-arid climate. Summer afternoons average 88° in July; winter nights fall to about 23° in January. About 11 inches of rain fall in a normal year.
On November 14 Nespelem normally reaches 43° and falls to 31°. The record high is 63°, in 2021; the record low 1°, in 1955. The most rain on this date, 0.55 in, fell in 1963.
Normals 1991–2020 and records since 1934 at Coulee Dam 1 SW, 15 miles south, 150 ft lower. NOAA, through RCC-ACIS.
