The Grangeville 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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72° on Nov. 12, 1999, the hottest reading for this week of the year since 1893. Next is 67° in 1990.
Grangeville’s center stands about 3,400 ft above sea level. Within three miles the land runs from 3,120 ft to 4,370 ft, a difference of 1,250 ft: steep hill country. The highest named summit within 15 miles is Corral Hill, about 5,950 ft, 15 miles east.
Under the town center the state geologic map shows Columbia River Basalt Group (basalt, basaltic-andesite), from the Early Miocene to Late Miocene, 6 to 18 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 5×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Basalt, basaltic-andesite. Age: Early Miocene to Late Miocene, 6 to 18 million years old. About 21 mi of the line.
Tonalite, trondhjemite. Age: Early Cretaceous, 110 to 120 million years old. About 2 mi of the line.
Quartz-diorite. Age: Late Jurassic to Late Cretaceous, 90 to 160 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.
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 Grangeville reaches the Pacific Ocean by way of Threemile Creek, the South Fork Clearwater, the Clearwater, the Snake and the Columbia: about 550 river miles.
Lake on the way: Lake Umatilla.
210 miles of the trip are on the Columbia.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Grangeville; river miles along the main stem, rounded.
Grangeville has a warm-summer humid continental climate. Summer afternoons average 83° in August; winter nights fall to about 24° in December. A normal year brings about 39 inches of snow; with the rain, that comes to about 24 inches of water.
On November 14 Grangeville normally reaches 45° and falls to 30°. The record high is 67°, in 1999; the record low −15°, in 1955. The most rain on this date, 0.80 in, fell in 1903.
Normals 1991–2020 and records since 1893 at Grangeville, here. NOAA, through RCC-ACIS.
