The Easton 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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12° on Nov. 14, 2014, the coldest reading for this week of the year since 1905. Next is 21° in 2012.
Easton’s center stands about 2,170 ft above sea level. Within three miles the land runs from 2,100 ft to 4,430 ft, a difference of 2,330 ft: mountain country. The highest named summit within 15 miles is Hibox Mountain, about 6,380 ft, 15 miles north-northwest.
The section below crosses 6 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.
Arkose. Age: Eocene to Early Oligocene, 28 to 56 million years old. About 7 mi of the line.
Phyllite. Age: Jurassic to Early Cretaceous, 100 to 202 million years old. About 5 mi of the line.
Silt, sand. Age: Holocene, less than 12,000 years old. About 4 mi of the line.
Schist. Age: Triassic to Early Cretaceous, 100 to 252 million years old. About 2 mi of the line.
Gneiss. Age: Precambrian to Eocene. About 2 mi of the line.
Andesite. Age: Oligocene to Middle Miocene, 12 to 34 million years old. About 0.5 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 Easton reaches the Pacific Ocean by way of the Yakima and the Columbia: about 530 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 Easton; river miles along the main stem, rounded.
Easton has a dry-summer warm-summer continental climate. Summer afternoons average 76° in July; winter nights fall to about 25° in January. About 50 inches of rain fall in a normal year.
Normals 1991–2020 and records since 1905 at Easton, here. NOAA, through RCC-ACIS.
