The Addy 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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−5° on Nov. 17, 1903, the coldest reading for this week of the year since 1899. Next is 2° in 1916.
Addy’s center stands about 1,640 ft above sea level. Within three miles the land runs from 1,600 ft to 4,120 ft, a difference of 2,520 ft: mountain country. The highest named summit within 15 miles is Huckleberry Mountain, about 5,800 ft, 12 miles south-southwest.
Under the town center the state geologic map shows Alluvium (silt, sand), from the Holocene, less than 12,000 years old.
The section below crosses 9 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.
Sand, gravel. Age: Pleistocene, less than 2.6 million years old. About 9 mi of the line.
Argillite, siltstone. Age: Mesoproterozoic to Early Cambrian, 521 to 1,600 million years old. About 4 mi of the line.
Quartzite. Age: Neoproterozoic to Early Cambrian, 521 to 1,000 million years old. About 3 mi of the line.
Slate, argillite. Age: Early Ordovician to Middle Ordovician, 459 to 487 million years old. About 3 mi of the line.
Limestone, dolostone. Age: Early Cambrian to Middle Ordovician, 459 to 542 million years old. About 3 mi of the line.
Granite. Age: Precambrian to Eocene. 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. 3 smaller units along the line are not listed.
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 Addy reaches the Pacific Ocean by way of Addy Creek, the Colville and the Columbia: about 720 river miles.
Lake on the way: Lake Umatilla.
410 miles of the trip are on the Columbia.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Addy; river miles along the main stem, rounded.
Addy has a dry-summer warm-summer continental climate. Summer afternoons average 89° in August; winter nights fall to about 23° in January. A normal year brings about 43 inches of snow; with the rain, that comes to about 20 inches of water.
On November 14 Addy normally reaches 44° and falls to 29°. The record high is 58°, in 2015; the record low 6°, in 1916. The most rain on this date, 0.59 in, fell in 1921.
Normals 1991–2020 and records since 1899 at Colville 5 NE, 16 miles north. NOAA, through RCC-ACIS.
