The Davenport 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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62° on Nov. 13, 1990, the hottest reading for this week of the year since 1893. Next is 62° in 1999.
Davenport’s center stands about 2,390 ft above sea level. Within three miles the land runs from 2,340 ft to 2,530 ft, a difference of 190 ft: gently rolling country. The highest named summit within 15 miles is Hanning Butte, about 3,040 ft, 13 miles east-southeast.
Under the town center the state geologic map shows Miocene volcanic rocks (basalt), from the Late Oligocene to Early Pliocene, 3.6 to 28 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 14×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Silt. Age: Pleistocene, less than 2.6 million years old. About 13 mi of the line.
Basalt. Age: Late Oligocene to Early Pliocene, 3.6 to 28 million years old. About 8 mi of the line.
Sand, gravel. Age: Pleistocene, less than 2.6 million years old. About 2 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 Davenport reaches the Pacific Ocean by way of Cottonwood Creek, Hawk Creek and the Columbia: about 650 river miles.
Lake on the way: Lake Umatilla.
350 miles of the trip are on the Columbia.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Davenport; river miles along the main stem, rounded.
Davenport has a dry-summer warm-summer continental climate. Summer afternoons average 82° in July; winter nights fall to about 19° in January. A normal year brings about 30 inches of snow; with the rain, that comes to about 14 inches of water.
On November 14 Davenport normally reaches 42° and falls to 25°. The record high is 57°, in 1995; the record low −3°, in 1955. The most rain on this date, 0.68 in, fell in 2024.
Normals 1991–2020 and records since 1893 at Davenport, here. NOAA, through RCC-ACIS.
