The Venersborg 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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3.59 inches of rain fell in two days, the most for this week of the year since records began in 1928. The next wettest, 3.45 inches, fell in 1946.
Venersborg’s center stands about 580 ft above sea level. Within three miles the land runs from 260 ft to 1,470 ft, a difference of 1,210 ft: steep hill country. The highest named summit within 15 miles is Silver Star Mountain, about 4,340 ft, 12 miles east-southeast.
Under the town center the state geologic map shows Pliocene nonmarine rocks (conglomerate), from the Pliocene, 2.6 to 5.3 million years old.
The section below crosses 7 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.
Basalt, basaltic-andesite. Age: Late Eocene to Oligocene, 23 to 38 million years old. About 9 mi of the line.
Silt, sand. Age: Holocene, less than 12,000 years old. About 4 mi of the line.
Conglomerate. Age: Pliocene, 2.6 to 5.3 million years old. About 4 mi of the line.
Granodiorite, granite. Age: Early Paleocene to Middle Miocene, 12 to 66 million years old. About 2 mi of the line.
Andesite. Age: Pliocene to Pleistocene, less than 5.3 million years old. About 2 mi of the line.
Sandstone, clay, volcanic. Age: Pleistocene, less than 2.6 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. 1 smaller unit 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 Venersborg reaches the Pacific Ocean by way of Salmon Creek and the Columbia: about 110 river miles.
85 miles of the trip are on the Columbia.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Venersborg; river miles along the main stem, rounded.
Venersborg has a warm-summer Mediterranean climate. Summer afternoons average 80° in August; winter nights fall to about 32° in January. About 52 inches of rain fall in a normal year, with about 1 inch of snow.
On November 14 Venersborg normally reaches 52° and falls to 36°. The record high is 71°, in 1995; the record low 9°, in 1955. The most rain on this date, 1.77 in, fell in 1942.
Normals 1991–2020 and records since 1928 at Battle Ground, 3 miles west-southwest, 300 ft lower. NOAA, through RCC-ACIS.
