The Gervais 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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9° on Nov. 15, 1955, the coldest reading for this week of the year since 1894. Next is 18° in 1959.
Gervais’s center stands about 190 ft above sea level. Within three miles the land runs from 140 ft to 200 ft, a difference of 60 ft: nearly flat ground. The highest named summit within 15 miles is Parrett Mountain, about 1,280 ft, 14 miles north.
Under the town center the state geologic map shows Lacustrine and fluvial sedimentary rocks (clay, silt, sand), from the Pleistocene, less than 2.6 million years old.
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 21×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Clay, silt, sand. Age: Pleistocene, less than 2.6 million years old. About 12 mi of the line.
Sand, gravel, silt. Age: Holocene, less than 12,000 years old. About 4 mi of the line.
Sandstone-mudstone. Age: Pliocene to Pleistocene, less than 5.3 million years old. About 2 mi of the line.
Basalt. Age: Miocene, 5.3 to 23 million years old. About 2 mi of the line.
Gravel, boulders, clay. Age: Pleistocene to Holocene, less than 2.6 million years old. About 2 mi of the line.
Sandstone. Age: Oligocene to Early Miocene, 16 to 34 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 Gervais reaches the Pacific Ocean by way of the Pudding, the Willamette and the Columbia: about 170 river miles.
Lake on the way: Willamette Falls Hydroelectric Power Reservoir.
100 miles of the trip are on the Columbia.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Gervais; river miles along the main stem, rounded.
Gervais has a warm-summer Mediterranean climate. Summer afternoons average 83° in July; winter nights fall to about 34° in December. About 38 inches of rain fall in a normal year.
On November 14 Gervais normally reaches 53° and falls to 38°. The record high is 67°, in 1899; the record low 12°, in 1955. The most rain on this date, 3.75 in, fell in 1896.
Normals 1991–2020 and records since 1894 from the McMinnville Area threaded record (Mcminnville Municipal Airport, 13 miles west-northwest). NOAA, through RCC-ACIS.
