The Amity 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.
Amity’s center stands about 160 ft above sea level. Within three miles the land runs from 130 ft to 870 ft, a difference of 740 ft: hilly country. The highest named summit within 15 miles is Stony Mountain, about 2,430 ft, 15 miles west-northwest.
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 7 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 15×. 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 8 mi of the line.
Sand, gravel, silt. Age: Holocene, less than 12,000 years old. About 5 mi of the line.
Mudstone. Age: Middle Eocene to Late Eocene, 34 to 48 million years old. About 5 mi of the line.
Basalt. Age: Early Miocene to Middle Miocene, 12 to 23 million years old. About 4 mi of the line.
Shale, siltstone. Age: Late Eocene to Oligocene, 23 to 38 million years old. About 1 mi of the line.
Gabbro. Age: Oligocene, 23 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. 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 Amity reaches the Pacific Ocean by way of the Ash Swale, Salt Creek, the South Yamhill, the Yamhill, the Willamette and the Columbia: about 190 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 Amity; river miles along the main stem, rounded.
Amity 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 Amity 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, 6 miles north-northeast). NOAA, through RCC-ACIS.
