The Oak Grove 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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71° on Nov. 13, 1999, the hottest reading for this week of the year since 1872. Next is 68° in 1976.
Oak Grove’s center stands about 200 ft above sea level. Within three miles the land runs from 0 ft to 710 ft, a difference of 710 ft: hilly country. The highest named summit within 15 miles is Parrett Mountain, about 1,280 ft, 14 miles west-southwest.
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 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.
Basalt. Age: Miocene, 5.3 to 23 million years old. About 6 mi of the line.
Clay, silt, sand. Age: Pleistocene, less than 2.6 million years old. About 5 mi of the line.
Basaltic-andesite, basalt. Age: Early Pliocene to Pleistocene, 1.2 to 3.9 million years old. About 5 mi of the line.
Sandstone-mudstone. Age: Pliocene to Pleistocene, less than 5.3 million years old. About 4 mi of the line.
Gravel, boulders, clay. Age: Pleistocene to Holocene, less than 2.6 million years old. About 1 mi of the line.
Sand, gravel, silt. Age: Holocene, less than 12,000 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. 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 Oak Grove reaches the Pacific Ocean by way of Forest Creek, the Willamette and the Columbia: about 120 river miles.
100 miles of the trip are on the Columbia.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Oak Grove; river miles along the main stem, rounded.
Oak Grove has a warm-summer Mediterranean climate. Summer afternoons average 81° in August; winter nights fall to about 37° in January. About 44 inches of rain fall in a normal year, with about 4 inches of snow.
On November 14 Oak Grove normally reaches 53° and falls to 42°. The record high is 66°, in 2001; the record low 18°, in 1955. The most rain on this date, 2.18 in, fell in 1876.
Normals 1991–2020 and records since 1872 from the Portland Downtown Area threaded record (Portland Kgw-Tv, 8 miles north-northwest). NOAA, through RCC-ACIS.
