The Antelope 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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−6° on Nov. 16, 2014, the coldest reading for this week of the year since 1924. Next is −4° in 1955.
Antelope’s center stands about 2,680 ft above sea level. Within three miles the land runs from 2,520 ft to 3,580 ft, a difference of 1,060 ft: steep hill country. The highest named summit within 15 miles is Tompkins Butte, about 4,680 ft, 14 miles south-southeast.
Under the town center the state geologic map shows John Day Formation of east-central Oregon (sandstone-mudstone), from the Late Eocene to Early Miocene, 16 to 38 million years old.
The section below crosses 4 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 7×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Sandstone-mudstone. Age: Late Eocene to Early Miocene, 16 to 38 million years old. About 8 mi of the line.
Basalt. Age: Early Miocene to Middle Miocene, 12 to 23 million years old. About 8 mi of the line.
Coarse-detrital. Age: Pleistocene to Holocene, less than 2.6 million years old. About 6 mi of the line.
Basalt. Age: Miocene, 5.3 to 23 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 Antelope reaches the Pacific Ocean by way of Antelope Creek, Trout Creek, the Deschutes and the Columbia: about 320 river miles.
200 miles of the trip are on the Columbia.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Antelope; river miles along the main stem, rounded.
Antelope has a warm-summer Mediterranean climate. Summer afternoons average 87° in July; winter nights fall to about 24° in December. A normal year brings about 10 inches of snow; with the rain, that comes to about 14 inches of water.
On November 14 Antelope normally reaches 50° and falls to 30°. The record high is 72°, in 1999; the record low 0°, in 1955. The most rain on this date, 0.60 in, fell in 1988.
Normals 1991–2020 and records since 1924 at Antelope 6 SSW, 6 miles south-southwest, 350 ft higher. NOAA, through RCC-ACIS.
