The South Park 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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Chance of showers; cooler
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Showers likely
64° on Nov. 15, 1990, the hottest reading for this week of the year since 1905. Next is 63° in 1999.
South Park’s center stands about 6,060 ft above sea level. Within three miles the land runs from 5,970 ft to 7,910 ft, a difference of 1,940 ft: steep hill country. The highest named summit within 15 miles is Rendezvous Peak, about 10,840 ft, 11 miles north-northwest.
Under the town center the state geologic map shows Alluvium and Colluvium (clay, silt, sand), from the Pleistocene to Holocene, less than 2.6 million years old.
The section below crosses 12 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 5×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Limestone, sandstone. Age: Carboniferous to Permian, 252 to 359 million years old. About 4 mi of the line.
Clay, silt, sand. Age: Pleistocene to Holocene, less than 2.6 million years old. About 4 mi of the line.
Limestone, dolostone. Age: Late Devonian to Carboniferous, 324 to 384 million years old. About 3 mi of the line.
Shale, siltstone. Age: Early Cretaceous, 100 to 145 million years old. About 3 mi of the line.
Siltstone, shale. Age: Early Triassic to Late Triassic, 202 to 252 million years old. About 2 mi of the line.
Sandstone, siltstone. Age: Early Triassic to Jurassic, 145 to 252 million years old. About 2 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 6 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 South Park reaches the Pacific Ocean by way of Flat Creek, the Snake and the Columbia: about 1,260 river miles.
Lakes on the way: American Falls Reservoir, Palisades Reservoir, Lake Umatilla and Brownlee Reservoir.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of South Park; river miles along the main stem, rounded.
South Park has a warm-summer humid continental climate. Summer afternoons average 79° in July; winter nights fall to about 6° in January. A normal year brings about 78 inches of snow; with the rain, that comes to about 18 inches of water.
On November 14 South Park normally reaches 38° and falls to 16°. The record high is 62°, in 1999; the record low −12°, in 1922. The most rain on this date, 0.65 in, fell in 1983.
Normals 1991–2020 and records since 1905 at Jackson, 5 miles north-northeast, 150 ft higher. NOAA, through RCC-ACIS.
