The Tetonia 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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65° on Nov. 16, 1999, the hottest reading for this week of the year since 1949. Next is 62° in 1954.
Tetonia’s center stands about 6,050 ft above sea level. Within three miles the land runs from 5,950 ft to 6,350 ft, a difference of 400 ft: rolling country. The highest named summit within 15 miles is Littles Peak, about 10,650 ft, 14 miles east.
Under the town center the state geologic map shows Alluvial-fan deposits (gravel), from the Quaternary, less than 2.6 million years old.
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 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.
Coarse-detrital, fine-detrital. Age: Pleistocene, less than 2.6 million years old. About 7 mi of the line.
Basalt. Age: Late Pliocene to Pleistocene, less than 3 million years old. About 5 mi of the line.
Rhyolite. Age: Pleistocene, 0.6 to 2 million years old. About 4 mi of the line.
Gravel. Age: Quaternary, less than 2.6 million years old. About 3 mi of the line.
Gravel, sand, silt. Age: Quaternary, less than 2.6 million years old. About 2 mi of the line.
Rhyolite. Age: Pliocene, 2.6 to 5.3 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. 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 Tetonia reaches the Pacific Ocean by way of the Teton, the Henrys Fork, the Snake and the Columbia: about 1,220 river miles.
Lakes on the way: American Falls Reservoir, Lake Umatilla, Brownlee Reservoir and Cove Arm Lake.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Tetonia; river miles along the main stem, rounded.
Tetonia has a warm-summer humid continental climate. Summer afternoons average 78° in July; winter nights fall to about 8° in January. About 19 inches of rain fall in a normal year.
On November 14 Tetonia normally reaches 39° and falls to 19°. The record high is 62°, in 1999; the record low −7°, in 2014. The most rain on this date, 0.76 in, fell in 1983.
Normals 1991–2020 and records since 1949 at Tetonia Experiment Station, 7 miles west-northwest, 120 ft higher. NOAA, through RCC-ACIS.
