The Gannett 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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67° on Nov. 13, 2016, the hottest reading for this week of the year since 1958. Next is 66° in 1999.
Gannett’s center stands about 4,920 ft above sea level. Within three miles the land runs from 4,870 ft to 6,120 ft, a difference of 1,250 ft: steep hill country. The highest named summit within 15 miles is Patterson Peak, about 8,320 ft, 12 miles north-northwest.
Under the town center the state geologic map shows Sediments and sedimentary rocks (Pleistocene and Pliocene) (gravel, sand, silt), from the Pliocene to Pleistocene, less than 5.3 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 6×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Age: Carboniferous to Permian, 252 to 324 million years old. About 8 mi of the line.
Basalt. Age: Late Pliocene to Pleistocene, less than 3 million years old. About 5 mi of the line.
Dacite, andesite, rhyolite. Age: Eocene, 34 to 56 million years old. About 4 mi of the line.
Gravel, sand, silt. Age: Pliocene to Pleistocene, less than 5.3 million years old. About 4 mi of the line.
Tonalite, granodiorite, quartz-diorite. Age: Late Cretaceous, 70 to 100 million years old. About 2 mi of the line.
Rhyolite. Age: Middle Miocene to Late Miocene, 8 to 14 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 Gannett reaches the Pacific Ocean by way of Loving Creek, Silver Creek, the Little Wood, the Malad, the Snake and the Columbia: about 1,000 river miles.
Lakes on the way: Lake Umatilla, Brownlee Reservoir, Cove Arm Lake and Hells Canyon Reservoir.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Gannett; river miles along the main stem, rounded.
Gannett has a dry-summer warm-summer continental climate. Summer afternoons average 87° in July; winter nights fall to about 7° in January. A normal year brings about 46 inches of snow; with the rain, that comes to about 13 inches of water.
On November 14 Gannett normally reaches 45° and falls to 19°. The record high is 65°, in 1999; the record low −4°, in 1964. The most rain on this date, 1.00 in, fell in 2020.
Normals 1991–2020 and records since 1958 at Picabo, 7 miles east-southeast. NOAA, through RCC-ACIS.
