The Hailey 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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68° on Nov. 15, 1999, the hottest reading for this week of the year since 1937. Next is 66° in 2016.
Hailey’s center stands about 5,330 ft above sea level. Within three miles the land runs from 5,240 ft to 6,850 ft, a difference of 1,610 ft: steep hill country. The highest named summit within 15 miles is Johnstone Peak, about 9,880 ft, 14 miles north-northeast.
Under the town center the state geologic map shows Alluvial deposits (gravel, sand, silt), from the Quaternary, less than 2.6 million years old.
The section below crosses 6 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.
Age: Carboniferous to Permian, 252 to 324 million years old. About 10 mi of the line.
Gravel, sand, silt. Age: Quaternary, less than 2.6 million years old. About 4 mi of the line.
Tonalite, granodiorite, quartz-diorite. Age: Late Cretaceous, 70 to 100 million years old. About 4 mi of the line.
Dolostone, limestone, sandstone. Age: Ordovician to Devonian, 359 to 487 million years old. About 3 mi of the line.
Dacite, andesite, rhyolite. Age: Eocene, 34 to 56 million years old. About 3 mi of the line.
Basalt. Age: Middle Miocene to Late Pliocene, 3 to 15 million years old. About 0.5 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 Hailey reaches the Pacific Ocean by way of the Big Wood, the Malad, the Snake and the Columbia: about 980 river miles.
Lakes on the way: Lake Umatilla, Brownlee Reservoir, Cove Arm Lake and Magic Reservoir.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Hailey; river miles along the main stem, rounded.
Hailey has a dry-summer warm-summer continental climate. Summer afternoons average 80° in July; winter nights fall to about 8° in January. A normal year brings about 102 inches of snow; with the rain, that comes to about 17 inches of water.
On November 14 Hailey normally reaches 42° and falls to 18°. The record high is 65°, in 1999; the record low −6°, in 1964. The most rain on this date, 0.82 in, fell in 1988.
Normals 1991–2020 and records since 1937 at Ketchum Ranger Station, 12 miles north, 560 ft higher. NOAA, through RCC-ACIS.
