The East Basin 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. 17, 2000, the coldest reading for this week of the year since 1992. Next is 3° in 1997.
East Basin’s center stands about 6,510 ft above sea level. Within three miles the land runs from 6,370 ft to 7,090 ft, a difference of 720 ft: hilly country. The highest named summit within 15 miles is Twin Peaks, about 11,430 ft, 15 miles southwest.
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 4×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Andesite. Age: Late Eocene to Oligocene, 23 to 38 million years old. About 5 mi of the line.
Mudstone, conglomerate. Age: Late Paleocene to Early Eocene, 48 to 59 million years old. About 5 mi of the line.
Unconsolidated. Age: Quaternary, less than 2.6 million years old. About 4 mi of the line.
Granodiorite. Age: Middle Eocene to Early Oligocene, 30 to 42 million years old. About 3 mi of the line.
Unconsolidated. Age: Pleistocene, less than 2.6 million years old. About 2 mi of the line.
Arenite. Age: Early Jurassic, 175 to 202 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 East Basin reaches Great Salt Lake by way of Silver Creek and the Weber: about 95 river miles. Great Salt Lake has no outlet to the sea: the water leaves only by evaporating or soaking into the ground.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of East Basin; river miles along the main stem, rounded.
East Basin has a warm-summer humid continental climate. Summer afternoons average 80° in July; winter nights fall to about 16° in January. About 22 inches of rain fall in a normal year.
Normals 1991–2020 and records since 1992 at Park City, 5 miles south, 390 ft higher. NOAA, through RCC-ACIS.
