The Delta 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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−3° on Nov. 12, 2012, the coldest reading for this week of the year since 1965. Next is 3° in 2014.
Delta’s center stands about 4,640 ft above sea level. Within three miles the land runs from 4,600 ft to 4,720 ft, a difference of 120 ft: gently rolling country. The highest named summit within 15 miles is Sixmile Point, about 5,310 ft, 11 miles east-southeast.
Under the town center the state geologic map shows Alluvium and colluvium (unconsolidated), from the Quaternary, less than 2.6 million years old.
The section below crosses 2 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 23×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Unconsolidated. Age: Quaternary, less than 2.6 million years old. About 23 mi of the line.
Mixed-clastic, coarse-detrital. Age: Middle Miocene to Late Pliocene, 2.6 to 16 million years old. About 0.4 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 Delta reaches Sevier Lake by way of the Old Channel Sevier and the Sevier: about 75 river miles. Sevier Lake has no outlet to the sea: the water leaves only by evaporating or soaking into the ground.
Often dry. About 80% of the way is mapped as streams that run only after rain or snowmelt; the water makes the whole trip in floods.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Delta; river miles along the main stem, rounded.
Delta has a cold semi-arid climate. Summer afternoons average 95° in July; winter nights fall to about 15° in December. A normal year brings about 25 inches of snow; with the rain, that comes to about 8 inches of water.
On November 14 Delta normally reaches 52° and falls to 23°. The record high is 74°, in 1967; the record low 6°, in 2012. The most rain on this date, 0.34 in, fell in 1971.
Normals 1991–2020 and records since 1965 at Delta, here. NOAA, through RCC-ACIS.
