The Wellton 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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93° on Nov. 12, 1973, the hottest reading for this week of the year since 1955. Next is 93° in 1999.
Wellton’s center stands about 320 ft above sea level. Within three miles the land runs from 200 ft to 490 ft, a difference of 290 ft: rolling country. The highest named summit within 15 miles is Sheep Mountain, about 3,030 ft, 7 miles south.
Under the town center the state geologic map shows Quaternary surficial deposits, undivided (sand, silt, clay), from the Pleistocene to Holocene, less than 2 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 8×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Volcanic, clastic. Age: Early Oligocene to Late Miocene, 11 to 32 million years old. About 7 mi of the line.
Sand, silt, clay. Age: Pleistocene to Holocene, less than 2 million years old. About 5 mi of the line.
Granite. Age: Late Cretaceous to Early Eocene, 50 to 80 million years old. About 5 mi of the line.
Sand, gravel. Age: Holocene, less than 10,000 years old. About 3 mi of the line.
Gravel, sand. Age: Late Pliocene to Pleistocene, 0.8 to 3 million years old. About 2 mi of the line.
Metasedimentary, metavolcanic, gneiss. Age: Paleoproterozoic, 1.6 to 1.8 billion years old. About 0.7 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 Wellton reaches the Gulf of California by way of the Gila and the Colorado: about 150 river miles.
120 miles of the trip are on the Colorado.
Often dry. About 30% of the way is mapped as streams that run only after rain or snowmelt; the water makes the whole trip in floods.
Seldom reaches the sea. Dams and canals now take nearly all of the Colorado before its old delta in Mexico.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Wellton; river miles along the main stem, rounded.
Wellton has a hot desert climate. Summer afternoons average 107° in July; winter nights fall to about 43° in December. About 4 inches of rain fall in a normal year.
On November 14 Wellton normally reaches 78° and falls to 52°. The record high is 91°, in 1999; the record low 38°, in 2000. The most rain on this date, 0.81 in, fell in 1993.
Normals 1991–2020 and records since 1955 at Yuma Proving Ground, 17 miles northwest. NOAA, through RCC-ACIS.
