The Theba 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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97° on Nov. 11, 1934, the hottest reading for this week of the year since 1892. Next is 94° in 1999.
Theba’s center stands about 730 ft above sea level. Within three miles the land runs from 710 ft to 790 ft, a difference of 80 ft: gently rolling country. The highest named summit within 15 miles is Lookout Mountain, about 2,500 ft, 14 miles south-southeast.
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 6 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 34×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Sand, silt, clay. Age: Pleistocene to Holocene, less than 2 million years old. About 15 mi of the line.
Metasedimentary, metavolcanic, gneiss. Age: Paleoproterozoic, 1.6 to 1.8 billion years old. About 3 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.
Gravel, sand. Age: Pleistocene, less than 0.8 million years old. About 0.8 mi of the line.
Basalt, andesite, dacite. Age: Middle Eocene to Late Miocene, 11 to 38 million years old. About 0.2 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale.
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 Theba reaches the Gulf of California by way of the Gila and the Colorado: about 260 river miles.
130 miles of the trip are on the Gila.
Often dry. About 70% 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 Theba; river miles along the main stem, rounded.
Theba has a hot desert climate. Summer afternoons average 109° in July; winter nights fall to about 40° in December. About 6 inches of rain fall in a normal year.
On November 14 Theba normally reaches 80° and falls to 48°. The record high is 93°, in 1999; the record low 23°, in 1916. The most rain on this date, 0.60 in, fell in 1899.
Normals 1991–2020 and records since 1892 at Gila Bend 2 SE, 12 miles east. NOAA, through RCC-ACIS.
