The Lower Santan Village 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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96° on Nov. 13, 1999, the hottest reading for this week of the year since 1906. Next is 94° in 1953.
Lower Santan Village’s center stands about 1,230 ft above sea level. Within three miles the land runs from 1,180 ft to 1,420 ft, a difference of 240 ft: rolling country. The highest named summit within 15 miles is Santan Mountain, about 3,020 ft, 5 miles east-northeast.
The section below crosses 5 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 12×. 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, gravel. Age: Holocene, less than 10,000 years old. About 11 mi of the line.
Silt, clay. Age: Holocene, less than 10,000 years old. About 7 mi of the line.
Metasedimentary, schist. Age: Paleoproterozoic, 1.6 to 1.8 billion years old. About 4 mi of the line.
Granite, granodiorite, tonalite. Age: Paleoproterozoic, 1.6 to 1.8 billion years old. About 1 mi of the line.
Sand, silt, clay. Age: Pleistocene to Holocene, less than 2 million 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.
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 Lower Santan Village reaches the Gulf of California by way of the Gila and the Colorado: about 370 river miles.
250 miles of the trip are on the Gila.
Often dry. About 60% 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 Lower Santan Village; river miles along the main stem, rounded.
Lower Santan Village has a hot desert climate. Summer afternoons average 107° in July; winter nights fall to about 36° in December. About 8 inches of rain fall in a normal year.
On November 14 Lower Santan Village normally reaches 79° and falls to 44°. The record high is 93°, in 1999; the record low 27°, in 1993. The most rain on this date, 1.36 in, fell in 1968.
Normals 1991–2020 and records since 1906 at Casa Grande Natl Monument, 18 miles southeast, 190 ft higher. NOAA, through RCC-ACIS.
