The Redrock 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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15° on Nov. 13, 2018, the coldest reading for this week of the year since 1905. Next is 17° in 1970.
Redrock’s center stands about 4,020 ft above sea level. Within three miles the land runs from 3,970 ft to 4,590 ft, a difference of 620 ft: hilly country. The highest named summit within 15 miles is Bullard Peak, about 7,030 ft, 12 miles east.
Under the town center the state geologic map shows Gila Group, Formation, or Conglomerate (conglomerate-sandstone, volcanic), from the Late Oligocene to Pleistocene, 0.1 to 28 million years old.
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 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.
Conglomerate-sandstone, volcanic. Age: Late Oligocene to Pleistocene, 0.1 to 28 million years old. About 19 mi of the line.
Pelitic-schist, muscovite-schist, quartzite. Age: Paleoproterozoic, 1.6 to 2.5 billion years old. About 2 mi of the line.
Basaltic-andesite, andesite. Age: Late Oligocene to Early Miocene, 22 to 26 million years old. About 2 mi of the line.
Andesite, latite. Age: Middle Eocene to Early Oligocene, 33 to 43 million years old. About 0.7 mi of the line.
Granitic, syenitic. Age: Eocene to Pliocene, 2.6 to 56 million years old. About 0.6 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 Redrock reaches the Gulf of California by way of the Gila and the Colorado: about 660 river miles.
530 miles of the trip are on the Gila.
Often dry. About 40% 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 Redrock; river miles along the main stem, rounded.
Redrock has a cold semi-arid climate. Summer afternoons average 96° in June; winter nights fall to about 24° in January. About 12 inches of rain fall in a normal year, with about 1 inch of snow.
On November 14 Redrock normally reaches 69° and falls to 31°. The record high is 83°, in 2025; the record low 17°, in 2018. The most rain on this date, 0.60 in, fell in 1968.
Normals 1991–2020 and records since 1905 at Redrock 1 NNE, here. NOAA, through RCC-ACIS.
