The Halls Crossing 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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77° on Nov. 11, 2014, the hottest reading for this week of the year since 1967. Next is 75° in 1973.
Halls Crossing’s center stands about 4,010 ft above sea level. Within three miles the land runs from 3,630 ft to 4,160 ft, a difference of 530 ft: hilly country. The highest named summit within 15 miles is Wilson Mesa, about 4,890 ft, 12 miles south.
The section below crosses 4 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 10×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Arenite. Age: Early Jurassic, 175 to 202 million years old. About 12 mi of the line.
Sandstone. Age: Middle Jurassic to Late Jurassic, 145 to 175 million years old. About 6 mi of the line.
Sand. Age: Quaternary, less than 2.6 million years old. About 4 mi of the line.
Coarse-detrital. Age: Quaternary, less than 2.6 million years old. About 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 Halls Crossing reaches the Gulf of California by way of Lake Powell and the Colorado: about 890 river miles.
Lakes on the way: Lake Mead, Lake Powell, Lake Mohave and Lake Havasu.
290 miles of the trip are on the Colorado.
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 Halls Crossing; river miles along the main stem, rounded.
Halls Crossing has a cold desert climate. Summer afternoons average 100° in July; winter nights fall to about 26° in January. About 6 inches of rain fall in a normal year, with about 4 inches of snow.
On November 14 Halls Crossing normally reaches 59° and falls to 34°. The record high is 74°, in 1989; the record low 25°, in 2018. The most rain on this date, 0.10 in, fell in 1988.
Normals 1991–2020 and records since 1967 at Bullfrog Basin, 5 miles north-northwest, 190 ft lower. NOAA, through RCC-ACIS.
