The Iyanbito 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.
Chance of showers
Mostly sunny
Mostly sunny
Showers likely
Mostly sunny; cooler
Partly cloudy
Chance of showers; cooler
2° on Nov. 12, 2000, the coldest reading for this week of the year since 1973. Next is 2° in 2018.
Iyanbito’s center stands about 6,950 ft above sea level. Within three miles the land runs from 6,770 ft to 7,790 ft, a difference of 1,020 ft: steep hill country. The highest named summit within 15 miles is Mount Powell, about 8,730 ft, 14 miles east-southeast.
Under the town center the state geologic map shows Chinle Group (sandstone, mudstone, conglomerate), from the Middle Triassic to Late Triassic, 202 to 247 million years old.
The section below crosses 13 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.
Sandstone, mudstone, conglomerate. Age: Middle Triassic to Late Triassic, 202 to 247 million years old. About 6 mi of the line.
Sandstone, shale. Age: Late Jurassic, 145 to 164 million years old. About 3 mi of the line.
Shale, limestone. Age: Late Cretaceous, 90 to 100 million years old. About 3 mi of the line.
Unconsolidated. Age: Pleistocene to Holocene, less than 0.1 million years old. About 3 mi of the line.
Shale, sandstone. Age: Late Cretaceous, 84 to 90 million years old. About 2 mi of the line.
Sandstone, siltstone. Age: Middle Jurassic, 164 to 175 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. 7 smaller units 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 Iyanbito reaches the Gulf of California by way of the South Fork Puerco, the Puerco, the Little Colorado and the Colorado: about 1,080 river miles.
Lakes on the way: Lake Mead, Lake Mohave and Lake Havasu.
290 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.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Iyanbito; river miles along the main stem, rounded.
Iyanbito has a cold semi-arid climate. Summer afternoons average 89° in July; winter nights fall to about 14° in January. A normal year brings about 34 inches of snow; with the rain, that comes to about 11 inches of water.
On November 14 Iyanbito normally reaches 56° and falls to 20°. The record high is 73°, in 1999; the record low 4°, in 2000. The most rain on this date, 0.44 in, fell in 1997.
Normals 1991–2020 and records since 1973 at Gallup Municipal Airport, 18 miles west, 490 ft lower. NOAA, through RCC-ACIS.
