The Ash Fork 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.
Ash Fork’s center stands about 5,140 ft above sea level. Within three miles the land runs from 5,030 ft to 5,430 ft, a difference of 400 ft: hilly country. The highest named summit within 15 miles is Bixler Mountain, about 8,380 ft, 14 miles east.
Under the town center the state geologic map shows Pliocene to late Miocene basaltic rocks, from the Late Miocene to Early Pliocene, 4 to 8 million years old.
The section below crosses 3 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.
Basalt. Age: Late Miocene to Early Pliocene, 4 to 8 million years old. About 17 mi of the line.
Gravel, sand. Age: Late Pliocene to Pleistocene, 0.8 to 3 million years old. About 6 mi of the line.
Sandstone, limestone. Age: Permian, 270 to 280 million years old. About 1 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 Ash Fork reaches the Gulf of California by way of Partridge Creek, Big Chino Wash, the Verde, the Salt River, the Gila and the Colorado: about 610 river miles.
200 miles of the trip are on the Gila.
Often dry. About 50% 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 Ash Fork; river miles along the main stem, rounded.