The Bonanza 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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Bonanza’s center stands about 5,440 ft above sea level. Within three miles the land runs from 5,120 ft to 5,760 ft, a difference of 640 ft: hilly country. The highest named summit within 15 miles is Rabbit Mountain, about 7,630 ft, 14 miles southeast.
Under the town center the state geologic map shows Alluvium and colluvium (unconsolidated), from the Quaternary, less than 2.6 million years old.
The section below crosses 6 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. Age: Middle Eocene to Early Oligocene, 28 to 48 million years old. About 12 mi of the line.
Unconsolidated. Age: Quaternary, less than 2.6 million years old. About 4 mi of the line.
Marlstone, shale. Age: Early Eocene to Middle Eocene, 38 to 56 million years old. About 4 mi of the line.
Shale, oil-shale. Age: Eocene, 34 to 56 million years old. About 2 mi of the line.
Shale, sandstone, marlstone. Age: Eocene, 34 to 56 million years old. About 2 mi of the line.
Claystone, shale, sandstone. Age: Eocene, 34 to 56 million years old. About 0.8 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 Bonanza reaches the Gulf of California by way of the White River, the Green River and the Colorado: about 1,280 river miles.
Lakes on the way: Lake Mead, Lake Powell, Lake Mohave and Lake Havasu.
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 Bonanza; river miles along the main stem, rounded.
