The Bancroft 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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Bancroft’s center stands about 5,420 ft above sea level. Within three miles the land runs from 5,380 ft to 6,080 ft, a difference of 700 ft: hilly country. The highest named summit within 15 miles is Bonneville Peak, about 9,250 ft, 13 miles west-northwest.
Under the town center the state geologic map shows Alluvial-fan deposits (gravel), from the Quaternary, less than 2.6 million years old.
The section below crosses 7 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 6×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Mixed-clastic, volcanic. Age: Early Miocene to Pleistocene, 2 to 16 million years old. About 6 mi of the line.
Basalt. Age: Late Pliocene to Pleistocene, less than 3 million years old. About 4 mi of the line.
Age: Carboniferous, 324 to 359 million years old. About 3 mi of the line.
Dolostone, limestone, sandstone. Age: Ordovician to Devonian, 359 to 487 million years old. About 3 mi of the line.
Gravel. Age: Quaternary, less than 2.6 million years old. About 3 mi of the line.
Limestone, dolostone. Age: Cambrian to Ordovician, 445 to 542 million years old. About 3 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 1 smaller unit 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 Bancroft reaches the Pacific Ocean by way of the Portneuf, the Snake and the Columbia: about 1,130 river miles.
Lakes on the way: American Falls Reservoir, Lake Umatilla, Brownlee Reservoir and Cove Arm Lake.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Bancroft; river miles along the main stem, rounded.
