The Indian Springs 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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Indian Springs’s center stands about 2,820 ft above sea level. Within three miles the land runs from 2,590 ft to 5,960 ft, a difference of 3,370 ft: mountain country. The highest named summit within 15 miles is Poorman Mountain, about 7,780 ft, 5 miles east-northeast.
Under the town center the state geologic map shows Glacial deposit (unconsolidated), from the Pleistocene to Holocene, less than 1.8 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 4×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Unconsolidated. Age: Pleistocene to Holocene, less than 1.8 million years old. About 8 mi of the line.
Quartzite, metasiltstone, argillite. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 7 mi of the line.
Metasiltstone, argillite, quartzite. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 3 mi of the line.
Quartzite, argillite, metasiltstone. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 2 mi of the line.
Basalt. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 1 mi of the line.
Metasiltstone, argillite. Age: Mesoproterozoic, 1 to 1.6 billion 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. 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 Indian Springs reaches the Pacific Ocean by way of DeRozier Creek, Indian Creek, the Tobacco, the Kootenai and the Columbia: about 900 river miles.
Lake on the way: Lake Umatilla.
460 miles of the trip are on the Columbia.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Indian Springs; river miles along the main stem, rounded.
