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Geologist outlines how Pine County’s ancient bedrock and glacial history shape Snake River behavior and land‑use risks
Summary
A county geologist told commissioners that Pine County’s bedrock and glacial history — including ancient basalt, sandstones and large subglacial drainage events — continues to control where the Snake River meanders, forms rapids and creates eroding bluffs, with implications for shoreline development, trails and water quality.
A geologist who mapped Pine County’s bedrock and glacial deposits told the county board that ancient bedrock, repeated glaciations and large subglacial drainage events fundamentally control the Snake River’s course, gradients and erosion behavior — findings that matter for shoreline development, trail planning and water‑quality work. Carrie Jennings, who prepared a county geologic atlas years earlier and conducted a Snake River presentation, explained how ~1.1 billion‑year‑old basalt flows, uplifted sandstones and much younger glacial…
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