Geologist outlines Snake River's geologic controls and implications for trails, erosion and development
A geologic overview of the Snake River watershed explained how bedrock and glacial history shape river behavior, bank erosion and flood risks — information county staff said is relevant to trail and bridge siting and shoreline management.
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Carrie Jennings (Speaker 11), a geologist who previously prepared a Pine County geologic atlas, gave commissioners a technical briefing linking bedrock geology, glacial deposits and modern river behavior. Jennings described billion‑year‑old basalt and sandstone units, glacial sublobe deposits and subglacial drainages that control sediment distribution, and she explained how these factors translate into reaches prone to erosion, bluff formation and differing flood responses.
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