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St. Joe Schist-Gneiss Zone

Ecoregion in Rocky Mountains in ID, MT

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The St. Joe Schist – Gneiss Zone is mountainous, mantled by volcanic ash, and prone to landslides. Rocks are more weathered and slopes are more unstable than in Ecoregion 15o. High gradient streams dissect the region and receive episodic sedimentation from slides. Streams were used to transport logs to mills; log drives greatly altered aquatic ecosystems and stream morphology. Pacific influence is greater than to the south. Potential natural vegetation is mapped as cedar – hemlock – pine but hemlock is absent in the south. Near treeline, mountain hemlock, subalpine fir, Engelmann spruce, and whitebark pine occur.

— EPA

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