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Forested Beaverhead Mountains
Ecoregion
in
Beaverhead NF
,
Bitterroot Range
,
Rocky Mountains
in
MT
,
ID
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The glaciated, Forested Beaverhead Mountains ecoregion is characterized by pothole lakes, drift deposits, boggy areas, and gentle lower slopes. Ecoregion 17ae is underlain by Precambrian argillite, quartzite, argillaceous rocks, carbonates, and shales. It is lithologically distinct from the carbonate-rich Barren Mountains (17e) as well as from ecoregions that are underlain by intrusive rocks, including the Eastern Batholith (16a) and Glaciated Bitterroot Mountains and Canyons (16e). Climax vegetation is mapped as subalpine fir and Douglas-fir forests. Ecoregion 17ae receives an average annual precipitation of 20 to just over 40 inches; maximums are much greater north of the Continental Divide in Ecoregion 16e where the climax vegetation is also different. Streams are typically low in turbidity except during high discharge events which accompany thunderstorms and spring snow melt. Grazing, mining, recreation, and logging are the principal land uses.
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