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Eastern Batholith

Ecoregion in Rocky Mountains in MT, ID

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The Eastern Batholith ecoregion is forested and mountainous and lies northwest of the Continental Divide. Characteristically, Ecoregion 16a is underlain by intrusive rocks of the Cretaceous Idaho Batholith and, in consequence, its surface waters are very low in alkalinity. The Eastern Batholith (16a) ecoregion is lithologically distinct from the Precambrian Belt rocks of Ecoregion 17x and lacks the nearly parallel, ice-gouged valleys and numerous lakes and wetlands of the Glaciated Bitterroot Mountains and Canyons (16e). Average annual precipitation ranges from 16 to 55 inches; maximums are less than those of Ecoregion 16e but more than those southeast of the Continental Divide in the Forested Beaverhead Mountains (17ae) or the Pioneer-Anaconda Ranges (17ag). The climax vegetation is subalpine fir, Douglas- fir, and ponderosa pine and is different from that of the Forested Beaverhead Mountains (17ae) or Pioneer-Anaconda Ranges (17ag) which lack the mapped ponderosa pine element. Logging, grazing, mining, and recreation are common land uses.

— EPA

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