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Upper Humboldt Plains

Ecoregion in Great Basin, NV

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The Upper Humboldt Plains ecoregion is an area of rolling plains punctuated by occasional buttes and low mountains. It is mostly underlain by volcanic ash, rhyolite, and tuffaceous rocks. Low sagebrush is common in extensive areas of shallow, stony soil, as are cool season grasses, such as bluebunch wheatgrass, Idaho fescue, and Sandberg bluegrass. The Upper Humboldt Plains ecoregion (13m) is wetter and cooler than other Nevada ecoregions in its elevation range. Ecoregion 13m is transitional to the Northern Basin and Range (80) that spans the Nevada – Oregon border. However, as in the warmer Lahontan Basin to the west, lightning fires are common and a post-fire monoculture of cheatgrass tends to replace the native grasses and shrubs. Grazing is the major land use, though there is some agriculture near the Humboldt River.

— EPA

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