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Lower Grand Canyon

Ecoregion on Colorado Plateau, AZ

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The Lower Grand Canyon ecoregion is lower and warmer than the upstream Grand Canyon (22w) with larger areas having Mojave desert-scrub vegetation and Mojave Desert influences. Elevations here range from about 1300 feet to 6100 feet, and annual precipitation is 8 to 12 inches. Similar to Ecoregion 22w, extreme relief, rough topography, and a variety of exposed rock layers characterize the region. The soil temperature regime is thermic, with some hyperthermic at lowest elevations in the west, and the soil moisture regime is typic aridic. Although large areas are bare rock, the desert scrub contains creosotebush and white bursage, as well as some more frost-sensitive species such as brittlebush and ocotillo. Mesquite, willows, exotic tamarisk, catclaw acacia, and arrowweed are typical in riparian zones.

— EPA

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Ecoregion