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Treasure Valley

Ecoregion on Columbia Plateau in ID, OR

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The Treasure Valley ecoregion has irrigated cropland, pastureland, and rapidly growing cities, suburbs, and industries. Many canals, reservoirs, and diversions occur. Aridic soils predominate and require irrigation to grow commercial crops. Surface water quality has been significantly affected by channel alteration, dams, irrigation return flow, and urban, industrial, and agricultural pollution. Crops include wheat, barley, alfalfa, sugar beets, potatoes, and beans. Crop diversity is greater, temperatures are warmer, and the mean frost free season is longer than in Ecoregions 12e and 12i. Population density is much greater than in nearby, rangeland-dominated ecoregions.

— EPA

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Ecoregion