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Upper Snake River Plain

Ecoregion on Columbia Plateau, Rocky Mountains in ID

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The nearly level Upper Snake River Plain contains cropland, pastureland, cities, suburbs, and industries. Extensive surface-irrigated small grain, sugar beet, potato, and alfalfa farming occurs. Frost-free season is shorter and crop variety is less than downstream in Ecoregions 12a and 12i. Ecoregion 12e is lower and less rugged than Ecoregions 12d and 80b. Aquatic resources have been degraded by irrigation diversions, channelization, dams, sewage treatment, nonpoint pollution, food processing, and phosphate processing.

— EPA

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