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Montezuma County, Colorado |
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The Mancos Valley unit was not identified by name in Title II of the Colorado River Basin Salinity Control Act, but was identified by USDA as an area which should be studied for possible salinity control. At the request of the Mancos Conservation District, an investigation was undertaken by the USDA Natural Resources Conservation Service in 2001 with assistance from Reclamation’s UC Region, the Colorado River basin states, and the U.S. Geological Survey to determine the feasibility of implementing salinity control measures on irrigated agricultural lands in the Mancos Valley. The Mancos River contributes an average of 42,300 to 43,000 tons of salt annually to the Colorado River. Approximately 26,000 tons comes from irrigation practices. The proposed project will reduce seepage from 60 percent of the 26 ditches and increase irrigation efficiency to reduce deep percolation on 5,400 acres of agricultural land. The project plans to convert 228,940 linear feet of earthen irrigation ditches to underground pipelines. Another 71,558 feet of irrigation ditch will be treated with polyacrylamide to reduce seepage. Sprinkler irrigation systems will be installed on 4,070 acres; improved surface irrigation systems will be installed on 1,330 acres. The planned total annual salt load reduction is approximately 12,000 tons. The total federal cost of project implementation is calculated as $8,753,357. Implementation should begin following the 2004 irrigation season. See other Basinwide Salinity Control Projects. |
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