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FOREWORD Moapa Valley Subevaluation Unit, a portion of .Virgin River Unit, is a drainage to Colorado River. See the inside of the report cover. Moapa Valley Subevaluation Unit was identified as a problem area where irrigation and erosion are diffuse sources of salinity. During the study, alternative solutions were identified and estimates were made of effects of the plans to reduce salt loading to Colorado River. An interdisciplinary team prepared the report. The "USDA Study Plan for the Virgin River Unit", revised August 1978, and the Soil Conservation Service (SCS) publication "Guide for Environmental Assessment", March 1977 along with SCS environmental policy and 7 CFR-650 were references. Information pertaining to assessments for compliance with the National Environmental Policy Act of 1969 is in the appendices. Assistance from other Federal and State of Nevada agencies is acknow- ledged. Nevada Department of Wildlife information was used for biological assessment; the United States Department of Interior (USDI), Bureau of Land Management (BLM) color aerial photography facilitated identification of wet- 1 and areas; pub 1 i shed reports, stream gag e data and other i nformati on of the United States Department of Interior, Water and Power Resources Service (WPRS) and the USDI Geological Survey were used. Other input included Clark County Conservation District onfarm irrigation inventories; and reports pre- pared for Clark County, Nevada, for areawide water management planning which were used extensively. The USD~Science and Education Administration-Agricultural Research (SEA-AR) Salinity Laboratory, Riverside, California outlined study needs, provided consultative assistance and analyzed water quality samples. Their assistance in interpreting laboratory test results and reviewing results of the study was very helpful. 0026711 i