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..v COLORADO RIVER INDIAN RESERVATION ~ ARIZONA I"~ ""Q i-'- ~ Data available indicates this unit is not a significant contributor to the salt problem in the Colorado River. Therefore, the USDA study underway is being performed with irrigation water management as the primary objective rather than salinity control. It is a USDA Cooperative River Basin Study carried out under Sec. 6 of Public Law 83-566, at the request of the Tribal Council and the Parker Valley Natural Resource Conservation District. SCS's basic data collection is progressing on schedule. The soil survey is about 15% complete. Onfarm water measuring weirs to determine irrigation effiencies have been installed. Weirs to measure project spills have been installed at 30 sites. LITTLE COLORADO RIVER BASIN - ARIZONA AND NEW MEXICO This study is also being performed as a USDA Cooperative River Basin Study under Sec. 6 of Public Law 83-566, in response to requests from the Arizona Water Commission, the New Mexico State Engineer's Office, and the involved Natural Resource Conservation Districts in the Basin. If the study shows significant potential for salinity control, then a separate salinity control report will be issued by USDA, To date the study shows that salt loading from range and irrigated land in the Basin is quite small. The study report is scheduled to be completed in March 1981. PALO VERDE - CALIFORNIA No change in status, WPRS has not yet reached a decision on whether to proceed with a study on the Palo Verde Unit, pending the completion of an EPA-funded 208 water quality study. SCS's agreement with WPRS is to proceed with a study when they initiate theirs. DIRTY DEVIL RIVER - UTAH No work has been done on this unit and preparation of a plan of study has been indefinitely delayed. LYMAN - WYOMING Salinity prOblems and potential solutions were reviewed onsite. Preliminary evaluation of the prOblems and the poor potential to arrive at a viable solution have placed this proposed study in a "schedule delayed" category. Final decisions as to what can be done in Big Sandy need to be reached before proceeding with this study. No activity is anticipated during the next 6 months. HENRY'S FORK - MANILA - WYOMING . This study remains in the "not scheduled" category pending decisions on the Big Sandy and the Lyman Units. ROARING FORK - COLORADO , This study remains in the "not scheduled" category. _"i"~- I 11 ',',,,,.' .t&. i:"-,i,~i~:ii ,"~,' ;'~k~-j