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<br />l!':) <br />CJ <br />~ <br />L"':: <br /> <br />c <br /> <br />care, operation, and maintenance. No change in water diversions are <br />made .by the Yuma County Water Users' Association from Siphon Drop <br />Powerplant, California Wasteway, or the Colorado River Siphon except <br />as requested or directed and at the time and in the amounts approved <br />by the River Operations Branch. The USGS is responsible for reporting <br />records of flow through Siphon Drop Powerplant, diversions from the <br />Yuma Main Canal to the Colorado River Siphon, and in the California <br />Wasteway to the river. <br /> <br />....... <br /> <br />High flows during 1980 deposited large amounts of sediment in the <br />Imperial Reservoir. The diversion pools above the headgates to the <br />two canals are scheduled to be dredged in 1982. <br /> <br />In compliance with Executive Order 11988, the flood plain area below <br />Imperial Dam was closed to camping late in the summer. It appears <br />that most of the campers went to areas north of the All-American Canal <br />and the Senator Wash area. <br /> <br />Bureau of Land Management I s plans to develop other campsites in the <br />Imperial Dam and Senator Wash area located on lands above the flood <br />plain were curtailed due to lack of funds. <br /> <br />Holiday weekends continue to attract large crowds of recreation <br />seekers, principally from the populated California coastal cities. <br />Law enforcement and vandalism problems were minor; the greatest <br />problems are the increased traffic on one-way bridges and the litter <br />left behind. <br /> <br />Water was diverted to Mittry Lake from the Gila Desilting Basin during <br />most of the year and amounted to 6,394 acre-feet. This water is <br />generally routed through Mittry Lake for improvement of water quality <br />and returned to the river system at Laguna Reservoir. Some water is <br />diverted from the Mittry Lake Canal to irrigate a waterfowl feeding <br />area adjacent to Mittry Lake. <br /> <br />3. California Sluiceway <br /> <br />About 2,000 cfs of the excess water arriving at Imperial Dam were <br />released through the California Sluiceway gates during much of <br />January. After January, normal sluicing operations of 7,500 to 8,000 <br />cfs flows for 15- to 20-minute periods were resumed. The channel is <br />in good condition with the water surface in the sluiceway below the <br />invert of the desUting basin sludge pipes. The sluicing program <br />continues to be an effective means of moving the sediment discharged <br />from the desilting basins downstream to the Laguna Desilting Basin. <br />The dredge was able to remove much of the sediment accumula tions <br />occurring in 1980 as the incoming sediment load in 1981 decreased <br />considerably. <br /> <br />11 <br />