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<br />In 2003, 16,843 razorback suckers (300 mm minimum size) were repatriated into Lake Mohave from <br />all sources. In 2004,25,418 wild larvae were captured from natural spawning congregations on Lake <br />Moh~rve and delivered to 'Willow Beach Hatchery. <br /> <br />Stmator '''ash and Laguna Reservoirs <br /> <br />Operations at Senator Wash Reservoir allow regulation of water deliveries to United States and <br />Mexican water users downstream of Imperial Dam. The reservoir is utilized as an off-stream storage <br />facility to meet downstream water demands and to conserve: water for future uses in the United States <br />and the scheduled uses of Mexico in accordance with Treaty obligations. Senator Wash Reservoir is <br />the only maj or storage facility below Parker Dam (approximately 142 river miles downstream) and <br />has storage capacity of13,836 acre-feet at full pool elevation of251 feet. Operational objectives are <br />to store excess flows from the river caused by water user cutbacks and side wash inflows due to rain. <br />Stored waters are utilized to meet the United States' and Mexico's demands. <br /> <br />Sinc~ 1992, elevation restrictions have been placed on Senator Wash due to potential piping and <br />liquefaction of foundation and embankment materials at Vl est Squaw Lake Dike and Senator Wash <br />Dam. Currently, Senator Wash is restricted to an elevation of240 feet (9,144 acre-feet of storage). <br />Excursions to 240 feet are allowed for no more than 10 consecutive days. The risk analysis update <br />report, "Report of Findings Senator Wash Dam," dated June 30,2003, from Reclamation's Technical <br />Service Center recommended that Senator Wash be restricted to elevation 235 feet (7,330 acre-feet <br />of storage) unless the pe:rmanent West Squaw Lake Dike filter blanket that was constructed in <br />calendar year 2002 is extended to the east. This filter blanket extension was completed in October <br />2004. <br /> <br />Laguna Reservoir is a regulating storage facility located approximately five river miles downstream <br />of I:lllperial Dam. Operational objectives are similar to those for Senator Wash Reservoir. The <br />storage capability of Laguna Reservoir has diminished from about 1,500 acre-feet to about 400 acre- <br />feet due to sediment accumulation and vegetation growth. Sediment accumulation in the reservoir <br />has occurred primarily due to floodteleases that occurred in 1983 and 1984, and flood control or <br />space building releases that occurred between 1985 and 1988 and from 1997 through 1999. <br />Dredging of the Laguna Reservoir to increase its storage capacity is currently being evaluated. <br />Maintenance dredging ofthe Laguna Desilting Basin, located above Laguna Dam, was started during <br />calendar year 2003 and was completed in calendar year 2004. The desilting basin at Laguna is <br />currently being extended by about 1,500 feet. This work should be completed by October 2004. <br /> <br />Imperial Dam <br /> <br />Imperial Dam isthe last diversion dam on the Colorado :River for United States water users. From <br />thehead works at Imperial Dam, the diversions of flows for the United States' and Mexico's water <br />users occur into the All American Canal on the California side, and into the Gila Gravity Main Canal <br />on the Arizona side ofthe dam. These diversions supply all the irrigation districts in the Yuma area, <br />:in Wellton-Mohawk, in the Imperial and Coachella Valleys, and through Siphon Drop and Pilot <br />Knobto the Northerly International Boundary (NJB) to the Mexicali Valley in Mexico. The <br /> <br />20 <br />