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COLORADO RIVER STORAGE PROJECT AND PARTICIPATING PROJECTS A. AUTHORIZED STORAGE UNITS (Information relative to Storage Units and participating projects has been obtained from reports on investigations and activities of the United States Department of the Interior, Bureau of Reclamation.; The Colorado River Storage Project (CRSP) was authorized for construc- tion by the United States Congress in the Act of April 11, 1956, (70 Stat. 105). Four storage units were authorized by this Act: Glen Canyon Dam and Reservoir (Lake Powell) on the Colorado River in Arizona and Utah; Navajo Dam and Reservoir on the San Juan River in New Mexico and Colorado; Flaming Gorge Dam and Reservoir on the Green River in Utah and Wyoming; and the Wayne N. Aspinall Storage Unit (Aspinall Unit), formerly named the Curecanti Storage Unit and rededicated in July 1981, on the Gunnison River in Colorado. The Aspinall Unit consists of three dams and reservoirs: Blue Mesa, Morrow Point, and Crystal. Combined, the four storage units provide about 33,583,000acre-feet of water storage capacity. The Act authorized the construction of eleven participating projects. Ten additional participating projects have been authorized by subsequent congressional legislation. The storage units and participating projects are described in the 45th and earlier annual reports of the Upper Colorado River Commission. Progress in construction, planning, operation and investigation of the storage units and participating projects accomplished during the past water year is briefly outlined as follows: 1. Glen Canyon Storage Unit Glen Canyon Dam and Reservoir (Lake Powell) comprises the key Storage Unit of the CRSP and is the largest of the initial four, providing about 80 percent of the storage and generating capacity. Glen Canyon Dam was completed in 1964. a. Glen Canyon Dam Environmental Impact Statement (EIS) and Glen Canyon Environmental Studies (GCES) In 1982, the Department of the Interior initiated the GCES to quantify and qualify the environmental and recreational impacts of the operations of Glen Canyon Dam. Phase I of these studies was completed in 1988. Upon review by Interior, it was determined that additional data were required on the impacts of low and fluctuating flows before any conclusions could be made. Phase" of the GCES began in November of 1988 and included 34 1