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A survey of Bradley Lake and the Bradley River, including underwater contouring at the lake, was made in 1955 for use in studying possible plans of waterpower development. The survey was supplemented by surface geologic examinations. Illustrative plans of development in accord with the topography and geology are described in this report, and used with runoff records and estimates to compute the potential waterpower. Runoff records available in 1960 covered only two complete water years, October 1957 to September 1959. These were supplemented by estimates of monthly runoff from October 1949 to September 1957 based on a relationship with the runoff of the nearby Kasilof River and records for that stream. The runoff at the outlet of Bradley Lake was thus determined to have been about 334 cfs (cubic feet per second), or 84 inches per year on the drainage area of 54 square miles, from 1949 to 1959. Runoff from an additional area of 14 square miles could readily be diverted into the Bradley Lake basin to increase the water supply about 26 percent, and the waterpower estimates were made accordingly. It.was determined that a usable storage capacity of 300,000 acre-feet would have provided for substantially complete control in the 10-year period, 1949-59, with uniform release of 421 cfs. Development through a mean gross head of 1,131 feet to a powerhouse at tidewater some three and a half miles from the lake would provide for generation of 32,400 kw (kilowatts) continuously. The storage capacity could be obtained by a dam at the lake outlet to raise the surface 104 feet, or alternatively by a lower dam and a tunnel to tap the lake at depth. The runoff from 1949 to 1959 is estimated to have been about 90 percent of that during the 40-year period prior to 1960. A lesser degree of development corresponding to control and utilization of about 80 percent of the 40-year mean runoff also was considered. This would have required about 171,000 acre-feet of capacity for uniform release of 375 cfs. Development through a mean gross head of 1,110 feet would provide for generation of 28,300 kw continuously. The storage capacity could be obtained by a dam at the lake outlet to raise the surface 68 feet, or by a combination of damming and lake drawdown. Water could be conveyed from the lake to a powerhouse at tidewater by means of tunnels and pipelines along several alternative routes. It would be possible also to convey it along the Bradley River foF development in two nearly equal stages at powerhouses located on the river. A-l A-2 WATERPOWER RESOURCES OF THE UNITED STATES Geographic, climatic, and hydrologic features of the Keiiai Peninsula are discussed briefly. The runoff of the Bradley River is consistent with a mean annual precipitation of about 100 inches; whereas precipitation is less than 20 inches a short distance to the north in the rain shadow of the Kenai Mountains.

Waterpower resources of the Bradley River Basin, Kenai Peninsula, Alaska