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of a 69,000-volt, gas-insulated, submarine cable' enclosed in a 5-inch diameter steel pipe that extends from portal to portal. Automatic pressure-control equipment, installed at each portal, regulates the dry nitrogen. gas to operate at an average pressure of 200 pounds per souare inch. " The pipe line paralleling the highway to the east portal is for temporary use of Eastern Slope water users until permanent facilities of the Estes Park Aqueduct and Power System. are completed. Construction of this conduit by the Big Thompson Mutual Pipe Line and Irrigation Company for the Northern Colorado Water Conservancy District nermits the diversion of as much as 50,000 acre-feet annually to canals along the Big Thompson River. :, Trail Ridge Road This famous road through the Rocky Mountain National Park is the highest continuous highway in America. For fifteen miles this highway ~~nds across the crest of the Continental Divide above timberline at elevations ranging from 11,000 to 12,18] feet above sea level. Indians used a nearly parallel route for their annual trips from Estes Park where they wintered to North and South Parks where they hunted in summer. Rocky Mountain National Park comprises an area of 405 square miles of the most spectacular sections of. the rugged Rockies. It has within its boundaries 42 mountains which; rise to elevations of more. than 12~OOO feet--the. higteat heing Longs.Peak ~~tb ~ elevation .of:14,25S'feet above sea level. , . ~., ", ~ .Estes Park Aqueduct and Power System .... Thi's ..system receives, the flow from the' Al va B. Adams Tunnel-- transports the imported water east ahout 5.5 miles-~and utilizes 744 feet. of fall between the .East ~ortal Reservoir and.the-Big Thompson River near Estes Park. Between the Adams Tunnel and Marys Lake Reservoir, the water passes through the l.]-mile Aspen Creek Siphon, the l.]-mile Rams Horn Tunnel, and the Marys Lake Power Plant. Between Marys Lake Reservoir and Lake Estes on the Big Thompson River, the water passes through the 1.7-mile long Prospect Mountain Conduit i'md Tunnel and the Este s Power Plant. Marys Lake Power Plant and lleservoir (1948-1950) .--The power plant, located on the western shore of Marys Lake Reservoir, is a single-unit plant with an installed capacity of 8,100 kilowatts and an avera!;e operating hefid of 212 feet and will have an average annual production of approximately 47 million kilowatt-hours. The reservoir occupies a natural basin, enlarged by the construction of two small earth and rockfi11 dikes, a~d provides 1,149 acre-feet of regulating capacity at elevfition 8045. These features, located 17