as a north wing of the dam from the original Right powerhouse. This addition expanded power generation by 300%. Lake Roosevelt Grand Coulee Pumping-Generating Plant (1953) consist of 12 pump-turbine units and two reversible pump-turbine units.) The reversible pump-turbines are used to move water from Lake Roosevelt into Banks Lake, from which it can be either sent south into the Columbia Basin Irrigation system or returned to Lake Roosevelt by the generating pumps to create additional electricity for the grid. Feeder Canal, North and Dry Falls Dams, Banks Lake Banks Lake (1951) is an artificial impoundment in the Upper Grand Coulee. It is long and wide. The coulee has nearly vertical rock walls up to high. North Dam, near the town of Grand Coulee, has a maximum height of and a crest length of . Dry Falls, or South Dam, near Coulee City, has a maximum height of and a crest length of . The crest elevation of both dams is . Project water enters Banks Lake through the Feeder Canal from the Pump-generating plant. The outlet for Banks Lake is the Main Canal near Coulee City. It is near the east abutment of Dry Falls Dam. Banks Lake serves as an equalizing reservoir for storage of water for irrigation and can be used to for power generation. Feeder Canal (1951) links North Dam at northern end of Banks Lake with the siphon outlets for the Grand Coulee Pumping—Generating plants discharge lines. It is long running in an open concrete-lined canal, and a twin-barrel concrete cut—and-cover conduit. Main Canal (1951) is , including of lake sections. Bacon Tunnel and Siphon (1950) is a long sealed Siphon under the eastern extension of the Dry Falls draw. Billy Clapp Lake (Pinto Dam – zoned earth & rockfill) (1951) aka (Long Lake Dam) is at the south end of Long Lake Coulee. The reservoir is long and wide. Potholes Reservoir Irrigation of the Columbia Basin When it was built, Grand Coulee Dam was the largest dam in the world, but it was only part of the irrigation project. Additional dams were built at the north and south ends of Grand Coulee, the dry canyon south of Grand Coulee Dam, allowing the coulee to be filled with water pumped up from the Columbia River. The resulting reservoir, called Banks Lake, is about long. Banks Lake serves as the CBP's initial storage reservoir. Additional canals,