The North Dam, near the town of Grand Coulee, has a maximum height of 145 feet (44 m) and a crest length of 1,400 feet (430 m).[5] Crest elevation of both dams is 1,580 feet (480 m), and the maximum water level in Banks Lake is elevation 1,570 feet (480 m). Both North and Dry Falls dams have 10 feet (3.0 m) of freeboard for protection against wave action due to high winds.
^ Draft Environmental Statement, Columbia Basin Project, Washington; Columbia Basin Project, Ephrata, Washington; Department of the Interior, (INT DES-75-3), Bureau of Reclamation, Department of the Interior; Washington, D.C.; 1975