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arch arch dams Arrowrock Arrowrock Dam back fill Boise project borrow pits built Bureau of Reclamation buttresses cableway canyon cement cent channel cobbles cofferdams completed conduit construction contracting officer contraction joints contractor core wall cost Creek crest crete cubic yards cut-off trench depth directed discharge downstream face drainage drains drawings drilled earth electrical elevation embankment emergency gate engineer excavation fault zone foot foundation furnished Government grout holes hauling hoist Illus included installed irrigation located material maximum ment metal miles needle valves North Platte project operation outlet Owyhee Dam paint paragraph Pathfinder Dam penstock pipe pits placed plant portion pressure grouting railroad reinforcing steel reservoir riprap river roller sand schedule second-feet shaft shown side slope sluice sluiceway solid rock specifications spillway storage stream bed structure suitable surface thickness timbering tion tracting officer trash-rack unit prices bid upstream face vertical