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000 second-feet acre-feet anchor anchor bars backfill Bighorn River Boysen Dam Boysen Reservoir bridge bulkhead gate cable circuit breakers cofferdam compressor construction contract contractor crest cubic foot cutoff deck designed diorite discharge diversion tunnel downstream draft tube electrical elevation embankment embedded equipment excavation feet flood foot foundation Furnishing and installing gate structure girders Government camp gravel Gros Ventre grout header hoist holes were drilled hydraulic inlet insulated joints leaf left abutment load located material maximum metal operating Order for changes outlet pipe penstock percent pier piezometer placed plug pounds per square powerhouse powerplant pressure pump radial gates railroad tunnel reinforced relocation reservoir water reservoir water surface right abutment riprap river rock sandstone seal side slope spillway square inch stilling basin storage stresses structural steel switchyard tailwater tank Thermopolis transformer trashrack structure turbine unit upstream vertical wall