US Bureau of Reclamation, Bismark, North Dakota No description specified. 1-3 (3 Records) Documents Keyhole Reservoir 1997 Evaluative Test Excavations at Site 48CK1309 (1999) Keyhole Reservoir 1997 Evaluative Test Excavations at Site 48CK1309 (1999) Keyhole Reservoir 1997 Evaluative Test Excavations at Site 48CK1309 (1999)