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2005
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2004
Ledgerwood, R. D., B. Ryan, E. M. Dawley, E. P. Nunnallee, J. W. Ferguson. 2004. A surface trawl to detect migrating juvenile Salmonids tagged with passive integrated transponder tags. North American Journal of Fisheries Management, 24:440-451.
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2003
Ledgerwood, R. D., B. Ryan, C. Z. Banks, E. P. Nunallee, B. P. Sandford, S. G. Smith, J. W. Ferguson. 2003. Detection of PIT-tagged juvenile salmonids in the Columbia River estuary using a surface-trawl detection system, 1999. Report of Research, Fish Ecology Division, Northwest Fisheries Science Center, v, 66 p.
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2002
Ryan, B., C. Z. Banks, E. P. Nunnallee, R. D. Ledgerwood, J. W. Ferguson. 2002. Detection of passive integrated transponder (PIT) tags on piscivorous bird colonies in the Columbia River Basin, 1998 and 1999. Report to the U.S. Army Corps of Engineers, Walla Walla District, Contract W68SBV806ZZ741, iii, 15 p.
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Ryan, B., J. H. Glabek, J. W. Ferguson, E. P. Nunnallee, R. D. Ledgerwood. 2002. Detection of passive integrated transponder tags on piscivorous birds colonies in the Columbia River Basin, 2000. Report by National Marine Fisheries Service to the U.S. Army Corps of Engineers, Walla Walla, Washington.
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2001
Collis, K., D. Roby, B. Ryan, R. D. Ledgerwood. 2001. Colonial Waterbird Predation on Juvenile Salmonids Tagged with Passive Integrated Transponders in the Columbia River Estuary: Vulnerability of Different Salmonid Species, Stocks, and Rearing Types. Transactions of the American Fisheries Society, 130:385-396.
Ledgerwood, R. D., B. Ryan, R. N. Iwamoto. 2001. Estuarine and nearshore-ocean acoustic tracking of juvenile spring chinook salmon from the Columbia River. Pages 245-255 in Moore, A., I. Russell. (Eds.) Advances in fish telemetry: proceedings of the 3rd conference on fish telemetry in Europe, June 20-25, 1999, Norwich, UK. Centre for Environment, Fisheries, and Aquaculture Science, Lowestoft, UK.
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2000
Gilbreath, L. G., D. Smith, R. D. Ledgerwood, S. S. Pool, S. J. Grabowski. 2000. Limnological investigations in John Day reservoir including selected upper reservoir habitats, April 1994 to September 1995. Report to the U.S. Army Corps of Engineers, Contract W66QKZ833356795, 152 p.
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Ledgerwood, R. D., B. Ryan, E. P. Nunnallee, J. W. Ferguson. 2000. Estuarine recovery of PIT-tagged salmonids from the Lower Granite Dam transportation study, 1998. Report to the U.S. Army Corps of Engineers, Walla Walla District, Contract E8960100, 50 p. plus appendices.
Ledgerwood, R. D., S. S. Pool, L. G. Gilbreath, S. J. Grabowski, D. Smith. 2000. Limnology of selected shallow-water habitats in Lower Granite reservoir, 1994-95. Report to the U.S. Army Corps of Engineers, Contract E86940115, 46 p. plus appendices.
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1998
Dawley, E. M., L. G. Gilbreath, R. D. Ledgerwood, P. J. Bentley, B. P. Sandford. 1998. Effects of bypass systems at Bonneville Dam Second Powerhouse on downstream migrant salmon and steelhead; direct capture assessment, 1990-1992. Final report of research by Fish Ecology Division, Northwest Fisheries Science Center to the U.S. Army Corps of Engineers, Contract DACW57-85-H-0001, 53 p. plus appendices.
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1997
Ledgerwood, R. D., E. M. Dawley, B. W. Peterson, R. N. Iwamoto. 1997. Estuarine recovery of PIT-tagged juvenile salmonids from the Lower Granite Dam transportation study, 1996. Report to the U.S. Army Corps of Engineers, Contract E8960100, 54 pgs. plus appendice p.
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1994
Ledgerwood, R. D., E. M. Dawley, L. G. Gilbreath, L. T. Parker, B. P. Sandford, S. J. Grabowski. 1994. Relative survival of subyearling chinook salmon after passage through the bypass system at the first powerhouse or a turbine at the first or second powerhouse and through the tailrace basins at Bonneville Dam, 1992. Coastal Zone and Estuarine Studies Division, Northwest Fisheries Science Center, Seattle, WA, ii, 83 p.
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1993
Gilbreath, L. G., E. M. Dawley, R. D. Ledgerwood, P. J. Bentley, S. J. Grabowski. 1993. Relative survival of subyearling chinook salmon that have passed Bonneville Dam via the spillway or second powerhouse turbines or bypass system: adult recoveries through 1991. Report to the U.S. Army Corps of Engineers, Contract E96910013, 26 p.
Ledgerwood, R. D., E. M. Dawley, P. J. Bentley, L. G. Gilbreath, T. P. Poe, H. L. HANSEN. 1993. Effectiveness of predator removal for protecting juvenile fall chinook salmon released from Bonneville Hatchery, 1991. U.S. Dept. of Commerce, NOAA Tech. Memo., NMFS-NWFSC-9, 63 p.
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