Prepared in cooperation with U.S. Army Corps of Engineers Synthesis of Downstream Fish Passage Information at Projects Owned by the U.S. Army Corps of Engineers in the Willamette River Basin, Oregon Open-File Report 2017–1101 U.S. Department of the Interior U.S. Geological Survey Cover: Photographs showing fish passage and Willamette River Basin projects in Oregon. Top left: Lookout Point Dam tailrace looking upstream and rotary screw trap, June 1, 2017. Top right: Juvenile Chinook salmon, June 26, 2017. Bottom left: Research boat at Cougar Reservoir, March 3, 2011. Photograph by John Beeman, U.S. Geological Survey. Bottom right: Portable floating fish collector in Cougar Reservoir, July 28, 2015. All photographs by Amy Hansen, U.S. Geological Survey, unless otherwise noted. Synthesis of Downstream Fish Passage Information at Projects Owned by the U.S. Army Corps of Engineers in the Willamette River Basin, Oregon By Amy C. Hansen, Tobias J. Kock, and Gabriel S. Hansen Prepared in cooperation with the U.S. Army Corps of Engineers Open-File Report 2017–1101 U.S. Department of the Interior U.S. Geological Survey U.S. Department of the Interior RYAN K. ZINKE, Secretary U.S. Geological Survey William H. Werkheiser, Acting Director U.S. Geological Survey, Reston, Virginia: 2017 For more information on the USGS—the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment—visit https://www.usgs.gov/ or call 1–888–ASK–USGS (1–888–275–8747). For an overview of USGS information products, including maps, imagery, and publications, visit https:/store.usgs.gov. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this information product, for the most part, is in the public domain, it also may contain copyrighted materials as noted in the text. Permission to reproduce copyrighted items must be secured from the copyright owner. Suggested citation: Hansen, A.C., Kock, T.J., and Hansen, G.S., 2017, Synthesis of downstream fish passage information at projects owned by the U.S. Army Corps of Engineers in the Willamette River Basin, Oregon: U.S. Geological Survey Open File Report 2017-1101, 118 p., https://doi.org/10.3133/ofr20171101. ISSN 2331-1258 (online) Contents Abstract ...................................................................................................................................................................... 1 Introduction ................................................................................................................................................................. 1 North Santiam River Subbasin .................................................................................................................................... 4 Subbasin Description .............................................................................................................................................. 4 Detroit Dam ......................................................................................................................................................... 7 Big Cliff Dam ....................................................................................................................................................... 8 Reservoir Entry ....................................................................................................................................................... 9 Reservoir Residence and Behavior ....................................................................................................................... 13 Dam Passage ....................................................................................................................................................... 20 Passage Routes and Effects of Operations ....................................................................................................... 20 Seasonal and Diel Patterns ............................................................................................................................... 23 Survival.............................................................................................................................................................. 24 Summary ............................................................................................................................................................... 27 South Santiam River Subbasin ................................................................................................................................. 28 Subbasin Description ............................................................................................................................................ 28 Green Peter Dam .............................................................................................................................................. 30 Foster Dam ........................................................................................................................................................ 31 Reservoir Entry ..................................................................................................................................................... 33 Reservoir Residence and Behavior ....................................................................................................................... 36 Dam Passage ....................................................................................................................................................... 38 Passage Routes and Effects of Operations ....................................................................................................... 38 Seasonal and Diel Patterns ............................................................................................................................... 40 Survival.............................................................................................................................................................. 40 Summary ............................................................................................................................................................... 44 McKenzie River Subbasin ......................................................................................................................................... 44 Subbasin Description ............................................................................................................................................ 44 Cougar Dam ...................................................................................................................................................... 47 Reservoir Entry ..................................................................................................................................................... 52 Reservoir Residence and Behavior ....................................................................................................................... 55 Dam Passage ....................................................................................................................................................... 61 Passage Routes and Effects of Operations ....................................................................................................... 61 Seasonal and Diel Patterns ............................................................................................................................... 63 Summary ............................................................................................................................................................... 66 Middle Fork Willamette River Subbasin .................................................................................................................... 67 Hills Creek Dam ................................................................................................................................................ 70 Lookout Point Dam ............................................................................................................................................ 71 Dexter Dam ....................................................................................................................................................... 73 Fall Creek Dam ................................................................................................................................................. 74 Reservoir Entry ..................................................................................................................................................... 75 Reservoir Residence and Behavior ....................................................................................................................... 77 Dam Passage ....................................................................................................................................................... 79 Passage Routes and Effects of Operations ....................................................................................................... 79 Seasonal and Diel Patterns ............................................................................................................................... 80 Survival.............................................................................................................................................................. 81 Summary ..............................................................................................................................................................