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Bonneville/Lower Granite Dam Steelhead Count History

Saturday, August 1, 2015 


Bonneville Dam
Last Ten Years
Year Total
2014  309,883
2013  226,643
2012  221,442
2011  357,280
2010 383,298
2009 590,199
2008 340,969
2007 310,276
2006 325,999
2005 302,437


Lower Granite Dam
Last Ten Years
Year Fall Spring Total
2014-2015 154,965 8,988 163,953
2013-2014 100,345 7,791 108,136
2012-2013 101,640 7,546 109,186
2011-2012 171,285 9,035
180,320
2010-2011 195,947 12,018 207,965
2009-2010 312,430 10,952 323,382
2008-2009 167,603 11,267 178,870
2007-2008 146,230 7,878 154,108
2006-2007 138,313 10,853 149,166
2005-2006 147,506 7,678 155,184

  • Bonneville Dam run counted from July 1 to December 31.
  • Lower Granite Dam run counted from July 1 to December 31 (Fall) and March 1 to June 30 (Spring).
  • Most of the steelhead that are bound for Idaho pass Bonneville Dam between July 1 and October 31. Most of these fish pass Lower Granite Dam in the fall, however, some over-winter downstream of Lower Granite Dam and continue their migration to Idaho in the spring.
Last Updated: July 14, 2015 
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