Mainstem Klamath River Fall Chinook Salmon Redd Survey 2013

This report summarizes the 2013 fall Chinook salmon Oncorhynchus tshawytscha redd survey on the mainstem Klamath River and is the 21st such summary provided by the Arcata Fish and Wildlife Office. The survey was conducted over a 7-week period (October 22 to December 5, 2013), covering 114.7 river kilometers (rkm) between the Shasta River (rkm 288.5) and Indian Creek (rkm 173.8) confluences. We observed 2,611 fall Chinook salmon redds in 2013, which is the second highest count for this section of river since annual surveys began in 1993. Redd numbers over the previous 20-year history of this survey ranged from 243 (in 1993) to 3,390 (in 2012). The 2013 count is about 2.6 times larger than the prior 20-year mean (?? ? = 1,007). Redd densities within approximately 10-rkm sections were highest between China Creek (rkm 191.9) and Ottley Gulch (rkm 183.7; 60.4 redds/rkm) and lowest between Shasta River and Humbug Creek (rkm 279.7; 4.7 redds/rkm).