BROOD YEAR 2017 JUVENILE SALMONID PRODUCTION AND PASSAGE INDICES AT RED BLUFF DIVERSION DAM

Brood year 2017 (BY2017) juvenile winter Chinook salmon estimated passage at Red Bluff Diversion Dam (RBDD) was 601,677 for fry and pre-smolt/smolts combined. The fry-equivalent rotary trap juvenile production index (JPI) was estimated at 734,432 with the lower and upper 90% confidence intervals (CI) extending from 471,292 to 997,572 juveniles, respectively. The estimated egg-to-fry (ETF) survival rate, based on the BY2017 winter Chinook fry-equivalent JPI was 48.7%, the highest value detected since monitoring began. The range of ETF survival rates based on the 90% CI were 31.3% to 66.2%.