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![BROOD YEAR 2018 JUVENILE SALMONID PRODUCTION AND PASSAGE INDICES AT RED BLUFF DIVERSION DAM](/sites/default/files/styles/max_325x325/public/documents/by2018_rbdd_rst_final_annual_report_080420.pdf-p1.jpeg?itok=IJRltCZ9)
Brood year 2018 (BY2018) juvenile winter Chinook salmon estimated passage at Red Bluff Diversion Dam (RBDD) was 1,168,263 for fry and pre-smolt/smolts combined. The fry-equivalent rotary trap juvenile production index (JPI) was the highest value reported in the last five years; estimated at 1,477,529 with the lower and upper 90% confidence intervals (CI) extending from 824,706 to 2,130,352 juveniles, respectively. The estimated egg-to-fry (ETF) survival rate, based on the BY2018 winter Chinook fry-equivalent JPI was 26.6%, slightly above the 21-year average ETF survival rate of 25.0%. The range of ETF survival rates based on the 90% CI were 14.9% to 38.4%.
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