Questions & Answers: Lower Granite Dam
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Some answers change over time; please take note of the "answered-on" date.Displaying 1 - 2 of 2 questions
Q: So out of the 80,000 approximate chinook crossing Lower Granite this spring/summer how many of those are headed to Idaho fisheries? How many of them return to the Snake (Hells Canyon), Clearwater,Salmon rivers.
A: Final accounting of returns will not be completed until late August but preliminary estimates of the split of adult returns over Lower Granite suggest that the contribtions to an adult passasge of 80,000 fish might be distributed approximately as follows: Total Passage 80,000 Wild Natural ...
Q: What percentage of salmon that cross Lower granite survive to Idaho hatcheries? Not counting harvested fish. Just a % number that will survive the journey
A: Natural mortality (excluding harvest) for salmon between Lower Granite Dam and hatchery facilites varies by facility and year but typically is not more than 5%. So if there were no harvest in Idaho and 10,000 hatchery fish crossed Lower Granite Dam 9,500 or more would make it back to hatcheries. ...