Spill regimes and dam passage technology appear to be achieving the
goal of minimizing direct mortality for juvenile salmon migrating down
through the Snake-Columbia river hydropower system, according to an ongoing
study.
The average reach or per dam survival in 1999 for both yearling chinook
salmon and steelhead stayed in an elevated range first reached in 1995,
according to Bill Muir, principal researcher for the National Marine Fisheries
Service’s survival study. That range is from …
