The Northwest Power and Conservation Council requested that the 11-member Independent Scientific Advisory Board review a proposal to increase spill over dams on the Snake and Columbia rivers during the spring for 10 years. NWPCC received the proposal for this spill experiment from fish and wildlife agencies, Indian tribes and the state of Oregon as a proposed amendment to its Columbia River Basin Fish and Wildlife Program. The increased spill would be conducted to determine whether it affects survival of juvenile salmon and steelhead migrating to the ocean. The proposal recommends increasing spill to 125% of the total dissolved gas level in the river below dam spillways for 10 years, with a comprehensive assessment of smolt-to-adult survival after five years.
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