All the Fish Passage Center does is monitor and report the passage of fish (mostly anadromous), streamflows, and spills through hydro-electric dams up and down the Columbia and Snake Rivers and their tributaries. Sometimes its scientists will suggest that increased spill through certain dams will aid in smolt survival, or that barging of fish around the snake river hydro dams does not improve survival, but their conclusions are based on the data in such cases.
Their web site demonstrates all of this:
http://www.fpc.orgIdaho Senator Larry Craig is clearly in the pocket of business interests (utilities, irrigators, etc.) who don't care about the survival of anadromous fish, and would rather the fish ladders in the dams be sealed off, and that spill for compliance with federal environmental and endangered species regulations become a thing of the past.