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![Three-mile fish ladder at Cazadero Dam fish7957.jpg Three-mile fish ladder at Cazadero Dam](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_fish7957.jpg?itok=Wgy17OtC)
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Three-mile fish ladder at Cazadero Dam. Power dams have changed theenvironment drastically. Ladders - some remarkably successful - are one meansof maintaining runs of salmon against effects of huge enginnering projects. Butnot all problems have been solved. (Image credit: NOAA Central Library Historical Fisheries Collection; P. 492 of Our Changing Fisheries 1970 Centenary NMFS centenary volume)