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The benefits of slack water reservoirs and electric power altered those currents.

The juveniles had trouble reaching the net, getting lost in the reservoir’s slack waters without a strong current to pull them.

Prospectors’ eyes are trained to look for opportunity: Eddies, abrupt shifts in direction caused by downed trees, and slack water “drop-out zones,” where gold, 19 times heavier than water, will fall as flow slows.

Olys are picky about where they live, preferring slack water and areas fed by creeks and streams.

The eight large dams along the Snake and Columbia rivers created 325 miles of slack water in reservoirs.