Construction of dams for hydroelectric power production affects seasonal movement of white sturgeon in many river systems, with the Columbia River Basin being a large contributor to shifts in the distribution and movement. The dams present in the basin have largely blocked the upstream movement of sturgeon, due to designs of fish ladders being more specified for salmon and steelhead. While downstream passage of sturgeon through the dams has been reported, the route of passage was never identified. Downstream movement through the dams are only possible through operating turbines, open spill gates and the ice and trash sluiceway.