If I remember right, the ESA issue came up in the past. The state simply stated that if it was an issue, they would pull the fish ladder around the falls. This effectively stops all fish from going up, as historically it was very rare that any could make it up. I believe it was thought possible that some might be able to get around the falls during a high water event, but that is was unlikely and that it would not be consistent enough to produce any viable run. Historically I do not believe there were any anadromous fish present. Last I saw they still have a gill net fishery there, but it is likely that the fish are so dark by the time they start to cluster that the tribal netters focus on other areas for more valuable fish. By not netting as heavily in the immediate area, more might be able to get through.