In contacting the Northwest Power Planning Council information office in 2021, this blog editor learned that the Washington State Department of Fish and Wildlife was given six months prior to the start of construction on the Grand Coulee Dam to devise a means of getting seasonal returning salmon upriver past the barrier of the new dam.  Apparently because of the proposed dam's height, migrating fish would have experienced and had to contend with nitrogen bends.  WSDFW was unable to resolve this issue in the design timeframe allowed to them.  Needless to say, the millennial indigenous native fishing on the upper Columbia River came to an abrupt end when the dam was finished.  The Consolidated Tribes of the Colville Reservation continue to hatch salmon and work on devising natural means of restoring nature's provision of salmon to the upper Columbia and to re-establish their millennial fishing culture.