The sh ladder has been modi ed to increase salmon and steelhead passage, and a deeper channel created to direct sh to the ladder. New sh screens and ladders have been constructed at numerous irrigation diversion sites throughout the Umatilla Basin. Of particular importance are nonpoint sources, water temperature, nutrient levels and sedimentation, all factors affecting salmon survival. The procedure is one by which juvenile salmon raised in hatcheries are acclimated to a particular stretch of stream or river before release. They imprint on the area, and return to spawn naturally.
Hatcheries are therefore temporary facilities with a speci c purpose and life span.
They are to be replaced by healthy, naturally spawning runs of salmon.