More than 1.6 million American shad have been counted at Bonneville Dam this year as of June 17 and a few of the non-native fish have even been counted as high in the river basin as Lower Granite Dam, the uppermost of the four lower Snake River dams, and Priest Rapids Dam in the mid-Columbia. For more than a decade they have outnumbered all other anadromous fish entering the river combined.
