Alaska officials and authorities in British Columbia announced they have completed and will not continue data collection on three transboundary watersheds, including the Stikine River, despite concerns from fishing and tribal interests that the effort does not go far enough.

The work stemmed from concerns about possible damage that mining activity in Canada could inflict on waters that cross into Alaska. A 22-page final report released Feb. 25 culminated two years of data collected from water, sediment and fish tissue from the three waterways: The Stikine, the Taku River just south of Junea...