March 29, 2007
A report from the US Army Corps of Engineers looks at the impacts bridge mitigation along the Blackfoot River will have on bull trout runs. The report (PDF, 3.7 Mb) finds that while dam removal will prove a great benefit to bull trout, the fish could encounter difficult passage near the I-90 piers. But the report also states that “fortunately, the current modeling results indicate areas of lower velocity near the shoreline of both banks, particularly the left bank. If the modeling results are reasonably accurate, these low velocity areas should represent challenging but sufficient conditions for upstream passage.”
The five Blackfoot River bridges were built to stand in still water and thus need to be upgraded or replaced before the dam can be removed in 2008.