Technically I think the weir is still there, it has just been made less dangerous by making the drop less severe.
Quote:
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By constructing rock structures below the weir, the water level will be backed up to eliminate the deadly recirculation. The backed-up water will drop over a series of short swifts followed by calm pools.
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http://www.harviepassage.ca/about.html
Just to clarify, it is not the cost of the dredging/diversion that scares me, but the ecological consequences. Any anglers or people with more ecological knowledge want to weigh in?