This is one of those tidal streams.
according to the AMC Maine river guide, 2nd edition, Denneys bay has a tide current of 3 to 5 knots - I am unsure of the tidal speed in the actual rapids. Supposedly there is a large eddy with a large train of three foot waves on its line. The other part of the rapid (a second channel) has large waves and boils. It is published in the guide as class III in nature. It is important to note that because of the tidal influence of the near by Bay of Funde, the tides run over twice the range of the rest of Maine (averaging about 20 feet), and therefore create much more speed and energy per cycle.
The falls are very dangerous, the current I have heard, but cannot verify, has reached 10 knots in the area.
One place to get tidal data is this link. But there are plenty others.
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A hardy group of northeast boaters climbed into the natural river channel below a hydropower dam to participate in a flow study designed to assess whether whitewater flows should be restored to this dewatered river reach on the Connecticut River. While significant obstacles remain, this site has the potential for providing instruction, playboating, and a big water feature that that could be run throughout much of the year and provide a much needed boost to the local economy.
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