On May 4, 2004, the SAPPI corporation performed repairs at the Cumberland Mills dam at Ammoncongin Falls in Westbrook. In doing so, the Presumpscot River in downtown Westbrook was lowered to its natural elevation and channel.
This repair operation allowed Friends of Sebago Lake to document the natural character of the one mile reach of the Presumpscot River from Ammoncongin Falls in Westbrook to Saccarappa Falls in the absence of ponding created by the Cumberland Mills dam.

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