On 4 June 1814, the diversion became enlarged by erosion as the lake level dropped  within a few hours, draining great quantities of water into the Pleasant River. The resulting flood swept away two mills and six bridges along the Pleasant and Presumpscot rivers as far downstream as South Windham.
On June 4, 1814, due to erosion of the diversion, the lake level dropped quickly within a few hours, causing water to flow into the Pleasant River. This flood destroyed two mills and six bridges along the Pleasant and Presumpscot rivers up to South Windham.