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, the diversion expanded due to erosion as the lake level dropped rapidly in a few hours, causing significant water to flow into the Pleasant River. This flood demolished two mills and six bridges along the Pleasant and Presumpscot rivers up to South Windham.