Eel Weir, located in South Windham, Maine, is a captivating masonry dam completed in 1879 for hydroelectric purposes along the beautiful Presumpscot River. With a height of 22 feet and a storage capacity of 330,000 acre-feet, this dam plays a crucial role in flood risk reduction, water supply, recreation, and supporting fish and wildlife habitats in the area. Its uncontrolled spillway, 115 feet wide, ensures safe water discharge during high flow events.

Managed by a private owner and regulated by the Federal Energy Regulatory Commission, Eel Weir poses a high hazard potential due to its age and condition assessment being not available. Despite this, the dam has a moderate risk assessment rating of 3, indicating the need for ongoing monitoring and potential risk management measures. The dam features five slide gates for water control and is inspected annually to ensure its safety and functionality, with the last inspection conducted in September 2020.

For water resource and climate enthusiasts, Eel Weir stands as a historic and vital structure in Maine's water infrastructure, blending both functionality and environmental stewardship. Its presence not only supports clean energy generation through hydroelectric power but also contributes to the preservation of the surrounding ecosystem and recreational opportunities for the community. As concerns about climate change and water resource management continue to grow, Eel Weir serves as a reminder of the balance between harnessing water resources for human needs and protecting the natural world for future generations.