Woodsville, located in Haverhill, New Hampshire, is home to a significant hydroelectric dam on the Ammonoosuc River. Built in 1827, this concrete gravity dam stands at 23 feet tall and stretches 300 feet in length, providing a storage capacity of 124 acre-feet and serving purposes of hydroelectric power generation and water supply. Managed by the Federal Energy Regulatory Commission, the dam is regulated by the New Hampshire Department of Environmental Services Dam Bureau, ensuring state inspection, enforcement, and permitting standards are met.

With a spillway width of 300 feet and a maximum discharge capacity of 18,500 cubic feet per second, the Woodsville dam poses a significant hazard potential but is currently assessed as having a moderate risk level. Emergency action plans and risk management measures are in place, with inspections occurring at regular intervals to ensure the dam's structural integrity. The dam plays a crucial role in water resource management in the region, supporting both energy production and water supply needs while navigating the complexities of climate change and changing water patterns in the area.