10/23/2026
The Aquatic Resource Mitigation (ARM) Fund is proud to support a major river restoration success in Rochester! The ARM Fund helps restore and protect New Hampshire’s waters and wetlands. Recently, the ARM Fund Program contributed to a transformative restoration effort along the State designated Cocheco River corridor with the removal of two aging dams.
In 2025–2026 the Gonic Dam and Gonic Sawmill Dam were removed, eliminating long standing safety risks and allowing the river to return to its natural flow. With the river reconnected to its floodplain, floodwater can now spread out, deposit sediments and improve water quality. A newly constructed riffle adds natural river features like resting pools and boulder clusters, boosting habitat for fish and other aquatic species. Removing these dams has also reopened more than 22 miles of aquatic species passage throughout the Cocheco River system!
The ARM Fund supports five years of monitoring, native buffer plantings and permanent conservation restrictions on 3.4 acres along the western restored floodplain—ensuring long lasting protection of these important waters. A healthier river, safer community and stronger habitat—all made possible through partnership, science and the commitment to restoring New Hampshire’s natural resources.
