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There are over 4,800 dams in New Hampshire. Many were built over a century ago, and played a role in New Hampshire's economic growth. But as New Hampshire has changed, so too has the need for some of its dams. Many New Hampshire dams have recreational uses, such as boating, fishing, and swimming. A smaller number of New Hampshire's dams provide important services such as fire protection (provided by 8 percent of active dams statewide), hydropower production (5 percent), water supply (3 percent), and flood control (2 percent).