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New Hampshire Department of Environmental Services

Route 101 mitigation site a

Land development and other human activities that require dredging, filling, and construction in wetland and surface water resources can result in significant impacts on the environment. These impacts affect the functions and values of wetlands and surface waters, such as wildlife habitat, water quality renovation, or flood storage and desynchronization, among others.

The purpose of mitigation is to achieve no net loss of wetland functions and values from development projects. A functional assessment is an evaluation of a wetland to determine the functions and values it performs within the context of the broader landscape needs to be completed by a qualified professional. Once the functions and values to be lost are identified, compensatory mitigation can be provided to achieve the replacement or protection of similar functions and values lost through a project.

When the impacts are significant, the permittee is required to compensate for the loss of the functions and values. NHDES requires that certain projects mitigate for the impacts by conducting one (or more) of the following activities:

  1. Restoring a previously existing wetland
  2. Creating a new wetland, or
  3. Preserving land (at least 50 % upland) to protect the values of the adjacent wetlands or water resource.

Since 1967, New Hampshire has required permits for such activities. While state law requires that dredging and filling of jurisdictional areas must be avoided and impacts minimized, More than 2,000 permits each year are issued for unavoidable impacts.

NH Department of Environmental Services | 29 Hazen Drive | PO Box 95 | Concord, NH 03302-0095
(603) 271-3503 | TDD Access: Relay NH 1-800-735-2964 | Hours: M-F, 8am-4pm

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