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Current NH Floodplain Mapping Activities

Information about FEMA's floodplain mapping activities currently underway in New Hampshire.

FEMA Risk MAP Program

FEMA’s current flood mapping program is called Risk MAP (Mapping, Assessment and Planning). The goal of the Risk MAP program is to deliver quality flood hazard data and maps that increase public awareness about flooding and lead to action that reduces risk to life and property. To learn more about Risk MAP in New Hampshire, view the 2015 New Hampshire Risk MAP Business Plan.  pdf file

The Risk MAP Discovery Process

The first step in a Risk MAP flood mapping project is called the Discovery process. Discovery is used to help determine whether a mapping project is actually needed, and if so, what the scope of the project will be. Several Discovery projects have recently been completed and the mapping projects listed in the section below are now underway in the state.

Risk MAP Flood Mapping Projects in New Hampshire

FEMA Risk MAP projects currently underway that affect communities in New Hampshire are listed below. Schedule information listed is provided courtesy of FEMA and is subject to change.

  • Contoocook/Pemigewasset Watersheds - A Discovery project to determine flood map update needs in the watersheds is underway with FEMA currently finalizing a project scope for map updates. Field surveys for updated flood analyses included in the project scope are expected to be performed in 2019.
  • Coos County Mapping Project - Zone A floodplain boundaries are being updated and Zone AE boundaries redrawn based on more recent/detailed topographic data. These updates will be incorporated into the flood maps at a later date.
  • Merrimack River Watershed  pdf file - The development of revised flood maps based on updated engineering analyses and topographic information is currently underway. Work maps are expected to be ready for review by community officials in 2019 followed by issuance of preliminary flood maps.
  • Middle Connecticut Watershed pdf file – Field survey work will be performed in 2019 as the first step in the development of revised flood maps based on updated engineering analyses and topographic information.
  • Nashua River Watershed pdf file - Updated flood analyses are expected to be completed in 2019. Updated maps based on the analyses and new topographic information will be developed once that work is complete. Preliminary maps are expected to be released in 2020.
  • Rockingham County Coastal Study - FEMA is moving forward with finalizing preliminary flood maps issued in 2014 and 2016. An anticipated effective date for the maps will be provided when available.
  • Salmon Falls—Piscataqua Rivers Watershed (Inland) - Preliminary flood maps showing revised flood hazard information based on new engineering analyses and topographic information are currently being prepared and are expected to be issued in 2019.
  • Waits/Pemigewasset Watersheds - Zone A floodplain boundaries have been updated using more recent/detailed topographic data and new engineering analyses. These updates will be incorporated into the flood maps at a later date.
  • Winnipesaukee River Watershed pdf file - Updated flood analyses are currently being performed which, along with new topographic data, will be used to create digital flood maps.

You can view the location of each of these projects on our interactive map.

To find out more about any of these projects, contact Samara Ebinger of OSI at

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NH Office of Strategic Initiatives
Governor Hugh J. Gallen State Office Park
Johnson Hall, 3rd Floor  |  107 Pleasant Street  |  Concord, NH 03301
(603) 271-2155  |  fax: (603) 271-2615