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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. For a list of all Discovery projects, including access to reports and meetings presentations, visit the FEMA Discovery Projects in New Hampshire webpage.

Community Adoption of New or Revised Flood Insurance Rate Maps

Each time FEMA provides a community with new or revised flood hazard data, the community must adopt new floodplain management regulations to incorporate any new data into the community’s ordinance and amend the community’s existing ordinance to reference the new FIRM and FIS report. FEMA’s Adoption of Flood Insurance Rate Maps by Participating Communities pdf file provides more information about this process. RSA 674:57 allows NH municipalities to adopt the new FIRM and FIS report through a resolution by the local governing body. Following the resolution passing, the statute also allows the municipality to amend its floodplain ordinance by replacing the old FIRM and FIS study date with the new FIRM and FIS study date without further action by the local legislative body.

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. You can view the location of each of these projects on our interactive map. To find out more about any of these projects, contact the NH Floodplain Management Program team.

  • Contoocook/Pemigewasset River Watersheds - FEMA has completed a Discovery project to determine flood map update needs in the watersheds. Work maps showing updated flood hazards to be incorporated into new flood maps are currently under development and will be shared with community officials when completed.
  • Merrimack River Watershed  pdf file - The development of revised flood maps based on updated engineering analyses and topographic information is currently underway. Meetings were held to review work maps showing flood hazard changes with community officials in July 2019. Issuance of preliminary flood maps will be the next step in the map update process.
  • Middle Connecticut Watershed pdf file – Updated flood hazard analyses are currently being performed based on recently completed field surveys . Updated flood maps will be prepared following completion of the surveys and the new analyses.
  • Nashua River Watershed pdf file - Updated flood analyses are complete and revised floodplain mapping is underway. Meetings with community officials to review draft work maps happened in November 2019. Issuance of preliminary flood maps will be the next step in the map update process.
  • Millers Watershed pdf file - Updated flood hazard analyses are currently being performed. Updated flood maps will be prepared based on the analyses following completion.
  • Rockingham County Coastal Study - FEMA issued a Letter of Final Determination for this project on July 29, 2020. The new maps are effective January 29, 2021. More information about this project is available on the Rockingham County Coastal Project webpage.
  • Salmon Falls—Piscataqua Rivers Watershed (Inland) - Preliminary flood maps showing revised flood hazard information are currently under development. This project is currently on hold pending funding.
  • Town of Farmington Levee Mapping Project - A web-based meeting with community officials was held March 31, 2020 to kick off this Levee Analysis and Mapping Project. Initial re-mapping options of the project area were shared with community officials in 2020.
  • Town of Lincoln Levee Mapping Project - A revised preliminary map will be prepared and issued following completion of levee reconstruction and levee accreditation.
  • Upper Androscoggin River-Headwaters Connecticut River Watershed - FEMA has initiated a Discovery project to determine whether a flood map update project is needed for the area, and if so, what the scope of the project will be. A virtual Discovery Meeting was held November 17, 2020 to provide community officials with information about the project.
  • Waits River-Connecticut River Watershed - FEMA has initiated a Discovery project to determine whether a flood map update project is needed for the area, and if so, what the scope of the project will be. A virtual Discovery Meeting was held on May 26, 2020 to provide community officials with information about the project. Additional details are available on the U.S. Geological Survey project webpage.
  • Ammonoosuc River-Connecticut River Watershed - FEMA has initiated a Discovery project to determine whether a flood map update project is needed for the area, and if so, what the scope of the project will be. A virtual Discovery Meeting was held on May 26, 2020 to provide community officials with information about the project. Additional details are available on the U.S. Geological Survey project webpage.
  • 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.

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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