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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.

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 - FEMA has finalized scopes of work for new mapping projects based on the results of a Discovery project to determine flood map update needs in the watersheds. Field surveys and updated flood analyses are currently being performed.
  • 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. 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 – Field surveys to support updated flood hazard analyses are currently being performed. 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 - Field surveys to support updated flood hazard analyses are currently being performed. Updated flood maps will be prepared following completion of the surveys and the new analyses.
  • Rockingham County Coastal Study - FEMA is moving forward with finalizing preliminary flood maps issued in 2014 and 2016. The maps will become effective 6 months after the issuance of a Letter of Final Determination (LFD) to affected communities. It is not currently known when the LFDs will be issued.
  • Salmon Falls—Piscataqua Rivers Watershed (Inland) - Preliminary flood maps showing revised flood hazard information will be distributed following the LFD issuance for the coastal project above since some map panels are affected by both projects.
  • 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.
  • Town of Lincoln Levee Mapping Project - A revised preliminary map will be prepared and issued following completion of levee reconstruction and levee accreditation.
  • 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. Local officials from communities in the watershed have been invited to a virtual Discovery Meeting on May 26, 2020 to learn more 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. Local officials from communities in the watershed have been invited to a virtual Discovery Meeting on May 26, 2020 to learn more 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.

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.

Portable Document Format Symbol Portable Document Format (.pdf). Visit nh.gov for a list of free .pdf readers for a variety of operating systems.

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