Office of Strategic Initiatives - an official NH Government website
Smaller text size Reset text size Larger text size
link to website translation page

Current NH Floodplain Mapping Activities

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

Risk MAP Program

FEMA’s current mapping program is 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

FEMA Risk MAP Mapping Projects in New Hampshire:

The first step in a Risk MAP 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 following mapping projects are now underway:

  • Contoocook/Pemigewasset Watersheds - A Discovery project to determine flood map update needs is underway. Discovery Meetings with local officials were held on December 11th and 12th, 2018 to gather input.
  • Coos County Mapping Project - Zone A floodplain boundaries are being updated and Zone AE areas redelineated 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 early 2019 followed by issuance of preliminary flood maps.
  • Nashua River Watershed pdf file - Updated flood analyses were expected to be completed in 2018. Updated maps based on the analyses and new topographic information will be developed once that work is complete.
  • Rockingham County Coastal Study: FEMA is moving forward with finalizing preliminary flood maps issued in 2014 and 2016. It is expected they will become effective sometime in late 2019 or early 2020.
  • Salmon Falls—Piscataqua Rivers Watershed (Inland) - Preliminary flood maps showing revised flood hazard information based on engineering analyses and new topographic information are currently being prepared. An issue date is yet to be determined.
  • 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

Portable Document Format Symbol Portable Document Format (.pdf). Visit 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