Concord River Watershed - Flood Maps
Please note: the information contained herein is meant solely to provide guidance to property owners based on the 2014 FEMA FIRM maps and guidance documents provided by FEMA. For more specific information, please consult the lists of additional links.
INTERACTIVE MAPPING TOOL: FIND YOUR PROPERTY
(click icon to enter site, then click on each data layer for more information)
How can I view the new maps?
The maps are available in three formats on this webpage:
1. The most user-friendly option is the INTERACTIVE MAPPING TOOL that allows a property owner to search for his/her address and see how it will be impacted by the updated flood plain boundary.
2. There is a link above to the actual FEMA FIRM maps (FIRM Maps - Large .pdf Files), where you can download the maps. But beware - some maps are about 5 MBs. First check the Index (Index1B) to find out which panel your property is on.
What data was used in determining the FEMA FIRM maps?
For many flooding sources throughout the Concord River Watershed, the Special Flood Hazard Areas (SFHAs) and Base Flood Elevations (BFEs) were produced using new hydrologic and hydraulic analyses as well as 2-foot topographic data obtained through Light Detection and Ranging (LiDAR). In areas where there were no new studies or information, the current effective digital SFHA was incorporated into the new base map.
What does this mean for property owners?
Impacts to property owners will vary. The best way to determine whether your property and/or structure is in a SFHA, and if there has been a change to the SFHA or BFE in your area, is to consult the Town of Concord's Interactive Mapping Program (see link above). The hard copy maps are also available in the Planning or Natural Resources Division offices at 141 Keyes Road, Concord, MA. The office hours are 8:30 a.m. to 4:30 p.m. Monday through Friday, and staff will be available to help you interpret the maps as needed.
What if I disagree with the maps?
FEMA applies rigorous standards to develop Flood Insurance Rate Maps (FIRMs) and uses the most accurate hazard information available. However, limitations in the scale or topographic detail of the source maps used to prepare a FIRM may cause small elevated areas to be included in a Special Flood Hazard Area (SFHA). SFHAs are high-risk areas subject to inundation by the base (1-percent-annual-chance) flood. They are also known as 1-percent-annual-chance floodplains, base floodplains, or 100-year floodplains. To change the flood hazard designation for properties in these areas, FEMA has established the Letter Of Map Amendment (LOMA) process for properties on naturally high ground and the Letter Of Map Revision-Fill (LOMR-F) process for properties elevated by the placement of fill. LOMAs and LOMR-Fs are letter determinations
that officially amend an effective FIRM. They can establish that a property is not in an SFHA and, by doing so, remove the Federal flood insurance requirement. For more information, please see the LOMA & LOMR-F Fact Sheet link above.