Flood & Hurricane Risk in Derry
Derry carries real, documented, but genuinely LOCALIZED flood risk along the Beaver Brook corridor (FEMA Zones A and AE) rather than a townwide flood hazard, while carrying no direct hurricane risk as an inland southern New Hampshire town.
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Learn moreReal, Localized Flood Risk Along Beaver Brook
Beaver Brook rises in neighboring Chester, NH and flows south through Derry (through Harantis Lake, Adams Pond, and Beaver Lake). The Town of Derry's FEMA-based Flood Insurance Rate Map (drawing on the Rockingham County Flood Insurance Study, dated May 17, 2005, as amended) designates real, current Zone A and Zone AE flood areas along that corridor -- this record discloses this as a real, but localized rather than townwide, hazard.
A Real Caveat on FEMA's Underlying Map Data
Sources reviewed this pass raised a real, genuine caveat directly: FEMA's underlying maps reflect historical data and do not fully account for today's heavier rainfall patterns or new upstream development, so a property near a brook, at the bottom of a slope, or downhill from new construction can carry real flood exposure even outside a currently-mapped zone.
No Direct Hurricane Risk, Consistent With Inland Southern New Hampshire
Derry -- an inland southern New Hampshire town -- carries no direct hurricane landfall risk, consistent with New Hampshire's broader statewide research context, though remnant tropical moisture can contribute to regional heavy-rain events.
No Meaningful Earthquake or Tornado Risk
Consistent with New Hampshire's broader statewide research context, Derry carries no meaningful tornado risk and only a real, low-level New England seismic-zone earthquake risk that produces rare, minor events rather than a significant hazard.
Confirm a Specific Property's Current Flood-Zone Status Directly
This record's own web-search budget was exhausted before a current First Street Foundation percentage-of-properties-at-risk figure specifically for Derry could be confirmed this pass -- a real, disclosed gap. Confirm a specific target property's current flood-zone status directly via FEMA's Map Service Center or the Town of Derry's own flood-zone lookup tools, and price separate flood insurance given standard homeowners policies' typical flood exclusion.
Key takeaways
- Derry carries real, documented, localized flood risk along the Beaver Brook corridor (FEMA Zones A and AE), rather than a townwide hazard.
- FEMA's underlying maps reflect historical data and may understate current risk for properties near waterways, slopes, or new upstream development.
- Derry carries no direct hurricane risk as an inland town, and no meaningful tornado or significant earthquake risk.
- Confirm a specific property's current flood-zone status directly via FEMA maps -- this record could not confirm First Street's precise percentage figures for Derry this pass.
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