Methuen, MA Environmental Rules: Flood Elevation Requirements (2026)

The elevation control in the City of Methuen is a rise limit, not a freeboard height. Section 11.17(B)(1) of the Methuen Comprehensive Zoning Ordinance says that within Zone A the best available floodway data must be used to prohibit encroachments in floodways that would result in any increase in the base flood discharge. In Zones A1-30 and AE along watercourses without a designated regulatory floodway, no new construction, substantial improvement or other development is permitted unless it is demonstrated that the cumulative effect of the proposed development, combined with all other existing and anticipated development, will not increase the water surface elevation of the base flood more than one foot at any point within the community. The applicant carries that burden of demonstration.

The ordinance defines the base flood as the flood having a 1% chance of being equaled or exceeded in any given year, also called the 100-year flood. Under § 3.3(P), the exact boundaries of the Floodplain District can be defined by the 100-year base flood elevations shown on the FIRM and in the Flood Insurance Study booklet dated June 18, 1987. Plans must include existing contour intervals of the site and the elevation of existing structures under § 11.17(B)(3). Within Zones AH and AO, plans must provide adequate drainage paths around structures on slopes.

Section 11.17 also incorporates the construction requirements of the Massachusetts State Building Code for the floodplain (currently Section 744) by reference. A substantial improvement is any repair, reconstruction or improvement whose cost equals or exceeds 50% of the structure's market value, measured before the work starts or, for a damaged structure, before the damage occurred. Work solely needed to meet health, sanitary or safety code specifications, and alterations to structures listed on the National Register of Historic Places or a State Inventory of Historic Places, are excluded.