FEMA flood zone rules in Beaverton, OR — also called floodplain regulations or special flood hazard area (SFHA) rules — determine flood insurance requirements and elevation standards for new construction.
Beaverton participates in FEMA's National Flood Insurance Program and regulates development in mapped Special Flood Hazard Areas under the Beaverton Development Code Chapter 60.05 (Special Districts and Overlay Zones, including Floodplain). The primary Beaverton floodplains follow Beaverton Creek, Fanno Creek, Johnson Creek, and Hall Creek (FEMA Zone AE). New construction and substantial improvements in SFHAs must meet elevation, floodproofing, and Oregon-specific PICM (Pre-Implementation Compliance Measures) habitat-protection standards.
The City of Beaverton is an NFIP-participating community and regulates floodplain development under the Beaverton Development Code (BDC) Chapter 60.05, which establishes overlay districts including the Floodplain District applied to mapped Special Flood Hazard Areas. The primary floodplains within Beaverton are along Beaverton Creek, Fanno Creek, Johnson Creek, and Hall Creek (designated FEMA Zone AE on the Effective Flood Insurance Rate Maps for Washington County). New construction and substantial improvements (work valued at 50 percent or more of the structure's pre-improvement market value) in SFHAs must elevate the lowest floor to or above the Base Flood Elevation plus the city's freeboard requirement, or be dry-floodproofed for non-residential uses. Development in the regulatory floodway is restricted to ensure no rise in Base Flood Elevation, supported by a registered engineer's no-rise certification. Oregon's 2024 NFIP-ESA Pre-Implementation Compliance Measures (PICMs), arising from the National Marine Fisheries Service Biological Opinion for the NFIP, add 'no net loss' standards for floodplain storage, riparian habitat, and water quality for ESA-listed salmon species, which Beaverton implements as a participating community. Beaverton Planning maintains the city floodplain mapping viewer and reviews all floodplain development permits.
Floodplain development without permit, or in violation of elevation, freeboard, or floodway no-rise standards under BDC Chapter 60.05, may trigger stop-work orders, after-the-fact permitting, mandatory removal, and code-compliance penalties. Substantial NFIP non-compliance also risks community probation and suspension from the flood-insurance program.
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