FEMA’s NFIP/ESA guidance forces county choices; staff to analyze costs and options

Benton County floodplain staff updated commissioners July 9 on recent FEMA materials that integrate National Flood Insurance Program requirements with Endangered Species Act compliance and outline interim implementation choices for Oregon communities.

Staff described the Path C guidance (customized community plans) and Table 1 no‑net‑loss mitigation ratios for floodplain functions (flood storage, water quality/impervious surface, riparian vegetation). The mitigation table includes ratios that range from 1:1 for impervious-area effects, to 2:1 for flood‑storage impacts and up to 3:1–6:1 for tree removal depending on diameter at breast height, plus multipliers for off‑reach mitigation.

A newly circulated FEMA pre‑implementation 'Pick'em' letter asks jurisdictions to select one of three interim approaches and report their choice to FEMA by Dec. 1, with reporting on key floodplain functions beginning Jan. 30, 2025. The three options are: adopt an interim model ordinance, require permit‑by‑permit habitat assessments prepared by a biologist, or temporarily prohibit development in mapped special flood hazard areas until final federal requirements are adopted. Staff warned that a lack of response would default jurisdictions to the permit‑by‑permit option.

Commissioners asked about local capacity to perform habitat assessments, possible technical assistance, and costs to landowners. Staff said FEMA may offer technical assistance and grants but cautioned small jurisdictions may lack in-house expertise. The board asked staff to prepare a cost‑benefit analysis, including likely staff time, area of affected special flood hazard zone, and estimated costs of parcel‑by‑parcel assessments.

What’s next: staff will return with a recommendation and cost estimates to inform the board’s Dec. 1 response to FEMA.