Flood Zones in Bandon: Two Different Maps, Two Different Risks

FEMA's Standard Floodplain: Roughly 617 Parcels

The City of Bandon's own flood-plain materials describe approximately 617 individual parcels within city limits as partially or entirely located inside the FEMA-mapped floodplain -- the standard, familiar National Flood Insurance Program (NFIP) map most coastal buyers already know from other markets, covering the roughly 1-in-100-chance-per-year ("100-year") flood event. In Bandon's case, this floodplain is driven by a combination of high tides, storm surge along the Coquille River's tidal reach, and heavy winter rainfall, plus dune overtopping capable of producing shallow flooding on some oceanfront property when a big surge event coincides with a high tide.

This mapped floodplain concentrates in Old Town Bandon -- the historic district between US Highway 101 and the Coquille River, home to the Port of Bandon marina, a fish processing plant, and other commercial and light-industrial buildings on relatively low ground near the river -- and in other low-lying areas near the river and its tidal sloughs. The Oregon Department of Geology and Mineral Industries (DOGAMI) has separately produced FEMA Flood Zone Change Maps for Bandon and other Coos County communities, refining the underlying flood-hazard data over time. The City of Bandon participates in the NFIP, meaning federally backed flood insurance is available regardless of whether a specific structure sits inside or outside the mapped zone.

The Separate, Much Bigger Map: DOGAMI's Cascadia Tsunami Inundation Zones

Completely separately from the standard FEMA floodplain, Oregon's DOGAMI has published official tsunami inundation maps specifically for Bandon (catalogued as TIM-Coos-16), modeling five distinct earthquake-and-tsunami scenarios sized like T-shirts -- Small, Medium, Large, Extra Large, and Extra Extra Large -- each accounting for the ground subsidence a major Cascadia earthquake would cause and the wave-amplifying effect of an offshore splay fault. This is a fundamentally different, much larger hazard zone than the standard FEMA floodplain: it maps what would happen not in an ordinary storm-tide flood, but in the aftermath of a major Cascadia Subduction Zone earthquake generating a tsunami.

Separate academic modeling constructed 15 detailed megathrust earthquake scenarios specifically for Bandon, finding shoreline wave elevations ranging from roughly 4 meters up to about 25 meters depending on the magnitude (modeled between M8.7 and M9.2) and the amount of fault slip involved. That same research found a majority of Bandon's population -- described as roughly 68% -- falls within the largest modeled inundation zone (XXL), a notably high share compared to many other Oregon coastal communities studied. This page treats that 68% figure as a directional finding from the cited research rather than a precisely confirmed current percentage, since population and development patterns shift over time; the DOGAMI maps themselves remain the authoritative reference for a specific parcel's tsunami zone status.

Why the Two Maps Don't Line Up

A property can sit entirely outside the standard FEMA floodplain -- meaning a mortgage lender won't require flood insurance, and normal storm-tide flooding isn't a realistic concern -- and still sit well inside DOGAMI's mapped tsunami inundation zone, because the physical mechanisms are completely different. A parcel elevated well above the Coquille River's tidal reach and outside any storm-surge path can still be within reach of a tsunami wave that DOGAMI's modeling puts at up to roughly 25 meters at the shoreline in the largest scenarios. Conversely, tsunami-zone status doesn't factor into standard NFIP flood insurance requirements or rates at all -- the two systems are administered separately, by different agencies, for different purposes (routine insurance underwriting versus emergency evacuation planning).

For a buyer, this means asking two separate questions about any specific Bandon address, not one: what is this property's FEMA flood zone (relevant to insurance requirements and routine storm-tide flood risk), and what is this property's DOGAMI tsunami inundation zone (relevant to evacuation planning and the low-probability, high-consequence Cascadia scenario)? A real estate agent or seller's disclosure focused only on the standard FEMA flood zone may not mention tsunami zone status at all, since it isn't typically a mandatory disclosure item the way flood zone status often is.

Where to Check Both Zones for a Specific Property

For the FEMA floodplain: check FEMA's official flood map service, and confirm with the City of Bandon Planning Department, which maintains local floodplain administration and can state a specific parcel's zone designation directly. For the DOGAMI tsunami inundation zone: DOGAMI's own published tsunami inundation maps for Bandon (TIM-Coos-16) and Oregon's statewide tsunami evacuation zone viewer (accessible through Oregon's emergency management resources) both allow a specific-address lookup. Neither this page nor any general online source should be treated as authoritative for a specific parcel -- both are official government map products designed for exactly this kind of individual-property lookup.

What This Page Doesn't Cover

This page explains the structural difference between Bandon's standard FEMA floodplain and DOGAMI's separate tsunami inundation mapping, and cites the general figures (roughly 617 flood-exposed parcels; roughly 68% of the population within the largest modeled tsunami zone per one academic study) that this research could source. It does not state the specific flood zone or tsunami zone for any individual address -- that requires a direct lookup through FEMA's flood map service and DOGAMI's tsunami inundation map tool. See this site's Hurricane & Storm Risk page for the fuller Cascadia Subduction Zone earthquake and tsunami risk picture. Nothing on this page is engineering, insurance, or emergency-planning advice.