The map is a combination of the February 1996 Flood Inundation Area, shown on the Metro Flood Management Area map and the results of new hydraulic modeling on the Lower Willamette River applied to the Central and South Reaches of the river.For more information see: https://www.portland.gov/bds/floodplain-development-regulation-updates.--- Additional Information - Category: Hazard Purpose: Regulatory layer for Title 24.50 Flood Hazard Areas. Replaces Metro Title 3 1996 Flood Inundation Area referenced prior to March 1, 2024. Update Frequency: As Needed--- Metadata Link - https://www.portlandmaps.com/metadata/index.cfm?&action=DisplayLayer&LayerID=61134

The farthest extent of the land area comprised of the FEMA Special (100 year) Flood Hazard Area, the Modeled Willamette River 1996 Flood Extent, and the Metro Title 3 1996 Flood Inundation Area, for areas not included in the Modeled Willamette River 1996 Flood Extent.-- Additional Information: Category: Zoning Code Purpose: Reference layer for Title33 Planning and Zoning. Replaces prior references to FEMA 100-year floodplain in Title 33 prior to March 1, 2024. Different regulations are applied within the extent of this combined area. Update Frequency: As Needed-- Metadata Link: https://www.portlandmaps.com/metadata/index.cfm?&action=DisplayLayer&LayerID=61133