View Maps and Provide Feedback
The interactive web map (use the button above) shows detailed flood risk zones and related FEMA map amendments that are currently regulated throughout unincorporated Boulder County as Floodplain Overlay Zoning District. This map will update as new FEMA maps become effective throughout Boulder County and as the Boulder County Board of County Commissioners (BOCC) adopts best available information.
The Boulder County Regulatory Flood Risk Zones were updated on Jan. 10, 2020, to reflect changes to the Floodplain Overlay District based on FEMA’s Preliminary Flood Insurance Rate Maps (FIRMs) for stream reaches studied by the Colorado Hazard Mapping Program (CHAMP). The Preliminary FIRMs were adopted by the BOCC via Docket Z-19-0001.
In July 2023, FEMA released revised Preliminary Flood Insurance Rate Maps (Preliminary FIRMs). The revised Preliminary FIRMs differ from the already adopted CHAMP maps in eight areas where FEMA approved changes submitted during FEMA’s 2020 and 2021 appeal periods. We expect the revised Preliminary FIRMs will become the effective FIRMs in 2024. At that time, the updated CHAMP mapping will be used for flood insurance purposes.
Visit the interactive web map (use button above) to view FEMA’s Revised Preliminary Flood Insurance Rate Maps (FIRMs) for stream reaches studied by CHAMP, as well as proposed changes to the Boulder County Floodplain and Floodway.
New Information
- Docket Z-23-0001 – Zoning Map Amendments to the Floodplain Overlay District
- Floodplain Mapping – How to Stay Informed – Information on upcoming public meetings and hearings
- Subscribe – Receive newsletters and timely information by email