Stage 1 fire restrictions, enacted for unincorporated areas of western Boulder County.

Z-23-0001 Zoning Map Amendments to the Floodplain Overlay District

Z-23-0001 Zoning Map Amendments to the Floodplain Overlay District

Docket Z-23-0001 – Approved March 26, 2024

The Board of County Commissioners approved zoning map amendments in Docket Z-23-0001 at a public hearing on March 26, 2024. View Resolution 2024-032.

The Proposed Map Amendments were approved for incorporation into the Floodplain Overlay District, effective March 26, 2024 for the portion of Lefthand Creek affected by the Scientific Resolution Panel re-study (between Geer Canyon and 49th Street) and an effective date coincident with the FEMA effective date, on or after September 26, 2024, for the rest of the Proposed Amendments.

Visit the Floodplain Remapping Project webpage to learn more about the project, sign up to receive texts and/or email alerts, and to view the current and proposed floodplain maps.

Past Meetings

March 26, 2024 – Board of County Commissioners (BOCC) Public Hearing: Docket Z-23-0001: Zoning Map Amendments to the Floodplain Overlay District

Jan. 17, 2024 – Planning Commission Hearing: Amendments to the Boulder County Floodplain and Floodway based on FEMA’s Physical Map Revision reflecting the Colorado Hazard Mapping Program (CHAMP) study.

Dec. 13, 2023 – Virtual General Countywide Floodplain Remapping Informational Meeting

Nov. 30, 2023 – Floodplain Remapping Meeting for Residents on Lefthand Creek Between Geer Canyon and 49th St.

  • Boulder County Parks and Open Space, Longmont
  • Property owners in this area were sent a letter with a meeting invitation, although the meeting was to the public
  • Meeting Presentation

Public Comment Period Nov. 15 – Dec. 31, 2023

The public was invited to provide written comments on the proposed changes to the Boulder County Floodplain and Floodway through Dec. 31, 2023. All comments become part of the public record and will be provided to the Planning Commission and Board of County Commissioners for their consideration.


The 2013 Flood event caused widespread damage along waterways throughout Boulder County and other areas of the state. In response, the State of Colorado took steps to bolster long-term planning and resiliency efforts by funding Colorado Hazard Mapping Program (CHAMP), managed by the Colorado Water Conservation Board (CWCB). CHAMP is updating local hazard information, including producing new regulatory floodplain maps for the most affected waterways.

The county’s Floodplain Overlay District is comprised of both the FEMA Floodplain and Floodway and the Boulder County Floodplain and Floodway. The county has already incorporated draft CHAMP data into the Boulder County Floodplain and Floodway via Resolutions 2017-68, 2018-78, and 2020-11.

In July 2023, FEMA released revised Preliminary Flood Insurance Rate Maps (Preliminary FIRMs) based on the CHAMP remapping efforts. The revised Preliminary FIRMs differed from the already adopted draft CHAMP maps in eight areas where FEMA approved changes submitted during FEMA’s 2020 and 2021 appeal periods. The appeals included a Scientific Resolution Panel for portions of Lefthand Creek. We expect the revised Preliminary FIRMs will become the future effective FIRMs in the autumn of 2024.

In accordance with Section 4-403 of the Land Use Code, it is necessary to amend the Boulder County Floodplain to incorporate the changes FEMA made during their appeal resolution process. Aligning the Boulder County Floodplain and Floodway with the revised Preliminary FIRMs will reflect the best available flood hazard data. Specifically, staff propose removing Boulder County Floodplain and Floodway for stream reaches included in the CHAMP study, such that the FEMA FIRM will be the only effective regulatory floodplain for CHAMP reaches after the FEMA map update.

Contact the Floodplain Admin

Phone: 720-564-2652

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Community Planning & Permitting - Floodplain Administration



2045 13th St.
Boulder, CO 80302

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Community Planning & Permitting
Floodplain Administration
P.O. Box 471
Boulder, CO 80306