Floodplain Mapping and Code Amendments

Floodplain Mapping and Code Amendments

The Boulder County Land Use Code regulates development in Unincorporated Boulder County. The county is making revisions to Article 4-400 of the Code which outlines regulations specific to the Floodplain Overlay District. Boulder County is in the process of revising the Floodplain Overlay District section of the code. This webpage provides details on the nature and scope of the changes.

What is happening in 2017?

Newly updated floodplain mapping studies are underway for waterways throughout Unincorporated Boulder County that were most affected by the 2013 flood. These maps help to identify risk for property owners and enable proactive measures to protect people and property. More background on the goals for this new mapping can be found on the Land Use Docket webpage.

Draft floodplain maps from Phase I of the Colorado Hazard Mapping Program (CHAMP) went through detailed reviews and public outreach and have been adopted as best available data in a regulatory update to the Floodplain Overlay District (effective June 1, 2017). These maps include revised or new regulatory flood risk zones throughout the portions of waterways in unincorporated Boulder County that are in the CHAMP Phase I study (see a list of these waterways). Alongside this zoning amendment, additional text amendments to clarify changes to Article 4-400 of the Boulder Land Use Code were approved by the Board of County Commissioners for adoption.

Public Hearing Process and Information

The Phase I draft floodplain maps were presented along with the Floodplain Overlay District code text amendments at a Planning Commission hearing in April 2017. These recommended amendments were approved for recommendation to the Board of County Commissioners (BOCC) at this hearing. After being presented to the BOCC in May 2017, the proposed amendments were approved for adoption as regulatory measures and became effective as of June 1, 2017.

More information, including details about future hearing dates and times, will be available on the Floodplain Remapping Project home page and the Land Use docket webpage. Check back regularly for updates and new hearing information. We also suggest looking at the Board of County Commissioners agenda and the Planning Commission agenda to stay up-to-date on scheduled activities surrounding this project.

Comment Responses

Public meetings were held from December 2016 to February 2017 and input provided by community members during this time helped to refine the draft mapping. Comments submitted by community members have been reviewed by the CHAMP team and responses were provided for technical questions/concernts. These public comments and responses are available on the Land Use docket webpage via the Staff Report.

What Code amendments happened in 2016?

The Boulder Land Use Code was amended and these changes went into effect on Oct. 17, 2016. The aim was to update language to more accurately reflect the intent of the Code, make the Code easier to understand and use, enable the adoption of best available data (such as new draft floodplain maps) for regulatory purposes, and to protect the health, safety, and welfare of county residents in the event of future floods.

Previous Public Meetings

Review presentations and documents associated with the 2013 Land Use code text amendments to floodplain regulations.

Contact Us

Floodplain Administrator Contact

Floodplain Administrator


Floodplain Remapping Program Contact



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Boulder, CO 80304

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