Floodplain Development Permits

A floodplain development permit is required for all development in the floodplain.

Floodplain development permits:

  • must be obtained from the Transportation Department-Floodplain Management Program, before the start of construction,
  • require a floodplain development permit fee is $50; the fee is waived for projects directly related to the September 2013 flood event until further notice
  • applications should include the following information as applicable:
    • Development plan stamped by a Colorado Registered Professional including items listed in Section 4-407 of the Boulder County Floodplain Regulations
    • Location map (2000’ scale U.S.G.S. topo)
    • Valley cross-section at site
    • Construction and material specifications
    • Description of extent to which water course will be altered
    • Floodway analysis (if required)
    • Title report for Floodway Permit
    • Engineering report addressing those standards set forth in Section 4-407 of the Boulder County Floodplain Regulations.

Floodplain Development Permit Application

Floodplain Management provides more information on floodplain regulations, drainage, flood preparations, maps and requirements. To check to see if your property is within a regulatory floodplain go to Boulder County e-mapping (searchable property information).

2013 Flood-Related Bridge Construction

The September 2013 flood damaged or destroyed many private crossings throughout Boulder County. For more information about permit requirements, please visit the Bridge Construction Permit Requirements page.

2013 Flood-Related Stream Restoration

The September 2013 flood impacted by the hydraulic and ecological conditions of many watersheds throughout the county. Visit the Stream Restoration Permit Requirements webpage for more information. 

Interim Floodplain Map

Interim floodplain maps based on information obtained after the September 2013 flood are now available. There are currently no floodplain development permit requirements for properties that are on the interim floodplain. However, Boulder County recommends considering the interim floodplain map when making development decisions.


Floodplain Administrator
2525 13th Street, Suite 203
Boulder, CO 80304
Map & Directions
Hours: 8 a.m.-4:30 p.m. M-F
Mailing Address
Main: PO Box 471
Boulder, CO 80306-0471