Floodplain Mapping – How to Stay Informed

Floodplain Mapping - How to Stay Informed

Boulder County is committed to keeping the public informed about the mapping update program in an accurate and timely fashion.


Newsletters will be produced and disseminated throughout the duration of the program to provide property owners and other interested parties with regular updates. The newsletters will contain information on regulatory floodplains, the National Flood Insurance Program, Code Amendments, and other relevant topics.

Email Listservs

Signup to receive timely information on the program by subscribing to the project email list.

Public Hearings

The public hearing process for adopting new floodplain mapping and associated code amendments requires that staff recommendations are presented at one or more Planning Commission public hearings, and then, upon approval, brought to the Board of County Commissioners for another public hearing where a decision on the staff recommendation is made.

The Phase I draft floodplain maps will be presented along with Floodplain Overlay District code text amendments at a Planning Commission hearing. More information, including details about the hearing date and time is available on 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 for this project.

Public Meetings

Public meetings for the Phase I floodplain mapping areas were held from December 2016 through February 2017 and were hosted in locations throughout the county near the waterways that were under review. The goal of the meetings was to gather additional information that could inform the draft mapping prior to the initial submission of the mapping data for FEMA review. All future floodplain remapping public meetings will serve the same purpose for future datasets.

Upcoming Public Meetings

Tuesday, May 9, 2017
5:30 to 7:30 p.m.
Boulder County Parks & Open Space Building – Prairie Room
5201 St. Vrain Road in Longmont

This meeting will include draft floodplain maps for reaches of the Little Thompson River within Boulder County. These extents include:

  • Little Thompson West Fork – including Hemlock Drive, Hickory Drive, and County Road 82E
  • Main stem including W County Road 2 to North 83rd Street
  • The Little Thompson River reaches within Boulder County are being reviewed as part of Phase II of the CHAMP study, which will officially begin in late 2017/early 2018

Viewing Draft Floodplain Data Online

Draft floodplain data is published on the county’s map review platform. Final drafts for adoption will be posted at least one week prior to the scheduled Planning Commission hearing. This data is subject to change until it is officially adopted by FEMA – the county adoption process is underway to allow regulatory decisions to be made on the best available data.

Previous Meetings:

  • Feb. 23, 2017 – This meeting was cumulative and included maps from each area that has been discussed at other public meetings (see dates below for info). Comments on all released draft maps were due by 11:59 p.m. on Monday, March 13.
    • New areas discussed at thsi meeting – North Boulder Creek from CO Hwy 72, Middle Boulder Creek from west of Eldora to Nederland, and South Boulder Creek from the county line to Gross Reservoir
    • Meeting handouts
  • Jan. 31, 2017 – Stream reach specific public meeting for project areas including – Two Mile Canyon Creek, Lower Boulder Creek east of 61st Street, South Boulder Creek from Gross Reservoir to Eldorado Springs townsite, Boulder Creek from Barker Reservoir to upstream of Eben G. Fine Park, Rock Creek, and Coal Creek
  • Jan. 10, 2017 – Stream reach specific public meeting for project areas including – Fourmile Canyon Creek (above Wagonwheel Gap Road), Dry Creek #2, New Dry Creek, Resilient St. Vrain Study Area
  • Jan. 18, 2017 – Boulder County Planning Commission Public Hearing/Study Session
  • Jan. 19, 2017 – Stream reach specific public meeting for project areas including – Cabin Creek AND North/Middle/South St. Vrain creeks between CO Hwy 72 and Longmont Dam Road
  • Dec. 13, 2016 – Community map review session for RiskMAP project areas near Lyons
  • July 14, 2016 – status report on the floodplain mapping process and update on code amendments
  • July 26, 2016 – Status report on proposed updates to county’s floodplain regulations

Boulder County Program Contact

  • Erin Cooper – Floodplain Specialist – 720-564-2866 or email

Contact Us

Floodplain Administrator Contact

Floodplain Administrator



2525 13th Street
Boulder, CO 80304

Map & Directions

Hours: 8 a.m. - 4:30 p.m. M-F

Mailing Address

P.O. Box 471
Boulder, CO 80306