Boulder Creek Floodplain Mapping Update
The Boulder Creek Floodplain Mapping Study evaluated the floodplain from the area east of the confluence with Fourmile Canyon Creek, approximately three-quarters of a mile east of 61st Street, upstream to the mouth of Boulder Canyon west of Boulder's city limits. The study area encompassed a reach length of seven miles.
Based on this study, the city has developed new floodplain maps for Boulder Creek that would potentially replace both the Federal Emergency Management Agency (FEMA) Flood Insurance Rate Map (FIRM) and the City of Boulder floodplain map.
The proposed floodplain maps are being developed based on:
View the revised Boulder Creek floodplain maps.
The final project documentation was submitted to FEMA for review and approval in December 2012.
City Council Public Hearing
Planning Board Public Hearing - March 15, 2012
Water Resources Advisory Board (WRAB) Public Hearing – Feb. 27, 2012
As a result of the proposed floodplain boundary changes, 106 buildings would no longer be affected by the 100-year floodplain, 72 buildings would be newly affected, and 574 buildings would remain in the floodplain. As the data is refined and public input is received, these numbers may change slightly, but the general trends will remain the same. Changes to the floodplain maps can affect flood insurance requirements - learn more.
The maps below indicate the differences in between the old and new floodplain designations.
Please Note: These maps may not be completely comprehensive due to data limitations. Staff will continue to make enhancements and modifications as the floodplain mapping process moves forward.
Please note: Boulder Slough hydraulic modeling has been suspended to allow the project team to focus on the more critical work associated with the Boulder Creek floodplain. The Boulder Slough is the old-flow path of Boulder Creek that separates from the Boulder Creek floodplain at approximately 17th Street and joins the South Goose Creek floodplain east of Foothills Parkway.
Last Updated on Friday, 15 February 2013 16:35