Proposed Draft Floodplain Mapping
Following the 2013 flood, the Colorado Water Conservation Board (CWCB) initiated a program to re-map the predicted 1% chance regulatory floodplain (100-year flood zone) of the most affected waterways. The program was named the "Colorado Hazard Mapping Program" or "CHAMP."
The CWCB draft floodplain maps will reflect changes to waterways caused by the 2013 flood and the recovery work since that flood. They'll also utilize more accurate data and advanced technology than was available when the current maps were created. As a result, the CWCB draft maps will be a more accurate representation of the anticipated 1% annual flood elevation and therefore more precisely reflect the flood risk for residents than the existing regulatory floodplain maps.
More Information on CHAMP >>
Town of Lyons Draft Floodplain Maps
The Town is currently reviewing the proposed new floodplain maps, within Town limits. The working draft map can be found here. Upon thorough Town review, the public will be invited to comment.
Town of Lyons Proposed DRAFT Floodplain Maps >>
The Town has also provided the current floodplain maps, adopted by FEMA in 2012.
View Current Floodplain Maps >>
Unincorporated Boulder County Draft Floodplain Maps
Boulder County has prepared draft floodplain maps for unincorporated Boulder County. Residents within the project area along the North and South St. Vrain creeks and St. Vrain Creek (Longmont Dam Road and Red Gulch Road to Lyons and from Lyons east towards Airport Road) are invited to meet with state and county staff to review draft map data for these reaches. A formal presentation will be followed by an opportunity for attendees to take part in a hands-on map review session with state and county staff.
Details of the draft map review session for St. Vrain Creek reaches in unincorporated Boulder County:
Date: Tuesday, Dec. 13, 2016
Time: 6 to 8 p.m.
Location: The River Church | 18668 N. St. Vrain Rd., Lyons, CO 80540
More Information on Unincorporated Boulder County Draft Floodplain Maps >>