Boulder Completed Alpine-Balsam Flood Mitigation Project
The city and the Mile High Flood District have removed the site from the local floodplain.
Updated on Sept. 28, 2026 in Safety
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Boulder officials and the Mile High Flood District have finalized the Alpine-Balsam flood mitigation channel. This completed infrastructure project officially removes the site from the designated flood zone.
Why it matters
The drainage improvements significantly reduce flood risks for the surrounding neighborhood while creating safe conditions for future development. By eliminating flood zone constraints, the city can now move forward with planned affordable housing projects on the land.
The drainage channel project has effectively removed the entire Alpine-Balsam site from the flood zone. The project integrated new landscaping and habitat features into the drainage corridor.
The players
City of Boulder
This is the municipal government responsible for overseeing public works and land use planning within Boulder, Colorado.
Mile High Flood District
This regional agency provides flood management and water quality services for communities in the Denver metropolitan area.
The details
Engineers constructed a drainage channel designed to mitigate flood risk for the immediate neighborhood. Beyond flood protection, the site now includes new pedestrian and bicycle pathways connecting Broadway to North Boulder Park, alongside a new plaza and improved crossings.
Timeline
September 23, 2026: The city announced the completion of the flood mitigation project.
Seasonal Patterns
This project aligns with long-term flood mitigation goals established for the Upper Goose Creek watershed. The completion follows a pattern of recent infrastructure improvements aimed at securing urban zones against historical hydrological risks.
Residents in the Alpine-Balsam area now benefit from reduced flood risk and new public accessibility features. The site is now open for pedestrian and bicycle use between Broadway and North Boulder Park.
The takeaway
The successful removal of this site from the floodplain demonstrates the value of proactive infrastructure investments. Residents can now anticipate the site being utilized for future affordable housing rather than remaining restricted by flood risks.
Further reading
For more information on municipal protection efforts, visit the Safety section.
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