Hansen Dam Wetlands Restoration

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The Hansen Dam Wetlands Restoration project works to mitigate stormwater pollution from a 133-acre Los Angeles River sub-watershed that flows into Hansen Lake. It utilizes features such as bio-swales, infiltration basins, treatment wetlands and native vegetation that blend into the region’s natural landscape to naturally cleanse pollutants and contaminants from the runoff.

The project redesigned and resurfaced portions of one parking lot and redirected rainwater flows from this and two other parking lots into a complex of constructed stormwater treatment wetlands. It resulted in beneficial water re-use and enhanced and created wetland and riparian habitat for wildlife.



  • Osborne Street at Foothill Boulevard in Council District 7



  • Los Angeles River


This project was a collaboration between the City of Los Angeles, Department of Public Works and the Mountains Recreation and Conservation Authority.


Proposition O provided $2,220,702 in funding for this project. Additional funding in the amount of $297,000 was provided by Caltrans-FTIP.