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Matilija Dam: A $300M Cleanup for a Concrete Giant
28 Aug
Summary
- The nearly 80-year-old dam is structurally unsound and filled with sediment.
- Removal aims to restore steelhead migration and prevent beach erosion.
- The dam removal and infrastructure upgrades are estimated to cost $300 million.
The Matilija Dam, a concrete structure built in 1947 on Matilija Creek, is nearing its removal, a process expected to cost approximately $300 million. For decades, the dam has been non-functional due to structural concerns and severe sediment accumulation, rendering its original purpose of water storage and flood control obsolete.
This aging dam poses a significant threat, classified as in poor condition with an "extremely high" downstream hazard. Its presence also completely blocks the migration of endangered Southern California steelhead, severely impacting their dwindling population. Over 15 miles of upstream habitat remain inaccessible to these fish.
The dam's sediment buildup has also contributed to coastal erosion by trapping approximately 9 million cubic yards of sand that would naturally reach Ventura's beaches. The removal project includes essential infrastructure upgrades, such as replacing downstream bridges and modifying levees to prepare for the Ventura River's natural flow.
With over $44 million secured for planning and construction since 2017, Ventura County aims for sediment release preparation by 2030. Full demolition and site restoration are projected for the mid-2030s, marking a critical step in ecological restoration and community safety.
