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Orange County Lake Empties for Crucial Dam Work
20 Oct
Summary
- Irvine Lake will be empty for five years for dam safety repairs.
- Repairs address structural weaknesses and increase water storage capacity.
- Fish relocation plans are being developed due to environmental concerns.
Irvine Lake, Orange County's largest freshwater lake, is beginning a gradual five-year drawdown this month. The reservoir, created in 1933, will be emptied to allow for major safety repairs to the 93-year-old Santiago Creek Dam. The project aims to reinforce aging infrastructure and enhance the dam's long-term water storage capabilities.
The California Division of Safety of Dams has classified the dam as having an "Extremely High" downstream hazard level. Key improvements include constructing a new concrete spillway, strengthening the earthen dam, and replacing the outlet tower. These upgrades are expected to restore the lake to its original design capacity of 28,000 acre-feet, enabling better rainwater capture.
The drawdown is also a proactive measure to prepare for winter storms, ensuring space for potential heavy rainfall and safeguarding downstream communities. Despite the necessary draining, local anglers are concerned about the lake's fish, particularly protected white sturgeon. The Irvine Ranch Water District is collaborating with state wildlife officials on relocation plans.
Public shoreline fishing is anticipated to resume approximately five years after construction is completed and the reservoir is refilled. The project emphasizes enhancing water supply resilience through improved storm management and increased water storage capacity.
