The Los Angeles County Board of Supervisors has granted approval for agreements aimed at facilitating the prompt implementation of the United States Army Corps of Engineers (Corps) Whittier Narrows Dam Safety Modification Project. This critical project is set to enhance the infrastructure of Los Angeles County in the project area, significantly improving flood control measures and ensuring the safety and resilience of downstream communities.
Constructed in 1957 by the Corps, Whittier Narrows Dam plays a vital role in the flood control system of Los Angeles County. Its primary purpose is to protect over 25 downstream communities from the potential devastation of catastrophic flooding. In addition to flood control, the dam supports stormwater capture for groundwater recharge and facilitates essential drainage, transportation, and recreational facilities.
In 2019, the Corps initiated the design of the Whittier Narrows Dam Safety Modification Project, which aims to enhance flood protection and increase the overall resiliency of downstream communities. The key focus of the project is to prevent erosion or failure of the earthen dam. This will be achieved through various measures, including raising and hardening the dam crest and improving embankment seepage control systems.
As part of the project, the roadway along the dam on Rosemead Boulevard will be reconstructed and raised by 6 feet. Additionally, a 78-inch County storm drain will be reinforced to enhance its capabilities. These infrastructure improvements are essential to support the overall objectives of the Whittier Narrows Dam Safety Modification Project.
Approval of the agreements by the Los Angeles County Board of Supervisors demonstrates their commitment to supporting the Corps in the timely award and implementation of a construction contract. Major construction activities for the project are expected to commence in 2025, with an anticipated completion date of 2029.
The approval of the agreements by the Los Angeles County Board of Supervisors is a significant step towards enhancing the safety and resilience of downstream communities through the Whittier Narrows Dam Safety Modification Project. The project’s focus on improving flood control measures and preventing potential dam failure will provide critical protection for millions of residents. With major construction activities set to begin in 2025, Los Angeles County is taking proactive measures to safeguard its infrastructure and ensure the well-being of its communities in the face of potential flood risks.
