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Title: Los Angeles County Drainage Area, Whittier Narrows Dam Safety Modification Project : Design Changes # 1 – Raise Rosemead Boulevard, Raise and Realign Lincoln Avenue, Cross Six Waterways, and Designate Santa Fe Dam Reservoir as Project Borrow Area : Final Supplemental Environmental Assessment
Authors: United States. Army. Corps of Engineers. Los Angeles District
Keywords: Flood control
Hydraulic structures
Environmental management
Environmental protection
Whittier Narrows Dam (Calif.)
Santa Fe Dam (Calif.)
San Gabriel River (Calif.)
Los Angeles County (Calif.)
Publisher: United States. Army. Corps of Engineers. Los Angeles District
Abstract: The U.S. Army Corps of Engineers (USACE) has prepared this Final Supplemental Environmental Assessment (SEA) to evaluate potential impacts of proposed design changes to the Whittier Narrows Dam Safety Modification Project (Project). The Project was previously evaluated in a Final Environmental Impact Statement (FEIS) prepared in May 2019 (USACE, 2019), where USACE analyzed an array of alternative risk management plans (RMPs) to reduce the potential for consequences of catastrophic flooding resulting from potential failure of the Whittier Narrows Dam during rare to extremely rare flood events. Through this evaluation process, Risk Management Plan (RMP) 5 (Protected Overtopping with Seepage Control) was selected as the USACE preferred alternative for the Project. Since this time, a number of modifications proposed to the Project have required that this SEA be prepared to evaluate the impacts of these additional modifications on the natural and human environment. The alternatives evaluated in this SEA include the previously approved Project (RMP 5) from the FEIS (without modification) and the current Proposed Project (the modified Project). For the purposes of this SEA, this is the “No Federal Action” and the “Proposed Federal Action,” respectively.
Description: Supplemental Environmental Assessment and Finding of No Significant Impact
Rights: Approved for Public Release; Distribution is Unlimited
Appears in Collections:Environmental Documents