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County flood control officials detail emergency expansion at Sierra Madre Dam after post‑fire storm
Summary
Los Angeles County Flood Control officials told the Sierra Madre City Council the Sierra Madre Dam project deepened the basin, added an upstream debris barrier and replaced damaged spillway rails after the Eden fire and a Feb. 13 storm that deposited roughly 80,000 cubic yards of sediment. Officials said about 10,500 cubic yards have been removed so far and the project should wrap in early April.
Los Angeles County Flood Control engineers described the emergency sediment capture expansion at Sierra Madre Dam during the March 24 Sierra Madre City Council meeting, emphasizing that post‑fire flows and a single Feb. 13 storm deposited unusually large volumes of sediment that threatened downstream neighborhoods.
"That storm brought in over 80,000 cubic yards of sediment to Sierra Madre Dam in one day," said Scott Grigowski, principal engineer in the district’s storm water engineering division. He said sediment levels rose more than 60 feet during the peak event and caused a brief spillway flow.
Patrick Holland, area engineer for the Flood Control District, outlined the district’s work to increase basin capacity…
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