Glendale Narrows remains the only major segment of the 51-mile-long L.A. River flood control system that was not designed to contain a 100-year flood.
Heavy rain this week turned the Los Angeles River flood-control channel into a raging torrent, and with new storms expected on Monday, emergency officials are keeping a wary eye on a well-known stretch that has long been vulnerable to flooding.is a lush seven-mile section of rumbling runoff between Griffith Park and downtown that attracts numerous sightseers and bicyclists. But despite its Instagram appeal, the narrows is a flood manager’s nightmare.
Although it is “armored” with flood barriers installed by the Army Corps to protect surrounding neighborhoods, industrial areas and freeways, major downpours still spark concern among county flood managers.Flood-control dams above the communities of Arcadia, Sierra Madre, Pacoima, Sun Valley and Sunland face risk of overflowing, officials say.
In the meantime, Pestrella said, his agency routinely compensates for hydraulic deficiencies in the area by “restraining flows” of stormwater released from the county’s Big Tujunga and Pacoima dams perched in the southern flanks of the San Gabriel Mountains. “I’m personally concerned about this because our levee systems are very, very old and basically made out of soil,” said Amir AghaKouchak, a UC Irvine professor. AghaKouchak co-authored a 2020 study on theon levees protecting critical infrastructure–transmission lines, roads, railroads, natural gas and petroleum pipelines in densely populated areas such as Southern California’s coastal communities.
Communities at highest risk include Carson, Compton, Bell Gardens, South Gate, North Long Beach and portions of downtown Long Beach, including the southern end of Pine Street near the Long Beach Convention Center. Forecasts of new storms to come have focused attention on the condition of earthen embankments guarding a segment of Compton Creek near the 91 Freeway, as well as a stretch of the L.A. River farther south in Long Beach.
Army Corps levee safety officers rated the systems to be “minimally acceptable” after determining that the deficiencies would not prevent them from performing as intended during the next significant runoff event.As record snows saddle the eastern Sierra Nevada, snowmelt threatens to inundate Los Angeles Department of Water and Power infrastructure.
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