LOS ANGELES — 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.

Glendale Narrows is a lush 7-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.

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