Los Angeles Sunset Boulevard water main break (2015)
A 90-year-old, 12-inch cast-iron pipe burst on Sunset Boulevard, flooding the street and creating a sinkhole that swallowed part of a sidewalk. Crews worked for hours to stop the flow.
The break caused traffic chaos and $1.5 million in repairs.
It led Los Angeles to accelerate its pipe replacement program and spend more on leak detection.
Like OKC, the pipe was old and the failure was triggered by ground movement. It shows how a single break can cascade into costly repairs and force infrastructure investment.
