LOS ANGELES (AP) — Authorities have shut off all the valves on a large water line that broke early Wednesday in Los Angeles and flooded residential streets in the Mission Hills area of the San Fernando Valley.

The rupture occurred before dawn in a 72-inch-diameter (183-centimeter) trunk line, a major artery in the distribution system that delivers water between tanks and reservoirs to smaller water mains, the city Department of Water and Power said.

Crews slowly shut off 16 valves to prevent further damage to the line and to restore water pressure, allowing crews to prepare the site to be excavated for repair work, the DWP said.

The break flooded a street but no major damage was reported.

The line was installed in 1914.