PORTLAND -- Crews are working to repair a water main burst in the 2900 block of Northeast 92nd Avenue.
The 8-inch cast iron pipe burst at around noon on Monday, according to Portland Water Bureau spokesman Tim Hall. Just after 12:30 p.m., crews arrived and began shutting down the water in the area.
“Portland’s cast iron water mains tend to break during colder times of the year," Hall said. "Colder water makes pipes more brittle, air temperature at or below freezing causes the ground around the pipe to freeze, increasing external pressure on the pipe."
He said temperature is just one of the factors, Others include soil type, nearby road maintenance and traffic.
"Out of the more than 2,100 miles of water pipe, there remain about 1,300 miles of cast iron pipe in the city’s system," Hall said. "We replace about five miles a year with ductile iron pipe, which is much more durable pipe."
Between 25 and 30 homes were affected. No flood damage was reported.
Repair work was expected to take about eight hours.