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PORTLAND-- Cooler temperatures over the weekend helped firefighters contain the dozen large fires burning across Oregon.

But the Northwest Interagency Coordination Center said Monday that more lightning with the potential to start more wildfires is in the forecast for northern central Oregon.

The largest wildfire burning in Oregon, the Buzzard Complex 45 miles northeast of Burns, reached almost 396,000 acres early Monday morning, roughly four times the area of the Portland city limits.

The fire was started by lightning July 14 and has been growing since then. The perimeter was about 75 percent contained by 8 a.m. Monday morning, according to the Bureau of Land Development.

The fire closed Highway 78 last week. The highway has been reopened, but heavy equipment remains on the roadway and drivers were urged to leave their lights on and use caution in the area. A temporary flight restriction was in place over the complex.

Scattered thunderstorms will be a mixed blessing this week, as rain may help with the existing fires, but lightning will be a concern outside of the complex, according to incident managers. Strong winds expected by mid-week could also challenge fire crews.

Click for the latest on the Buzzard Complex

Related: Buzzard Complex fire kills cattle, threatens ranches

The Pine Creek Complex, near John Day, reached 129,000 acres Sunday night. The largest fire of the complex, the Pine Creek Fire, was nearly 30,000 acres and only 15 percent contained.

A fire complex on the Warm Springs Indian Reservation, made up of the Shaniko Butte Fire, Logging Unit Fire and Bear Butte 2 Fire, was 50 percent contained at 42,500 acres Sunday night.

On Sunday, fire managers lifted the rafting closure on the Deschutes River near the complex.

The Waterman Complex on Ochoco National Forest land reached nearly 12,000 acres by Monday morning. Nearly 900 people were helping to fight the fire, which was last reported at 60 percent containment.

Residents of 37 homes near the community of Mitchell were allowed to return home after the danger from the Waterman Complex fires eased. But U.S. Highway 26 remained closed Monday at the Ochoco Summit east of Prineville.

Click for the latest on the Waterman Complex

Crews were also battling the Bridge 99 Complex in the Deschutes National Forest, which had grown to 5,310 acres by Monday morning and was only 20 percent contained.

Near Prineville, the Ochoco Complex was burning more than 6,300 acres by Monday morning. Percentage of containment was not available, but crews expected full containment within a week.

Click for the latest on the Ochoco Complex

The Sunflower Fire was burning 5,900 acres in the Umatilla National Forest Monday morning. Crews reported 35 percent containment.

The largest fire complex in Washington, the Carlton Complex, was only 2 percent contained Monday morning and was burning an are four times the size of Seattle.

More: Wash. fire now four times the size of Seattle

Interactive: National wildfire tracker

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