Updated 9:55 p.m.

A wildland fire that's cropped up in north-central Oregon about 15 miles south of The Dalles has prompted evacuations and burned structures, while another blaze across the Columbia River now covers 14,175 acres.

The Oregon blaze, known as the South Valley fire, is estimated to be about 10,000 acres, Oregon Department of Forestry's Christie Shaw said. Authorities know lightning didn't start the blaze, she said, so it was likely human-caused.

The exact cause remains under investigation, said Shaw, an agency spokeswoman in central Oregon. Governor Kate Brown Wednesday evening declared the blaze a conflagration, allowing the state fire marshal to order statewide firefighters and equipment to be used to assist in battling the fire.

The fire, which is being pushed by wind, has prompted level 3 ("go") evacuations, and KATU-TV reports structures have burned.

Structure on fire near Dufur, Oregon BREAKING: Structure seen burning in the South Valley Fire near Dufur, Oregon. Several areas are under a LEVEL 3 (GO) evacuation order. Details: https://bit.ly/2vn8zuu Posted by KATU News on Wednesday, August 1, 2018

A section of U.S. 197 is also closed south of Dufur, according to TripCheck. The latest evacuation information can be found on the Wasco County Sheriff's Office's Facebook page.

Shaw said the fire started southwest of Dufur and was called in about 1:30 p.m. Wednesday. It's burning in and amongst homes, she said, and some local firefighters are working to protect structures.

Shaw said winds are pushing the fire to the east and that the blaze has crossed U.S. 197 and is burning on the east side of the highway. Airplanes, helicopters and ground resources are being used to fight the fire, she said.

Command will be transferred to the state fire marshal's office and an Oregon Department of Forestry incident management team Thursday, Shaw said.

The Washington blaze broke out Tuesday along State Route 14 west of Wishram around 4:30 p.m., according to the U.S. Forest Service. The so-called Milepost 90 fire then quickly spread across private, Forest Service and Bureau of Indian Affairs land, officials said.

There have been no reports of damaged homes or structures in that fire thus far. And all evacuation notices had been downgraded by early Wednesday afternoon, according to Klickitat County authorities. No areas were under level 3 evacuation notices at that point, but some were under level 2 ("get set") notices.

The latest evacuation information can be found here.

SR-14 remained closed Wednesday evening between U.S. 97 and U.S. 197, a stretch that extends roughly 20 miles.

Officials said the Milepost 90 fire was 60 percent contained. Its cause remains under investigation. The Red Cross has set up a shelter at Goldendale High School, the Klickitat County Sheriff's Office has said.

-- Jim Ryan

Shane Dixon Kavanaugh of The Oregonian/OregonLive staff contributed to this report