Updated at 6:15 p.m.

A wildfire burning south of The Dalles has torched nearly 17,000 acres of land and has crossed the Deschutes River, fire officials say.

The Long Hollow fire crossed the river near Jones Canyon as of 5:45 p.m, according to the Central Oregon Fire Management Service. Wasco County residents, mostly between Sherars Falls to Mack's Canyon along the Deschutes River, are under a Level 3 immediate evacuation order issued by the sheriff's office. The department's Facebook page also announced closures at Long Hollow Road and Easton Canyon Road.

No evacuations have been ordered in nearby Sherman County as of 6 p.m.

The blaze near Dufur was originally reported Thursday at a little more than 6,000 acres but grew 9,000 more acres by 2 a.m. Friday, the service said. High temperatures and winds Friday afternoon caused it to spread farther.

More than 100 people will help fight the fire with local and federal resources, although there are no containment numbers yet. The efforts will be concentrated on dropping water and retardant, which the Fire Management Service said is the best method to suppress fire in grassy terrain.

As fire conditions change, the office will update its Facebook page with more information.

The Oregon Department of Transportation also is updating its website with road closures.

Structural damage has been reported on social media, but an official assessment will not come out until later Friday. Investigators will also try to pinpoint the cause of the fire.

Last week, the 70,000-acre Substation fire consumed much of the nearby area, causing one death and destruction to wheat farms.

-- Lydia Gerike

lgerike@oregonian.com

@LydiaGerike