The South Central Oregon Interagency Fire Management Partnership said Monday that the fire had burned 6 homes and another 14 structures.
Over 100 people were evacuated Sunday to the Sprague River Community Center.
Officials first spotted the Moccasin Hill wildfire at around 2 p.m. Sunday, burning about 75 acres of timber and brush on private land.
As of 8 p.m. Saturday the fire is about 600 acres northeast of Klamath Falls. By 1 a.m. Monday 2,900 acres had burned.
The Klamath County Sheriff's Office asked people living on Sprague River Drive and N. Arrowhead Lane to evacuate to a Red Cross shelter set up at the Sprague River Community Center.
Investigators are still looking into what caused the fire. Officials from the South Central Oregon Interagency Fire said their crews handled a half-dozen small fires started by lightning earlier on Sunday.