The Oasis Fire was contained at 1,575 acres, according to Cal Fire's final report on the incident, issued Saturday evening.
Suppression costs are estimated at $3.5 million, Cal Fire reported.
The blaze broke out Monday evening in a wildland area stretching across a portion of Lake and Colusa counties.
It was located on Bureau of Land Management land in the Cache Creek Wilderness Area as well as wildlands in the Northshore Fire Protection District jurisdiction, south of Highway 20 and six miles west of Highway 16.
Cal Fire said the fire's cause remains under investigation.
During the week the number of personnel on scene topped out at more than 1,100, with Cal Fire, Northshore Fire, Williams Fire and Department of Corrections personnel on scene. Additional assistance came from the California Highway Patrol.
Remaining on scene Saturday were 153 personnel, with two engines, seven fire crews and two bulldozers, Cal Fire said.
Cal Fire reported approximately four injuries during the five-day blaze.
Officials said mop up and patrol of the fire area will continue.
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