The fires broke out just after 4:30 P.M. They occurred off of Highway 97 and the Baker Road overpass and China Hat Road.
The Deschutes County Sheriff's Office says a motor home's faulty exhaust system triggered the fires. Apparently burning material from the exhaust was blown to the shoulder of the highway causing the fires.
Traffic was diverted off of northbound 97 for two hours.
The operator of the motor home fully cooperated with the investigation and no charges have been filed against him.