Burnout operations have increased the acreage burned by the Rhoades Canyon Fire east of Clarno to 14,000 acres, but containment has increased to 50 percent.  The Central Oregon Interagency Coordination Center said today that firefighters were continuing to construct fireline as well as hold and improve existing containment lines.  Increasing temperatures, low relative humidity, and afternoon winds that typically come through the area remained concerns.  The cause remains under investigation.  The fire is south of Highway 218 and east of the John Day River.  The river remains open and the Clarno boat launch is not affected, but boaters should be aware that helicopters may be using the river to dip buckets.  A pilot car is being used on Highway 218 when needed, with delays expected at less than 20 minutes.