A quick response from the air and on the ground was instrumental in stopping the forward progression of a wildfire originating in the southwest area of The Dalles Tuesday afternoon.  Columbia River Gorge National Scenic Area Public Affairs Officer Karen Davis says fire managers reported the size of the Chenowith Rim Fire at approximately 50 acres.  She added Oregon Department of Natural Resources Fire Boss aircraft were instrumental in knocking down the fire’s activity.  Crews continued to construct containment line, and were to mop up and monitor the fire until it is fully suppressed.  The Chenowith Rim Fire reportedly started on private land at approximately 4:20 p.m. and burned primarily in steep terrain on U.S. Forest Service lands.  The response is being managed under unified command between the U.S. Forest Service and Mid-Columbia Fire & Rescue.  The cause of the fire is unknown currently and is under investigation.