 Northwest News Radio. No word yet on the cause of the fires. A wildfire burning well over a month near Chelan, now over 15,000 acres in size. As of yesterday, the State Department of Natural Resources reports the Pioneer Fire is only 14% contained. Smoke from the Pioneer Fire began drifting west to the Cascade foothills of western Washington over the weekend, prompting air quality officials to warn those with health issues to stay indoors. It's now 7-10.