Size of the Top of the World Fire on Forest Service land between Bingen and Lyle is now at an estimated 240 acres.  Columbia River Gorge National Scenic Area officials say firefighters on Monday were able to get a line around most of the fire perimeter, and were continuing to do so today under the rim nearest Catherine Creek.  Fire activity was moderated by cooler weather overnight.  The public is being asked to avoid the area surrounding the Coyote Wall and Catherine Creek trail systems.  Smoke will remain visible from Highway 14 and Interstate 84.  Firefighters responded on Monday afternoon to what was a prescribed burn to reduce hazardous fuels after strong winds arrived in the area.  NSA officials say no structures were threatened.