The Columbia River Gorge National Scenic Area plans to conduct prescribed burning on Tracy Hill starting Wednesday, if weather conditions allow.  Fire officials say prescribed burns reduce excess fuel from building up and minimize the potential for large scale wildfires while improving the overall health and resiliency of ecosystems.  Smoke may be visible on Highway 14 and Interstate 84 at times during the burns.  When smoke is present, motorists should reduce speeds and turn on headlights.  In order to minimize impacts from smoke, management officials from Oregon and Washington determine burn dates based on weather conditions.  Once dates are confirmed, details will be posted on the Scenic Area’s Facebook page and Twitter feed.  Those with asthma can request to be on an advance call list by contacting the National Scenic Area office at 541-308-1700.