BWCWA watershed data (image) American Society of Agronomy Share Print E-Mail Caption Trent Wickman of the USDA Forest Service collects data in the Boundary Waters Canoe Wilderness Area in northern Minnesota. The Forest Service was concerned that wildfires would lead to increased levels of mercury in watersheds. Credit USDA Forest Service. Usage Restrictions Please use with story only. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.