Castle Lake smokey (IMAGE) University of California - Davis Caption Castle Lake in Siskiyou County covered in wildfire smoke. A UC Davis study shows wildfire smoke in recent years drifted across the continent, touching nearly every lake in North America. Credit Erin Suenaga, UNR Usage Restrictions Credit must be given to the creator. Only noncommercial uses of the work are permitted. No derivatives or adaptations of the work are permitted. License CC BY-NC-ND 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.