Graded Ski Run Abandoned (IMAGE) University of California - Davis Caption This graded ski run at Powder Bowl ski area in the Sierra Nevada mountains was abandoned 22 years prior, with little plant regrowth. Credit Jennifer Burt Usage Restrictions Provide credit. License Licensed content 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.