Rapid Creek, S.D. (IMAGE) U.S. National Science Foundation Caption Didymo is present at many points along Rapid Creek, S.D., and in pristine streams and rivers worldwide. Credit P. V. Sundareshwar Usage Restrictions None 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.