Parker Dam, Lake Havasu (IMAGE) University of Colorado at Boulder Caption Parker Dam above Lake Havasu in Arizona is a good example of dams encroaching on waterways and enhancing the spread of invasive species, according to a new study led by the University of Colorado at Boulder. Credit Pieter Johnson, University of Colorado 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.