2020 Calwood Fire (IMAGE) University of Colorado at Boulder Caption A DC-10 drops fire retardant on the edge of the 2020 Calwood Fire in Colorado. Credit William Travis, University of Colorado Usage Restrictions None License Original 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.