Daniel L Calhoun

Dan’s career with the USGS began in 1998, following graduate studies in Water Resources at the University of Georgia. His introduction to the agency, however, came earlier—while working as a Hydrologic Technician for the Jones Ecological Research Center, he was invited to assist USGS crews in the field, sparking a career that now spans almost three decades.

Over the years, Dan has contributed to and led a wide range of national and regional projects, including watershed and groundwater studies, contaminant assessments, amphibian research in the Southeast and across the US, and collaborative efforts with other federal agencies during disaster responses. He has also participated in multiple Regional Stream Quality Assessment (RSQA) studies and has authored or co-authored a broad range of scientific publications.

Dan’s work reflects a deep commitment to advancing the understanding of water quality, water availability, aquatic ecosystems, and hydrologic processes. His leadership continues to support the USGS mission of delivering unbiased, high-quality science to inform water management and environmental policy at federal, state, and local levels.