Todd Gregory Caldwell, Ph.D.

Todd Caldwell is a hydrologist and soil scientist with the U.S. Geological Survey, Nevada Water Science Center. 


Todd Caldwell is a hydrologist with the U.S. Geological Survey in the Nevada Water Science Center. He specializes in field investigations and numerical modeling of unsaturated zone processes and remotely-sensed soil moisture. His research focuses on in situ soil moisture and evapotranspiration monitoring, near-surface geophysics, and scaling hydraulic properties of soils and sediments.


  • Ph.D., Hydrogeology, University of Nevada, Reno
  • M.S., Hydrogeology, University of Nevada, Reno
  • B.S., Earth and Planetary Sciences, University of New Mexico


  • 2019 - pres: Hydrologist, USGS Nevada Water Science Center
  • 2012 - 2019: Research Scientist, Bureau of Economic Geology, University of Texas at Austin
  • 2001 - 2012: Research Professor, Desert Research Institute, Reno, NV
  • 2000 - 2001: Hydrologist, Pacific Northwest National Lab, Richland, WA