Graham Sexstone


Graham Sexstone is a Research Hydrologist with the U.S. Geological Survey who researches the quality and availability of water resources in the western mountains of the United States through field measurements and modeling. His research focuses on seasonal snow hydrology and the importance of snow processes to water budgets, water availability, and water quality in the West.



Ph.D., Watershed Science, Colorado State University, 2016

M.S., Watershed Science, Colorado State Univeristy, 2012

B.A., Geography, University of Vermont, 2007



[11] Sexstone, G. A., Clow, D. W., Fassnacht, S. R., Liston, G. E., Hiemstra, C. A., Knowles, J. F., and Penn, C. A., 2018, Snow sublimation in mountain environments and its sensitivity to forest disturbance and climate warming: Water Resources Research, v. 54, p. 1191–1211,

[10] Sexstone, G.A., Clow, D.W., and Penn, C.A., 2018, SnowModel simulations and supporting observations for the north-central Colorado Rocky Mountains during water years 2011 through 2015: U.S. Geological Survey data release,

[9] Sexstone, G.A. 2016. Snow sublimation and seasonal snowpack variability, Ph.D. Dissertation, Colorado State University, Fort Collins, CO,

[8] Sexstone, G.A., Clow, D.W., Stannard, D.I., and Fassnacht, S.R., 2016, Comparison of methods for quantifying surface sublimation over seasonally snow-covered terrain: Hydrological Processes, v. 30, no. 19, p. 3373-3389,

[7] Mast, M.A., Murphy, S.F., Clow, D.W., Penn, C.A., and Sexstone, G.A., 2016, Water-quality response to a high-elevation wildfire in the Colorado Front Range: Hydrological Processes, v. 30, no. 12, p. 1811-1823,

[6] Fassnacht, S.R., Sexstone, G.A., Kashipazha, A.H., Lopez-Moreno, J.I., Jasinski, M.F., Kampf, S.K., and Von Thaden, B.C., 2016, Deriving snow-cover depletion curves for different spatial scales from remote sensing and snow telemetry data: Hydrological Processes, v. 30, no. 11, p. 1708-1717,

[5] Bruce, B.W., Clow, D.W., Maupin, M.A., Miller, M.P., Senay, G.B., Sexstone, G.A., and Susong, D.D., 2015, U.S. Geological Survey National Water Census: Colorado River Basin Geographic Focus Area Study: U.S. Geological Survey Fact Sheet 2015-3080,

[4] Clow, D.W., Roop, H.A., Nanus, L., Fenn, M.E., and Sexstone, G.A., 2015, Spatial patterns of atmospheric deposition of nitrogen and sulfur using ion-exchange resin collectors in Rocky Mountain National Park, USA: Atmospheric Environment, v. 101, p. 149-157,

[3] López-Moreno, J.I., Revuelto, J., Fassnacht, S.R., Azorín-Molina, C., Vicente-Serrano, S.M., Morán-Tejeda, E., and Sexstone, G.A., 2015, Snowpack variability across various spatio-temporal resolutions: Hydrological Processes, v. 29, no. 6, p. 1213-1224,

[2] Sexstone, G.A., and Fassnacht, S.R., 2014, What drives basin scale spatial variability of snowpack properties in northern Colorado?: The Cryosphere, v. 8, no. 2, p. 329-344,

[1] Sexstone, G.A., 2012, Evaluating the spatial variability of snowpack properties across a northern Colorado basin, M.S. Thesis, Colorado State University, Fort Collins, Colorado,