Patrick C Longley
Patrick is a Hydrologist with the USGS Colorado Water Science Center, Western Colorado Office, in Grand Junction, CO.
Patrick is interested in studying how snowpack dynamics and changing climate affect water availability and water quality at a variety of scales.
Professional Experience
Hydrologist, USGS-Colorado Water Science Center, Grand Junction, CO, 2022-present
Physical Scientist, USGS-Utah Water Science Center, Salt Lake City, UT, 2020-2022
Water Rights Specialist, Utah Division of Water Rights, Salt Lake City, UT, 2019-2020
Hydrologic Technician, National Park Service, Yosemite, CA, 2018
Research Assistant, Nevada Mountain Ecohydrology Lab, Reno, NV, 2015-2017
Education and Certifications
Masters of Science in Hydrology, the University of Nevada Reno, Reno, NV, 2017
Focus: Quantifying the effects of changing snowpack dynamics on hydrologic partitioning at multiple scalesBachelor of Science in Mathematics, Western Washington University, Bellingham, WA, 2014
Science and Products
Daily baseflow specific conductance, daily baseflow discharge, and seasonal baseflow discharge and baseflow dissolved solids loads at selected sites within the Colorado River Basin for water years 1980 – 2022
This data release contains three sets of estimated values at selected sites within the Colorado River Basin: 1) daily specific conductance at 143 sites in the Upper Basin and 3 sites in the Lower Basin (WY 1980-2022); 2) daily baseflow discharge at 100 sites in the Upper Basin and 3 sites in the Lower Basin (WY 1980-2022); and 3) seasonal baseflow discharge and baseflow dissolved solids load at 14
Erosion rates and salinity and selenium yields in a basin near Rangely, Colorado following the 2017 Dead Dog wildfire as modeled by WEPP and measured from UAV
This data release accompanies a U.S Geological Survey study that assessed sediment, salinity, and selenium yields following the Dead Dog wildfire in northwestern Colorado. The Dead Dog fire ignited on June 11, 2017, near Rangely, Colorado, and burned over 17,000 acres, including the B2 study area. Two methodologies were used to quantify erosion and associated salinity and sediment yields in the B2
Digital hydrogeologic framework model of the Upper Colorado River Basin, western U.S.
This digital dataset was created as part of a U.S. Geological Survey hydrologic resource assessment and development of an integrated numerical hydrologic model of the hydrologic system of the Upper Colorado River Basin, an extensive region covering approximately 412,000 square kilometers in five states: Wyoming, Colorado, Utah, Arizona, and New Mexico. As part of this larger study, the USGS develo
Hydrogen and oxygen stable isotope mass balance evaluation of the National Water Model (v2.1) streamflow, runoff and groundwater flows
This data release contains the results of an isotopic mass balance approach to provide an estimate of the long-term average isotope ratios of NWM streamflow for the summer season (JJA) between 2000 and 2019 in the Western United States. The NWM-estimated long-term average isotope ratios are compared directly to 6426 stream stable isotope observations in 995 unique catchments. Quantified similariti
SPARROW model inputs and simulated future baseflow for streams of the Upper Colorado River Basin
The U.S. Geological Survey's (USGS) SPAtially Referenced Regression On Watershed attributes (SPARROW) model was used to estimate baseflow changes from historical (1984 - 2012) to thirty-year periods centered around 2030, 2050, and 2080 under warm/wet, median, and hot/dry climatic conditions. SPARROW is a spatially explicit hybrid statistical and process-based model that estimates mean baseflow ove
Assessing exposure of northern Utah communities to dust from the contaminated and dynamic Great Salt Lake playa
No abstract available.
Authors
Annie L. Putman, Molly Ann Blakowski, Morgan C. McDonnell, Destry N DiViesti, Diego P. Fernandez, Patrick Cullen Longley, Daniel Jones
A review of current capabilities and science gaps in water supply data, modeling, and trends for water availability assessments in the Upper Colorado River Basin
The Colorado River is a critical water resource in the southwestern United States, supplying drinking water for 40 million people in the region and water for irrigation of 2.2 million hectares of land. Extended drought in the Upper Colorado River Basin (UCOL) and the prospect of a warmer climate in the future pose water availability challenges for those charged with managing the river. Limited wat
Authors
Fred D. Tillman, Natalie K. Day, Matthew P. Miller, Olivia L. Miller, Christine Rumsey, Daniel Wise, Patrick Cullen Longley, Morgan C. McDonnell
How will baseflow respond to climate change in the Upper Colorado River Basin?
Baseflow is critical to sustaining streamflow in the Upper Colorado River Basin. Therefore, effective water resources management requires estimates of baseflow response to climatic changes. This study provides the first estimates of projected baseflow changes from historical (1984 – 2012) to thirty-year periods centered around 2030, 2050, and 2080 under warm/wet, median, and hot/dry climatic condi
Authors
Olivia L. Miller, Matthew P. Miller, Patrick Cullen Longley, Jay R. Alder, Lindsay A. Bearup, Tom Pruitt, Daniel Jones, Annie L. Putman, Christine Rumsey, Tim S. McKinney
Non-USGS Publications**
Tillman, Fred D, Natalie K. Day, Matthew P. Miller, Olivia L. Miller, Christine A. Rumsey, Daniel R. Wise, Patrick C. Longley, and Morgan C. McDonnell. 2022. "A Review of Current Capabilities and Science Gaps in Water Supply Data, Modeling, and Trends for Water Availability Assessments in the Upper Colorado River Basin" Water 14, no. 23: 3813. https://doi.org/10.3390/w14233813
Olivia L. Miller; Matthew P. Miller; Patrick C. Longley; Jay R. Alder; Lindsay A. Bearup; Tom Pruitt; Daniel K. Jones; Annie L. Putman; Christine A. Rumsey; Tim McKinney. 2021. "How Will Baseflow Respond to Climate Change in the Upper Colorado River Basin?" Geophysical Research Letters, Volume 48, Issue 22. https://doi.org/10.1029/2021GL095085
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.
Science and Products
- Data
Daily baseflow specific conductance, daily baseflow discharge, and seasonal baseflow discharge and baseflow dissolved solids loads at selected sites within the Colorado River Basin for water years 1980 – 2022
This data release contains three sets of estimated values at selected sites within the Colorado River Basin: 1) daily specific conductance at 143 sites in the Upper Basin and 3 sites in the Lower Basin (WY 1980-2022); 2) daily baseflow discharge at 100 sites in the Upper Basin and 3 sites in the Lower Basin (WY 1980-2022); and 3) seasonal baseflow discharge and baseflow dissolved solids load at 14Erosion rates and salinity and selenium yields in a basin near Rangely, Colorado following the 2017 Dead Dog wildfire as modeled by WEPP and measured from UAV
This data release accompanies a U.S Geological Survey study that assessed sediment, salinity, and selenium yields following the Dead Dog wildfire in northwestern Colorado. The Dead Dog fire ignited on June 11, 2017, near Rangely, Colorado, and burned over 17,000 acres, including the B2 study area. Two methodologies were used to quantify erosion and associated salinity and sediment yields in the B2Digital hydrogeologic framework model of the Upper Colorado River Basin, western U.S.
This digital dataset was created as part of a U.S. Geological Survey hydrologic resource assessment and development of an integrated numerical hydrologic model of the hydrologic system of the Upper Colorado River Basin, an extensive region covering approximately 412,000 square kilometers in five states: Wyoming, Colorado, Utah, Arizona, and New Mexico. As part of this larger study, the USGS develoHydrogen and oxygen stable isotope mass balance evaluation of the National Water Model (v2.1) streamflow, runoff and groundwater flows
This data release contains the results of an isotopic mass balance approach to provide an estimate of the long-term average isotope ratios of NWM streamflow for the summer season (JJA) between 2000 and 2019 in the Western United States. The NWM-estimated long-term average isotope ratios are compared directly to 6426 stream stable isotope observations in 995 unique catchments. Quantified similaritiSPARROW model inputs and simulated future baseflow for streams of the Upper Colorado River Basin
The U.S. Geological Survey's (USGS) SPAtially Referenced Regression On Watershed attributes (SPARROW) model was used to estimate baseflow changes from historical (1984 - 2012) to thirty-year periods centered around 2030, 2050, and 2080 under warm/wet, median, and hot/dry climatic conditions. SPARROW is a spatially explicit hybrid statistical and process-based model that estimates mean baseflow ove - Publications
Assessing exposure of northern Utah communities to dust from the contaminated and dynamic Great Salt Lake playa
No abstract available.AuthorsAnnie L. Putman, Molly Ann Blakowski, Morgan C. McDonnell, Destry N DiViesti, Diego P. Fernandez, Patrick Cullen Longley, Daniel JonesA review of current capabilities and science gaps in water supply data, modeling, and trends for water availability assessments in the Upper Colorado River Basin
The Colorado River is a critical water resource in the southwestern United States, supplying drinking water for 40 million people in the region and water for irrigation of 2.2 million hectares of land. Extended drought in the Upper Colorado River Basin (UCOL) and the prospect of a warmer climate in the future pose water availability challenges for those charged with managing the river. Limited watAuthorsFred D. Tillman, Natalie K. Day, Matthew P. Miller, Olivia L. Miller, Christine Rumsey, Daniel Wise, Patrick Cullen Longley, Morgan C. McDonnellHow will baseflow respond to climate change in the Upper Colorado River Basin?
Baseflow is critical to sustaining streamflow in the Upper Colorado River Basin. Therefore, effective water resources management requires estimates of baseflow response to climatic changes. This study provides the first estimates of projected baseflow changes from historical (1984 – 2012) to thirty-year periods centered around 2030, 2050, and 2080 under warm/wet, median, and hot/dry climatic condiAuthorsOlivia L. Miller, Matthew P. Miller, Patrick Cullen Longley, Jay R. Alder, Lindsay A. Bearup, Tom Pruitt, Daniel Jones, Annie L. Putman, Christine Rumsey, Tim S. McKinneyNon-USGS Publications**
Tillman, Fred D, Natalie K. Day, Matthew P. Miller, Olivia L. Miller, Christine A. Rumsey, Daniel R. Wise, Patrick C. Longley, and Morgan C. McDonnell. 2022. "A Review of Current Capabilities and Science Gaps in Water Supply Data, Modeling, and Trends for Water Availability Assessments in the Upper Colorado River Basin" Water 14, no. 23: 3813. https://doi.org/10.3390/w14233813Olivia L. Miller; Matthew P. Miller; Patrick C. Longley; Jay R. Alder; Lindsay A. Bearup; Tom Pruitt; Daniel K. Jones; Annie L. Putman; Christine A. Rumsey; Tim McKinney. 2021. "How Will Baseflow Respond to Climate Change in the Upper Colorado River Basin?" Geophysical Research Letters, Volume 48, Issue 22. https://doi.org/10.1029/2021GL095085**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.