Reports
Science Quality and Integrity
The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
Browse more than 82,000 reports authored by our scientists over the past 100+ year history of the USGS and refine search by topic, location, year, and advanced search.
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U.S. Geological Survey science strategy to address white-nose syndrome and bat health in 2025–2029 U.S. Geological Survey science strategy to address white-nose syndrome and bat health in 2025–2029
Since its discovery in 2006, the fungal disease known as white-nose syndrome (WNS) has killed millions of bats. Of the 47 bat species native to the conterminous United States, Alaska, Hawaii, and Canada, 12 have been affected by WNS, including 3 endangered species and 1 proposed endangered species. WNS has also been detected in 40 States and 9 Canadian Provinces. U.S. Geological Survey...
Authors
M. Camille Hopkins, Amy E. George, Rebecca M. McCaffery
Python Hyperspectral Analysis Tool (PyHAT) user guide Python Hyperspectral Analysis Tool (PyHAT) user guide
This report is a user guide for the 0.1.2 release of the Python Hyperspectral Analysis Tool (PyHAT) and its graphical user interface (GUI). The GUI is intended to provide an intuitive front end to allow users to apply sophisticated preprocessing and analysis methods to spectroscopic data. Though the PyHAT package has been developed with a particular focus on laser-induced breakdown...
Authors
Ryan B. Anderson, Itiya P. Aneece, Travis S.J. Gabriel
Revised marine bird collision and displacement vulnerability index for U.S. Pacific Outer Continental Shelf offshore wind energy development Revised marine bird collision and displacement vulnerability index for U.S. Pacific Outer Continental Shelf offshore wind energy development
The installation of offshore wind energy infrastructure (OWEI) at sea may affect marine birds by increasing the risk of mortality from collision with OWEI (Collision Vulnerability) and causing disturbance and displacement from important habitats (Displacement Vulnerability). In 2017, we published the first comprehensive database quantifying marine bird Collision Vulnerability and...
Authors
Emma C. Kelsey, Jonathan J. Felis, David M. Pereksta, Josh Adams
Collaborative drought science planning in the Colorado River Basin Collaborative drought science planning in the Colorado River Basin
The U.S. Geological Survey (USGS) is using collaborative, interdisciplinary planning to develop data and tools needed to optimize the management of water resources and land use by resource management agencies during an ongoing, multidecadal drought in the Colorado River Basin. The USGS Actionable and Strategic Integrated Science and Technology team works to build relationships with...
Authors
Patrick J. Anderson, Jeanne E. Godaire, Daniel K. Jones, William J. Andrews, Alicia A. Torregrosa, Meghan T. Bell, JoAnn M. Holloway, Molly A. Blakowski, Joseph A. Hevesi, Sharon L. Qi
Gravity and magnetic surveys of the Skaergaard intrusion, East Greenland Gravity and magnetic surveys of the Skaergaard intrusion, East Greenland
Aeromagnetic and gravity surveys of the Skaergaard intrusion in East Greenland were carried out in July–August 1971 as part of a grant to the University of Oregon Center for Volcanology to refine the models of crystallization and differentiation of the intrusion, specifically to test whether the intrusion is underlain by dense rocks of a reservoir 20 kilometers (km) thick (referred to as...
Authors
Mark E. Gettings
Assessment of undiscovered conventional oil and gas resources in Mexico, Belize, and Guatemala, 2024 Assessment of undiscovered conventional oil and gas resources in Mexico, Belize, and Guatemala, 2024
Using a geology-based assessment methodology, the U.S. Geological Survey estimated undiscovered, technically recoverable mean conventional resources of 14.6 billion barrels of oil and 83.7 trillion cubic feet of gas in Mexico, Belize, and Guatemala.
Authors
Christopher J. Schenk, Tracey J. Mercier, Phuong A. Le, Andrea D. Cicero, Ronald M. Drake II, Sarah E. Gelman, Jane S. Hearon, Benjamin G. Johnson, Jenny H. Lagesse, Heidi M. Leathers-Miller, Kira K. Timm
Potomac Tributary Summary: A summary of trends in tidal water quality and associated factors, 1985 - 2022 Potomac Tributary Summary: A summary of trends in tidal water quality and associated factors, 1985 - 2022
The Potomac Tributary Summary outlines change over time for a suite of monitored tidal water quality parameters and associated potential drivers of those trends for the period of 1985 to 2022, and provides a brief description of the current state of knowledge explaining these observed changes. Water quality parameters described include surface (above pycnocline) total nitrogen (TN)...
Authors
Breck Maura Sullivan, Kaylyn Gootman, Alex Gunnerson, Sarah Betts, Gabriel Duran, Cindy Johnson, Christopher A. Mason, Elgin Perry, Gopal Bhatt, Jennifer L. Keisman, James S. Webber, Jon Harcum, Michael Lane, Olivia Devereux, Qian Zhang, Rebecca Murphy, Renee Karrh, Thomas Butler, Zhaoying Wei
Tracking status and trends in seven key indicators of river and stream condition in the Chesapeake Bay watershed Tracking status and trends in seven key indicators of river and stream condition in the Chesapeake Bay watershed
Freshwater streams and rivers are recognized as vital habitats within the Chesapeake Bay watershed, which has been undergoing extensive restoration efforts for more than 30 years. Resource managers need to understand stream and river condition and how these conditions are changing over time to determine whether regional long-term restoration and conservation goals are being met. The...
Authors
Lindsey J. Boyle, Samuel H. Austin, Matthew J. Cashman, Zachary J. Clifton, John W. Clune, James E. Colgin, Kaitlyn E.M. Elliott, Rosemary M. Fanelli, Ellie P. Foss, Nathaniel P. Hitt, Elizabeth A. Hittle, Coral M. Howe, Emily H. Majcher, Kelly O. Maloney, Christopher A. Mason, Marina J. Metes, Douglas L. Moyer, Trevor P. Needham, Karli M. Rogers, Joshua J. Thompson, Guoxiang Yang, Tammy M. Zimmerman
Bison population dynamics, harvest, and human conflict potential under feedground management alternatives at the National Elk Refuge in Jackson, Wyoming Bison population dynamics, harvest, and human conflict potential under feedground management alternatives at the National Elk Refuge in Jackson, Wyoming
Bison bison were once abundant across North America but declined due to overharvesting in the late 1800s. The reintroduced population in and around Jackson, Wyoming has averaged 485 individuals between 2018–2023 and is the subject of a planning process to inform management strategies that will guide the U.S. Fish and Wildlife’s next “Bison and Elk Management Plan” for the National Elk...
Authors
Jonathan D. Cook, Margaret C. McEachran, Gavin G. Cotterill, Eric K. Cole
Decision analysis in support of the National Elk Refuge bison and elk management plan Decision analysis in support of the National Elk Refuge bison and elk management plan
Preface This report was developed to evaluate the performance of a set of proposed alternatives for Cervus elaphus canadensis (elk) and Bison bison (bison) management at the National Elk Refuge (NER) in Wyoming, U.S.A., and to inform a National Environmental Policy Act Environmental Impact Statement focused on developing the next “Bison and Elk Management Plan” (BEMP). The U.S...
Decision framing overview and performance of management alternatives for bison and elk feedground management at the National Elk Refuge in Jackson, Wyoming Decision framing overview and performance of management alternatives for bison and elk feedground management at the National Elk Refuge in Jackson, Wyoming
This report was developed to evaluate the performance of a set of proposed alternatives for Cervus elaphus canadensis (elk) and Bison bison (bison) management at the National Elk Refuge in Wyoming, U.S.A., and to inform a National Environmental Policy Act Environmental Impact Statement focused on developing the next “Bison and Elk Management Plan” (BEMP). The U.S. Geological Survey...
Authors
Jonathan D. Cook, Gavin G. Cotterill, Margaret C. McEachran, Tabitha A. Graves, Eric K. Cole, Paul C. Cross
Estimating the social and economic consequences of proposed management alternatives at the National Elk Refuge in Jackson, Wyoming Estimating the social and economic consequences of proposed management alternatives at the National Elk Refuge in Jackson, Wyoming
The National Elk Refuge (Refuge) is managed by the U.S. Fish and Wildlife Service and includes habitats for bison and elk. Bison and elk provide opportunities for wildlife-related recreation and contribute to the tourism industry in and around Jackson, Wyoming. Over the last century, the Refuge has provisioned supplemental feed to elk and, more recently, bison during winter months to...
Authors
Margaret C. McEachran, Andrew Don Carlos, Gavin G. Cotterill, Eric K. Cole, Jonathan D. Cook