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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Potential risks of vegetation treatments to introduce and increase invasive annual grasses in rangelands of Montana, North Dakota, and South Dakota—A science synthesis to inform National Environmental Policy Act analyses Potential risks of vegetation treatments to introduce and increase invasive annual grasses in rangelands of Montana, North Dakota, and South Dakota—A science synthesis to inform National Environmental Policy Act analyses
The U.S. Geological Survey is working with Federal land management agencies to develop a series of planned structured science syntheses to support environmental effects analyses that agencies conduct under the National Environmental Policy Act (NEPA). This report synthesizes science information relevant to environmental effects analyses concerned with potential increases in the...
Authors
Aaron N. Johnston, David J. A. Wood, Kyle Ebenhoch, Tait K. Rutherford, Logan M. Maxwell, Sarah K. Carter
Proceedings of the Deepwater Hydrate Coring Expedition UT-GOM2-2 Proceedings of the Deepwater Hydrate Coring Expedition UT-GOM2-2
This report was the result of a scientific collaboration between the following institutions The University of Texas at Austin (UT), DOE, NETL, the United States Geological Survey (USGS), the Bureau of Ocean Energy Management (BOEM), The Ohio State University, Columbia University, University of New Hampshire, Oregon State University, University of Washington, Tufts University, Colorado...
Authors
Peter Flemings, Carla Thomas, Stephen C. Phillips, Timothy Collett, Ann E. Cook, Evan Solomon, Frederick S. Colwell, Joel E. Johnson, David Awwiller, Irita Aylward, Athma Bhandari, Donald Brooks, Jessica Z. Buser-Young, Alejandro Cardona, Michael Casso, Rachel Coyte, Tom Darrah, Marcy Davis, Brandon Dugan, Dan Duncan, John T. Germaine, Melanie Holland, Jesse Houghton, Saffron Martin, N. Tanner Mills, Michael Mimitz, Daniel Minarich, Yuki Morono, Zachary Murphy, Joshua O’Connell, Ethan Petrou, Tom Pettigrew, John W. Pohlman, Alexey Portnov, Marcie Purkey Phillips, Thomas Redd, Derek E. Sawyer, Peter Schultheiss, Kelly Shannon, Cathal Small, Camille Sullivan, Kayla Tozier, Man-Yin Tsang, Camila Van Der Maal, William F. Waite, Taylor Walton
Rebuilding a volcano one lava flow at a time—Visualizing the lava dome-building eruption in the crater of Mount St. Helens, 1982–1986 Rebuilding a volcano one lava flow at a time—Visualizing the lava dome-building eruption in the crater of Mount St. Helens, 1982–1986
Between 1980 and 1986, the U.S. Geological Survey made a series of 1:2,000-scale topographic contour maps from aerial photographic surveys to monitor the eruption. These maps were made for operational purposes and were not intended for publication. Since then, advances in technology made it possible to digitize the original, highly detailed hardcopy maps and derive new digital data...
Authors
Joseph A. Bard, Christina M. Friedle, Lorie Bartee, Brett C. Dierker, Joseph M. Ganick, Nichola M. Gregory, Kenton R. Hill, Jude G. Klug, Aerial Kruger, Dawson T. Mooney, Reun T. Morrison, Isa I. Rojas, Phil Rollo, Shawn A. Stanton, Bre Stewart, Blair E. Stuhlmuller, Adam D. Zyla
Computing discharge using the entropy-based probability concept Computing discharge using the entropy-based probability concept
This report describes the techniques and methods for computing the mean-channel velocity and discharge using the entropy-based probability concept (probability concept). The method is an alternative to or augments standard streamgaging methods adopted by the U.S. Geological Survey (USGS). Although sensor technology for measuring the mean velocity and discharge has advanced, standard...
Authors
John W, Fulton, Frank L. Engel, Jack R. Eggleston, Chao-Lin Chiu
Regional hydraulic geometry characteristics of stream channels in the Boston Mountains in Arkansas Regional hydraulic geometry characteristics of stream channels in the Boston Mountains in Arkansas
Many stream-channel infrastructure, habitat enhancement, and restoration projects are undertaken on streams throughout Arkansas by Federal, State, and local agencies as well as by private organizations and businesses with limited data on local geomorphology and streamflow conditions. Equations that relate drainage area above stable stream reaches to the basin characteristics, bankfull...
Authors
Daniel E. Kroes, Laura Suzanne Ruhl-Whittle, Allegra C. Pieri, Aaron L. Pugh
Multidecadal change in pesticide concentrations relative to human health benchmarks in the Nation’s groundwater Multidecadal change in pesticide concentrations relative to human health benchmarks in the Nation’s groundwater
Groundwater-quality trend assessments identify aquifers that are responding to changes in pesticide use and the compounds that may pose a threat to water availability. The U.S. Geological Survey has been monitoring pesticide concentrations in groundwater for 25 principal aquifers across the conterminous United States since 1993. The groundwater well locations represent a range of soils...
Authors
Sarah M. Stackpoole, Bruce D. Lindsey, Cee S. Nell
Bathymetric and acoustic-backscatter mapping of Lake Sammamish, Washington, during USGS field activity 2021-656-FA Bathymetric and acoustic-backscatter mapping of Lake Sammamish, Washington, during USGS field activity 2021-656-FA
In 2021, scientists from the U.S. Geological Survey (USGS) acquired bathymetric and acoustic-backscatter data within Lake Sammamish, Washington. Mapping was completed to find evidence of past earthquakes such as underwater landslides and is part of a larger USGS project to understand the overall geologic hazards history of the Cascadia Margin region. The survey was conducted using the...
Authors
Peter Dartnell, Daniel S. Brothers, Brian L. Sherrod, Gerry A. Hatcher, Daniel C. Powers, Jenna C. Hill, Jackson E. Currie, Peter Dal Ferro
The National Map Corps—Federal Emergency Management Agency and Oak Ridge National Laboratory pilot project report The National Map Corps—Federal Emergency Management Agency and Oak Ridge National Laboratory pilot project report
This report provides an overview of the U.S. Geological Survey National Map Corps —Federal Emergency Management Agency and Oak Ridge National Laboratory pilot project in St. James Parish, Louisiana, that began in February 2024 and ended at the end of March 2024. The project used the power of The National Map Corps’ volunteer community to improve building classifications in the original...
Authors
Tatyana Dimascio, Greg D. Matthews, Erin M. Korris
Assessment of undiscovered conventional oil and gas resources of Yemen, 2024 Assessment of undiscovered conventional oil and gas resources of Yemen, 2024
Using a geology-based assessment methodology, the U.S. Geological Survey estimated undiscovered, technically recoverable mean conventional resources of 261 million barrels of oil and 4.5 trillion cubic feet of gas in Yemen.
Authors
Christopher J. Schenk, Tracey J. Mercier, Phuong A. Le, Andrea D. Cicero, Sarah E. Gelman, Jane S. Hearon, Benjamin G. Johnson, Jenny H. Lagesse, Heidi M. Leathers-Miller
Flood-Inundation Maps of the Current and Jacks Fork Rivers including the Ozark National Scenic Riverways, Southeast Missouri, 2023 Flood-Inundation Maps of the Current and Jacks Fork Rivers including the Ozark National Scenic Riverways, Southeast Missouri, 2023
Digital flood-inundation maps for a 131.8-mile reach of the Current River and a 44.6-mile reach of the Jacks Fork River, in southeast Missouri, were created by the U.S. Geological Survey (USGS) in cooperation with the Ozark Foothills Regional Planning Commission and the South Central Ozark Council of Governments. The maps also encompass the 134 miles of the Current and Jacks Fork Rivers...
Authors
David C. Heimann, Jason L. High, Allison A. Atkinson, Paul H. Rydlund
ShakeAlert®—Communication, education, outreach and technical engagement strategic vision ShakeAlert®—Communication, education, outreach and technical engagement strategic vision
Executive Summary In 2006, the U.S. Geological Survey (USGS) began directly supporting ShakeAlert® research and in 2012 the ShakeAlert demonstration system began testing (Given and others, 2018). The ShakeAlert earthquake early warning (EEW) system is a partnership between the U.S. Geological Survey (USGS) and the three West Coast States (Washington, Oregon, and California) served by the
Authors
Robert Michael deGroot, Sara K. McBride, Margaret J. Vinci, Gabriel C. Lotto, Megan L. Anderson, Danielle F. Sumy, Brian Terbush
Flood-inundation maps for Río de la Plata in and near Comerío, Puerto Rico, 2025 Flood-inundation maps for Río de la Plata in and near Comerío, Puerto Rico, 2025
Digital flood-inundation maps for a 3.1-mile reach of Río de la Plata in and near Comerío, Puerto Rico, were created by the U.S. Geological Survey (USGS). Water-surface profiles were computed for the stream reach by using a one-dimensional steady-state step-backwater model. The model was calibrated to the current (2025) stage-streamflow relation (rating curve 11.0) for the USGS...
Authors
Chad J. Ostheimer, Legna M. Torres-Garcia