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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BFS—A non-linear, state-space model for baseflow separation and prediction
Streamflow in rivers can be separated into a relatively steady component, or baseflow, that represents reliably available surface water and more dynamic components of runoff that typically represent a large fraction of total streamflow. A spatially aggregated numerical time-series model was developed to separate the baseflow component of a streamflow time-series using a state-space framework in wh
Authors
Christopher P. Konrad
Ungulate migrations of the western United States, volume 3
Ungulates (hooved mammals) have a broad distribution across the western United States and play an important role in maintaining predator-prey dynamics, affecting vegetation communities, and providing economic benefits to regional communities through tourism and hunting. Throughout the diverse landscapes they occupy, many ungulate populations undertake seasonal migrations to exploit spatially and t
Authors
Matthew Kauffman, Blake Lowrey, Jodi Berg, Scott Bergen, Doug Brimeyer, Patrick Burke, Teal Cufaude, James W. Cain, Jeffrey Cole, Alyson Courtemanch, Michelle Cowardin, Julie Cunningham, Melia DeVivo, Jennifer Diamond, Orrin Duvuvuei, Julien Fattebert, Joanna R. Ennis, Darby Finley, Jessica Fort, Gary Fralick, Eric Freeman, Jeff Gagnon, Julie Garcia, Emily Gelzer, Morgan Graham, Jacob Gray, Evan Greenspan, L. Embere Hall, Curtis Hendricks, Andy Holland, Brian Holmes, Katey Huggler, Mark A. Hurley, Emily Jeffreys, Aran Johnson, Lee Knox, Kevin Krasnow, Zack Lockyer, Hannah Manninen, Mike McDonald, Jennifer L. McKee, James Meacham, Jerod Merkle, Barb Moore, Tony W. Mong, Clayton Nielsen, Brendan Oates, Kim Olsen, Daniel Olson, Lucas Olson, Matt Pieron, Jake Powell, Annemarie Prince, Kelly Proffitt, Craig Reddell, Corinna Riginos, Robert Ritson, Sierra Robatcek, Shane Roberts, Hall Sawyer, Cody Schroeder, Jessie Shapiro, Nova Simpson, Scott Sprague, Alethea Steingisser, Nicole Tatman, Benjamin Turnock, Cody F. Wallace, Laura Wolf
Analysis of groundwater and surface water in areas of isoxaflutole application, Tuscola and Kalamazoo Counties, Michigan
The herbicide 5-cyclopropyl-4-(2-methylsulfonyl-4-trifluoromethylbenzoyl) isoxazole, also known as isoxaflutole (IXF), was conditionally approved for use on corn in Michigan in 2015. The fate of IXF and its degradates in different environmental settings and the processes by which these compounds move to groundwater or to surface-water bodies have been previously studied, but little information abo
Authors
Carol L. Luukkonen, Mark E. Brigham
The National Cooperative Geologic Mapping Program’s U.S. GeoFramework Initiative — Delivering a digital database of geologic map information by 2030
The U.S. Geological Survey's National Cooperative Geologic Mapping Program's U.S. GeoFramework Initiative responds to Congressional direction to implement the National Geologic Map Database Phase Three. The U.S. GeoFramework Initiative aims to create and deliver a new digital geologic framework of the United States by 2030. This Fact Sheet outlines the collaborations needed and plans taken to achi
Authors
Jenna L. Shelton, William Andrews, Joseph Colgan, Samuel Johnstone, David R. Soller, Richard Berg, Donald S. Sweetkind, Kristine L. Zellman, John Brock, Kate Ritzel
U.S. Geological Survey science strategy for Arctic Alaska, fiscal years 2022–24
IntroductionThe United States is an Arctic nation because of Alaska and thus maintains tremendous interests and stewardship responsibilities in the region, especially as the region undergoes substantial environmental transformation. This Arctic Science Strategy is intended to support those interests and responsibilities by expressing the core values, mission, vision, and the broad research goals a
Authors
Dee M. Williams, Aimee Devaris
Precipitation-driven flood-inundation mapping of Muddy Creek at Harrisonville, Missouri
The U.S. Geological Survey, in cooperation with the city of Harrisonville, Missouri, assessed flooding of Muddy Creek resulting from varying precipitation magnitudes and durations, antecedent runoff conditions, and channel modifications (cleaned culverts and added detention storage). The precipitation scenarios were used to develop a library of flood-inundation maps that included a 3.8-mile reach
Authors
David C. Heimann, Paul H. Rydlund
Black Abalone surveys at Naval Base Ventura County, San Nicolas Island, California—2021, annual report
The U.S. Geological Survey monitors a suite of intertidal black abalone sites at San Nicolas Island, California, in cooperation with the U.S. Navy, which owns the island. The nine rocky intertidal sites were established in 1980 to study the potential effect of translocated sea otters on the intertidal black abalone population at the island. The sites were monitored from 1981 to 1997, usually annua
Authors
Michael C. Kenner, Julie L. Yee
Field application of carbon dioxide as a behavioral control method for invasive red swamp crayfish (Procambarus clarkii) in southeastern Michigan water retention ponds
This study evaluated carbon dioxide (CO2) injected into water as a possible behavioral stimulant to enhance capture and removal of invasive red swamp crayfish (RSC, Procambarus clarkii [Girard, 1852]) from a retention pond in southeastern Michigan. Objectives of this study were (1) to determine if target CO2 concentrations were attainable within the infested pond and (2) to determine if CO2 treatm
Authors
Justin Smerud, Jose Rivera, Todd Johnson, John Tix, Kim T. Fredricks, Matthew Barbour, Seth Herbst, Sara Thomas, Lucas Nathan, Brian Roth, Kelley Smith, Ann Allert, Jim Stoeckel, Aaron R. Cupp
State of the Regional Preserve System in western San Diego County
No abstract available.
Authors
Kristine L. Preston, Emily E. Perkins, Christopher W. Brown, Sarah Joelle McCutcheon, Annabelle E Bernabe, Emilie Luciani, Barbara E. Kus, Susan Wynn
Assessment of significant sand resources in Federal and California State Waters of the San Francisco, Oceanside, and Silver Strand littoral cell study areas along the continental shelf of California
Executive SummaryThe Sand Resources Project was established through collaborative agreements between the U.S. Geological Survey (USGS), the Bureau of Ocean Energy Management (BOEM), and the California Ocean Protection Council (OPC) with the purpose of evaluating sand and gravel resources in Federal and California State Waters for potential use in future beach-nourishment projects. Project partners
Authors
Jonathan A. Warrick, James E. Conrad, Antoinette Papesh, Tom Lorenson, Ray Sliter
Compilation of existing data for sand resource studies in Federal and California State Waters of the San Francisco, Oceanside, and Silver Strand littoral cell study areas along the continental shelf of California—Strategy for field studies and sand resour
Executive SummaryThe Sand Resources Project was established through collaborative agreements between the U.S. Geological Survey (USGS), the Bureau of Ocean Energy Management (BOEM), and the California Ocean Protection Council (OPC) with the purpose of evaluating sand and gravel resources in Federal and California State Waters for potential use in future beach-nourishment projects. Project partners
Authors
Jonathan A. Warrick, James E. Conrad, Antoinette Papesh, Tom Lorenson, Ray Sliter
Landsat Collection 2 Level-3 Burned Area science product
Accurate and complete data on fire locations and burned areas are needed to quantify trends and patterns of fire occurrence, characterize drivers of fire, project future fire pattern behavior, and help with assessments of fire effects on natural and social systems. The Landsat Collection 2 Level-3 Burned Area science product is designed to identify burned areas across all ecosystems (for example,