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.
Filter Total Items: 83829
Abundance and productivity of Marbled Murrelets (Brachyramphus marmoratus) off central California during the 2020 and 2021 breeding seasons
Marbled murrelets (Brachyramphus marmoratus) have been listed as “endangered” by the State of California and “threatened” by the U.S. Fish and Wildlife Service since 1992 in California, Oregon, and Washington. Information regarding marbled murrelet abundance, distribution, population trends, and habitat associations is critical for risk assessment, effective management, evaluation of conservation
Authors
Jonathan J. Felis, Josh Adams, Cheryl Horton, Emily C. Kelsey, Laney M. White
Assessment of well yield, dominant fractures, and groundwater recharge in Wake County, North Carolina
A cooperative study led by the U.S. Geological Survey and Wake County Environmental Services was initiated to characterize the fractured-rock aquifer system and assess the sustainability of groundwater resources in and around Wake County. This report contributes to the development of a comprehensive groundwater budget for the study area, thereby helping to enable resource managers to make sound an
Authors
Dominick J. Antolino, Laura N. Gurley
Summary of the midchannel springflows in Jackson River below Gathright Dam between April 24, 2010, and May 7, 2019
Between April 2010 and May 2019, springflow was determined for a midchannel spring
in Jackson River below Gathright Dam near Hot Springs, Virginia. The springflow was
measured to assess if the spring was influenced by the elevation of Lake Moomaw. Local
precipitation was also reviewed to determine whether variations in springflow were influenced
by rainfall. The spring is approximately 250 feet do
Authors
Bryan Pula, Shaun Wicklein
Age and water-quality characteristics of groundwater discharge to the South Loup River, Nebraska, 2019
Streams in the Loup River Basin are sensitive to groundwater withdrawals because of the close hydrologic connection between groundwater and surface water. The U.S. Geological Survey, in cooperation with the Upper Loup and Lower Loup Natural Resources Districts, and the Nebraska Environmental Trust, studied the age and water-quality characteristics of groundwater near the South Loup River to assess
Authors
Christopher M. Hobza, John E. Solder
Compilation and evaluation of data used to identify groundwater sources under the direct influence of surface water in Pennsylvania
A study was conducted to compile and evaluate data used to identify groundwater sources that are under the direct influence of surface water (GUDI) in Pennsylvania. In the early 1990s, the Pennsylvania Department of Environmental Protection (PADEP) implemented the Surface Water Identification Protocol (SWIP) for the identification of GUDI sources. Since the establishment of the SWIP, PADEP has cla
Authors
Eliza L. Gross, Matthew D. Conlon, Dennis W. Risser, Chad E. Reisch
U.S. Geological Survey national shoreline change— Summary statistics for updated vector shorelines (1800s–2010s) and associated shoreline change data for the Georgia and Florida coasts
Rates of shoreline change have been updated for the open-ocean sandy coastlines of Georgia and Florida as part of the U.S. Geological Survey’s Coastal Change Hazards programmatic focus. This work was formerly within the National Assessment of Shoreline Change project. Shorelines were compiled from the original report published in 2005, recent update reports, and additional light detection and rang
Authors
Meredith G. Kratzmann
Supporting the development and use of native plant materials for restoration on the Colorado Plateau (Fiscal Year 2021 Report)
A primary focus of the Colorado Plateau Native Plant Program (CPNPP) is to identify and develop appropriate native plant materials (NPMs) for current and future restoration projects. Multiple efforts have characterized the myriad challenges inherent in providing appropriate seed resources to enable effective, widespread restoration and have identified a broad suite of research activities to provid
Authors
Robert Massatti, Daniel E. Winkler, Sasha C. Reed, Michael C. Duniway, Seth M. Munson, John B. Bradford
U.S. Geological Survey Hydrologic Toolbox — A graphical and mapping interface for analysis of hydrologic data
The Hydrologic Toolbox is a Windows-based desktop software program that provides a graphical and mapping interface for analysis of hydrologic time-series data with a set of widely used and standardized computational methods. The software combines the analytical and statistical functionality provided in the U.S. Geological Survey Groundwater and Surface-Water Toolboxes and provides several enhancem
Authors
Paul M. Barlow, Amy R. McHugh, Julie E. Kiang, Tong Zhai, Paul Hummel, Paul Duda, Scott Hinz
Hawaii and Landsat
Hawaii stands apart from the rest of the United States, literally and figuratively. The nearest of the eight islands that make up the Hawaiian archipelago is 2,000 miles from the U.S. mainland. Like every bit of land mass within the State, it emerged from the Pacific Ocean after thousands of years of undersea volcanic activity. Kona International Airport, on the “Big Island” of Hawai‘i, was built
Authors
Pennsylvania and Landsat
The Commonwealth of Pennsylvania straddles an array of landscapes. From east to west, its 46,055 square miles connect the sea-level lowlands of the Atlantic seaboard with the rolling hills of the Midwest. It also acts as a bridge between regions from north to south, with the Appalachian Mountains swooping through its center from its northern border with New York to its southern borders with Maryla
Authors
Refining sources of polychlorinated biphenyls in the Back River watershed, Baltimore, Maryland, 2018–2020
Older urban landscapes present unique and complex stressors to urban streams and their habitats through the introduction of legacy and emerging toxic contaminants. Contaminant sources are often associated with various developed land uses such as older residential areas, active and former industrial sites, contaminated sites, and effluents from municipal wastewater treatment plant discharges. These
Authors
Emily Majcher, Upal Ghosh, Trevor P. Needham, Nathalie Lombard, Ellie Foss, Mandare Bokare, Sarahana Joshee, Louis Cheung, Jada Damond, Michelle Lorah
Nevada and Landsat
Nevada’s geography is colorful—and contradictory. As one of the most mountainous States, Nevada shares the country’s second-deepest lake, Lake Tahoe, with neighboring California. It is also the driest State and largely covered by desert. Northern Nevada has long, cold winters, whereas the south has long, hot summers. It is the seventh-largest State, but it ranks in the bottom one-half of States fo
Authors