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: 85231
Flood-inundation maps for the Salamonie River at Portland, Indiana Flood-inundation maps for the Salamonie River at Portland, Indiana
Digital flood-inundation maps for a 6.5-mile reach of the Salamonie River at Portland, Indiana, were created by the U.S. Geological Survey (USGS) in cooperation with the Indiana Department of Transportation. The flood-inundation maps, which can be accessed through the USGS Flood Inundation Mapping Science website at https://water.usgs.gov/osw/flood_inundation/, depict estimates of the...
Authors
Kellan R. Strauch
Global Earthquake Model (GEM) Risk Map Global Earthquake Model (GEM) Risk Map
The Global Earthquake Risk Map (v2018.1) comprises four global maps. The main map presents the geographic distribution of average annual loss (USD) normalized by the average construction costs of the respective country (USD/m2 due to ground shaking in the residential, commercial and industrial building stock, considering contents, structural and non-structural components. The normalized
Authors
Vitor Silva, D. Amo-Oduro, A. Calderon, J. Dabbeek, V. Despotaki, L. Martins, A. Rao, M. Simionato, D. Vigano, C. Yepes, A. Acevedo, H. Crowley, Nick Horspool, Kishor S. Jaiswal, M. Journeay, M. Pittore
Characterization of groundwater resources in the Chequamegon-Nicolet National Forest, Wisconsin: Nicolet Unit Characterization of groundwater resources in the Chequamegon-Nicolet National Forest, Wisconsin: Nicolet Unit
No abstract available.
Authors
Anna Fehling, Ken Bradbury, Peter R. Schoephoester, Stephen Mauel, Andrew T. Leaf, Paul Juckem, Randall Hunt
Characterization of groundwater resources in the Chequamegon-Nicolet National Forest, Wisconsin: Washburn/Great Divide Unit Characterization of groundwater resources in the Chequamegon-Nicolet National Forest, Wisconsin: Washburn/Great Divide Unit
No abstract; report has an executive summary.
Authors
Anna Fehling, Ken Bradbury, Peter R. Schoephoester, Stephen Mauel, Andrew T. Leaf, Paul Juckem, Randall Hunt
Characterization of groundwater resources in the Chequamegon-Nicolet National Forest, Wisconsin: Medford Unit Characterization of groundwater resources in the Chequamegon-Nicolet National Forest, Wisconsin: Medford Unit
No abstract available.
Authors
Ken Bradbury, Stephen Mauel, Peter R. Schoephoester, Anna Fehling, Andrew T. Leaf, Paul Juckem, Randall J. Hunt, Aaron Pruitt
Executive summary. In Second State of the Carbon Cycle Report (SOCCR2): A Sustained Assessment Report Executive summary. In Second State of the Carbon Cycle Report (SOCCR2): A Sustained Assessment Report
Central to life on Earth, carbon is essential to the molecular makeup of all living things and plays a key role in regulating global climate. To understand carbon’s role in these processes, researchers measure and evaluate carbon stocks and fluxes. A stock is the quantity of carbon contained in a pool or reservoir in the Earth system (e.g., carbon in forest trees), and a flux is the...
Authors
Richard Birdsey, Melanie A. Mayes, Patricia Romero-Lankao, Raymond G. Najjar, Sasha C. Reed, Nancy Cavallaro, Gyami Shrestha, Daniel J. Hayes, Laura Lorenzoni, Anne Marsh, Kathy Tedesco, Tom Wirth, Zhiliang Zhu
Natural resource condition assessment: Olympic National Park Natural resource condition assessment: Olympic National Park
The Natural Resource Assessment Program aims to document condition and trends of selected park resources while identifying emerging issues and information needs. This information is intended to serve as a platform for natural resource managers to use in developing future resource stewardship priorities and planning. Olympic National Park (OLYM) on Washington’s Olympic Peninsula protects...
A full annual-cycle conservation strategy for Sprague’s Pipit, Chestnut-collared and McCown’s Longspurs, and Baird’s Sparrow A full annual-cycle conservation strategy for Sprague’s Pipit, Chestnut-collared and McCown’s Longspurs, and Baird’s Sparrow
Sprague’s Pipit (Anthus spragueii), Chestnut-collared Longspur (Calcarius ornatus), McCown’s Longspur (Rhynchophanes mccownii), and Baird’s Sparrow (Centronyx bairdii) [hereafter, “the Species”] are North American grassland-obligate songbirds whose populations have experienced significant annual population declines and are the focus of increasing conservation concern. The purpose of this...
Authors
Scott G. Somershoe, Lawrence Igl, Jessica A. Larson, Cheryl A. Mandich, Neal D. Niemuth, Marisa K. Sather, Sean P. Fields, Barry G. Robinson, Corrie C. Borgman, Maureen D. Correll, Kevin S. Ellison, Robert P. Ford, Arvind O. Panjabi, Dan Casey, Sarah D. Hewitt, Sandy K. Johnson, Catherine A. Wightman, Allison J.P. Begley
Estimating metal concentrations with regression analysis and water-quality surrogates at nine sites on the Animas and San Juan Rivers, Colorado, New Mexico, and Utah Estimating metal concentrations with regression analysis and water-quality surrogates at nine sites on the Animas and San Juan Rivers, Colorado, New Mexico, and Utah
The purpose of this report is to evaluate the use of site-specific regression models to estimate metal concentrations at nine U.S. Geological Survey streamflow-gaging stations on the Animas and San Juan Rivers in Colorado, New Mexico, and Utah. Downstream users could use these regression models to determine if metal concentrations are elevated and pose a risk to water supplies...
Authors
M. Alisa Mast
Assessing the impact of open-ocean and back-barrier shoreline change on Dauphin Island, Alabama, at multiple time scales over the last 75 years Assessing the impact of open-ocean and back-barrier shoreline change on Dauphin Island, Alabama, at multiple time scales over the last 75 years
Dauphin Island and Little Dauphin Island, collectively, make up a geomorphically complex barrier island system located along Alabama’s southern coast, separating Mississippi Sound from the Gulf of Mexico and Mobile Bay. The barrier island system provides numerous economical (tourism, fisheries) and natural (habitat for migratory birds, natural protection of inland and coastal areas from...
Authors
Christopher G. Smith, Joseph W. Long, Rachel E. Henderson, Paul R. Nelson
Land subsidence along the California Aqueduct in west-central San Joaquin Valley, California, 2003–10 Land subsidence along the California Aqueduct in west-central San Joaquin Valley, California, 2003–10
Extensive groundwater withdrawal from the unconsolidated deposits in the San Joaquin Valley caused widespread aquifer-system compaction and resultant land subsidence from 1926 to 1970—locally exceeding 8.5 meters. The importation of surface water beginning in the early 1950s through the Delta-Mendota Canal and in the early 1970s through the California Aqueduct resulted in decreased...
Authors
Michelle Sneed, Justin T. Brandt, Michael Solt
Groundwater-storage change and land-surface elevation change in Tucson Basin and Avra Valley, south-central Arizona--2003-2016 Groundwater-storage change and land-surface elevation change in Tucson Basin and Avra Valley, south-central Arizona--2003-2016
The U.S. Geological Survey monitors groundwater-storage change and land-surface elevation change caused by groundwater withdrawal in Tucson Basin and Avra Valley—the two most populated alluvial basins within the Tucson Active Management Area. The Tucson Active Management Area is one of five active management areas in Arizona established by the 1980 Groundwater Management Act and governed...
Authors
Robert L. Carruth, Libby M. Wildermuth, Brian D. Conway