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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Nutrient, organic carbon, and chloride concentrations and loads in selected Long Island Sound tributaries—Four decades of change following the passage of the Federal Clean Water Act Nutrient, organic carbon, and chloride concentrations and loads in selected Long Island Sound tributaries—Four decades of change following the passage of the Federal Clean Water Act
Trends in long-term water-quality and streamflow data from 14 water-quality monitoring sites in Connecticut were evaluated for water years 1974–2013 and 2001–13, coinciding with implementation of the Clean Water Act of 1972 and the Connecticut Nitrogen Credit Exchange program, as part of an assessment of nutrient and chloride concentrations and loads discharged to Long Island Sound. In...
Authors
John R. Mullaney
Populations of concern Populations of concern
Climate change is already causing, and is expected to continue to cause, a range of health impacts that vary across different population groups in the United States. The vulnerability of any given group is a function of its sensitivity to climate change related health risks, its exposure to those risks, and its capacity for responding to or coping with climate variability and change...
Authors
Janet Gamble, John Balbus, Martha Berger, Karen Bouye, Vince Campbell, Karletta Chief, K. Conlon, Allison Crimmins, Barry Flanagan, C. Gonzalez-Maddux, E. Hallisey, S. Hutchins, L. Jantarasami, S. Khoury, M. Kiefer, J. Kolling, K. Lynn, A. Manangan, M. McDonald, R. Morello-Frosch, Margaret Hiza, P. Sheffield, K. Thigpen Tart, J. Watson, K.P. Whyte, A.F. Wolkin
Potentiometric surface and water-level difference maps of selected confined aquifers in Southern Maryland and Maryland’s Eastern Shore, 1975-2015 Potentiometric surface and water-level difference maps of selected confined aquifers in Southern Maryland and Maryland’s Eastern Shore, 1975-2015
Key Results This report presents potentiometric-surface maps of the Aquia and Magothy aquifers and the Upper Patapsco, Lower Patapsco, and Patuxent aquifer systems using water levels measured during September 2015. Water-level difference maps are also presented for these aquifers. The water-level differences in the Aquia aquifer are shown using groundwater-level data from 1982 and 2015...
Authors
Stephen E. Curtin, Andrew W. Staley, David C. Andreasen
Primary production in the Sacramento-San Joaquin Delta: A science strategy to quantify change and identify future potential Primary production in the Sacramento-San Joaquin Delta: A science strategy to quantify change and identify future potential
No abstract available.
Authors
April Robinson, Amy Richey, James E. Cloern, Katharyn E. Boyer, Jon Burau, Elizabeth A. Canuel, John F. DeGeorge, Judith Z. Drexler, E. R. Howe, Ronald Kneib, Anke Mueller-Solger, James L. Pinckney, Robert J. Naiman, David H. Schoellhamer, Charles A. Simenstad
Prioritizing landscapes for longleaf pine conservation Prioritizing landscapes for longleaf pine conservation
We developed a spatially explicit model and map, as a decision support tool (DST), to aid conservation agencies creating or maintaining open pine ecosystems. The tool identified areas that are likely to provide the greatest benefit to focal bird populations based on a comprehensive landscape analysis. We used NLCD 2011, SSURGO, and SEGAP data to map the density of desired resources for...
Authors
J. Barry Grand, Kevin J. Kleiner
Proceedings of the 2015 international summit on fibropapillomatosis: Global status, trends, and population impacts Proceedings of the 2015 international summit on fibropapillomatosis: Global status, trends, and population impacts
The 2015 International Summit on Fibropapillomatosis (FP) was convened in Honolulu, Hawaii June 11-14, 2015. Scientists from around the world were invited to present results from sea turtle monitoring and research programs as they relate to the global status, trends, and population impacts of FP on green turtles. The participants engaged in discussions that resulted in the following...
Authors
Stacy A. Hargrove, Thierry M. Work, Shandell Brunson, Allen M. Foley, George H. Balazs
Regional water table (2014) in the Mojave River and Morongo Groundwater Basins, southwestern Mojave Desert, California Regional water table (2014) in the Mojave River and Morongo Groundwater Basins, southwestern Mojave Desert, California
Data for static water-levels measured in about 610 wells during March-April 2014 by the U.S. Geological Survey (USGS), the Mojave Water Agency (MWA), and other local water districts were compiled to construct a regional water-table map. This map shows the elevation of the water table and general direction of groundwater movement in and around the Mojave River and Morongo groundwater...
Authors
Nick F. Teague, Meghan C. Dick, Sally F. House, Dennis A. Clark
Review of suspended sediment in lower South Bay relevant to light attenuation and phytoplankton blooms Review of suspended sediment in lower South Bay relevant to light attenuation and phytoplankton blooms
Lower South Bay (LSB), a shallow subembayment of San Francisco Bay (SFB), is situated south of the Dumbarton Bridge, and is surrounded by, and interconnected with, a network of sloughs, marshes, and former salt ponds undergoing restoration (Figure ES.1). LSB receives 120 million gallons per day of treated wastewater effluent from three publicly owned treatment works (POTWs) that service...
Authors
David H. Schoellhamer, Gregory Shellenbarger, Maureen A. Downing-Kunz, Andrew J. Manning
San Pedro River Aquifer Binational Report San Pedro River Aquifer Binational Report
The United States and Mexico share waters in a number of hydrological basins and aquifers that cross the international boundary. Both countries recognize that, in a region of scarce water resources and expanding populations, a greater scientific understanding of these aquifer systems would be beneficial. In light of this, the Mexican and U.S. Principal Engineers of the International...
Authors
James B. Callegary, Ismael Minjarez Sosa, Elia Maria Tapia Villasenor, Placido dos Santos, Rogelio Monreal Saavedra, Franciso Javier Grijalva Noriega, A. K. Huth, Floyd Gray, C. A. Scott, Sharon Megdal, L. A. Oroz Ramos, Miguel Rangel Medina, James M. Leenhouts
Science framework for the conservation and restoration strategy of DOI secretarial order 3336: Utilizing resilience and resistance concepts to assess threats to sagebrush ecosystems and greater sage-grouse, prioritize conservation and restoration actions, Science framework for the conservation and restoration strategy of DOI secretarial order 3336: Utilizing resilience and resistance concepts to assess threats to sagebrush ecosystems and greater sage-grouse, prioritize conservation and restoration actions,
The Science Framework for the Conservation and Restoration Strategy of the Department of the Interior, Secretarial Order 3336 (SO 3336), Rangeland Fire Prevention, Management and Restoration, provides a strategic, multiscale approach for prioritizing areas for management and determining effective management strategies across the sagebrush biome. The emphasis of this version is on...
Authors
Jeanne C. Chambers, Steve Campbell, John Carlson, Jeffrey L. Beck, Karen J. Clause, Jonathan B. Dinkins, Kevin E. Doherty, Shawn Espinosa, Kathleen A. Griffin, Thomas J. Christiansen, Michele R. Crist, Steve E. Hanser, Douglas W. Havlina, Kenneth F. Henke, Jacob D. Hennig, Laurie L. Kurth, Jeremy D. Maestas, Kenneth E. Mayer, Mary E. Manning, Brian A. Mealor, Clinton McCarthy, Mike Pellant, Karen L. Prentice, Marco A. Perea, Lief A. Wiechman, David A. Pyke, Amarina Wuenschel
Status and trends in the Lake Superior fish community, 2015 Status and trends in the Lake Superior fish community, 2015
In 2015, the Lake Superior fish community was sampled with daytime bottom trawls at 76 nearshore and 33 offshore stations. Spring and summer water temperatures in 2015 were colder than average, but warmer than that observed in 2014. In the nearshore zone, a total of 11,882 individuals from 22 species or morphotypes were collected. Nearshore lakewide mean biomass was 1.8 kg/ha, which was...
Authors
Mark R. Vinson, Lori M. Evrard, Owen T. Gorman, Daniel L. Yule
Status and trends of the Lake Huron offshore demersal fish community, 1976-2015 Status and trends of the Lake Huron offshore demersal fish community, 1976-2015
The USGS Great Lakes Science Center has conducted trawl surveys to assess annual changes in the offshore demersal fish community of Lake Huron since 1973. Sample sites include five ports in U.S. waters with less frequent sampling near Goderich, Ontario. The 2015 fall bottom trawl survey was carried out between 14 and 28 October and included all U.S. ports, as well as Goderich, ON. The...
Authors
Edward F. Roseman, Margret Ann Chriscinske, Dana Kristina Castle, Carson G. Prichard