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: 84795
The hydrologic system of the south Florida peninsula—Development and application of the Biscayne and Southern Everglades Coastal Transport (BISECT) model The hydrologic system of the south Florida peninsula—Development and application of the Biscayne and Southern Everglades Coastal Transport (BISECT) model
The Biscayne and Southern Everglades Coastal Transport (BISECT) model was developed by the U.S. Geological Survey under the Greater Everglades Priority Ecosystem Studies Initiative to evaluate, both separately and in conjunction, the likely effects on surface-water stages and flows, hydroperiod, and groundwater levels and salinity in south Florida of (1) a vertical Biscayne aquifer...
Authors
Eric D. Swain, Melinda A. Lohmann, Carl R. Goodwin
An evaluation of methods for computing annual water-quality loads An evaluation of methods for computing annual water-quality loads
The U.S. Geological Survey publishes information on the mass, or load, of water-quality constituents transported through rivers and streams sampled as part of the operation of the National Water Quality Network (NWQN). This study evaluates methods for computing annual water-quality loads, specifically with respect to procedures currently (2019) used at sites in the NWQN. Near-daily...
Authors
Casey J. Lee, Robert M. Hirsch, Charles G. Crawford
Estimated use of water in the Cumberland River watershed in 2010 and projections of public-supply water use to 2040 Estimated use of water in the Cumberland River watershed in 2010 and projections of public-supply water use to 2040
The U.S. Army Corps of Engineers (USACE), Nashville District, is conducting ongoing water-supply analyses of USACE reservoirs in the Cumberland River watershed to identify areas where potential water-resources issues may arise in the future. To assist the USACE in their efforts, the U.S. Geological Survey, in cooperation with the USACE, collected and analyzed water-use data to estimate...
Authors
John A. Robinson
Regional-scale associations between indicators of biological integrity and indicators of streamflow modification Regional-scale associations between indicators of biological integrity and indicators of streamflow modification
Although streamflow is widely recognized as a controlling factor in stream health, empirical relations between indicators of anthropogenic modification of streamflow and ecological indicators have been elusive. The objective of this report is to build upon specific findings reported in recent publications by providing a library of empirical models that describe the relations between...
Authors
Daren M. Carlisle, Theodore E. Grantham, Ken Eng, David M. Wolock
California sea otter (Enhydra lutris nereis) census results, spring 2019 California sea otter (Enhydra lutris nereis) census results, spring 2019
The 2019 census of southern sea otters (Enhydra lutris nereis), also known as California sea otters, was conducted from early May to early July along the mainland coast of central California and in April at San Nicolas Island in southern California. The range-wide index, defined as the 3-year average of combined counts from the mainland range and San Nicolas Island, was 2,962, a decrease...
Authors
Brian B. Hatfield, Julie L. Yee, Michael C. Kenner, Joseph A. Tomoleoni
U.S. Geological Survey energy and wildlife research annual report for 2019 U.S. Geological Survey energy and wildlife research annual report for 2019
Access to affordable and reliable energy remains a critical need for people and the economy. To satisfy society’s demand for energy, the United States is expanding access to vast natural resources to produce electricity as well as petroleum and natural gas products. Development of our Nation’s energy resources, however, often conflicts directly with the equally vast fish and wildlife...
U.S. Geological Survey sagebrush ecosystem research annual report for 2019 U.S. Geological Survey sagebrush ecosystem research annual report for 2019
The sagebrush (Artemisia spp.) ecosystem extends across a large portion of the Western United States. Affected by multiple stressors, including interactions among fire, exotic plant invasions, and human land uses, this ecosystem has experienced significant loss, fragmentation, and degradation of landscapes once dominated by sagebrush. In turn, wildlife populations have declined following...
U.S. Geological Survey energy and wildlife research annual report for 2019 postcard U.S. Geological Survey energy and wildlife research annual report for 2019 postcard
This postcard provides details about the U.S. Geological Survey (USGS) Energy and Wildlife Research Annual Report for 2019, which highlights new research on the interactions of energy development with wildlife. Encompassing investigations of conventional and renewable energy development across the United States, from the Arctic Coastal Plain of Alaska to the balmy waters of Florida, the...
Authors
Mona Khalil
Yellowstone grizzly bear investigations: Annual report of the Interagency Grizzly Bear Study Team 2018 Yellowstone grizzly bear investigations: Annual report of the Interagency Grizzly Bear Study Team 2018
This annual report summarizes the results of grizzly bear (Ursus arctos) research and monitoring conducted in the Greater Yellowstone Ecosystem (GYE) by the Interagency Grizzly Bear Study Team (IGBST) during 2018. The research and monitoring program is focused on population estimation and demographics, food monitoring, and habitat monitoring. The report also contains a summary of grizzly...
Authors
Frank T. van Manen, Mark A. Haroldson, Bryn Karabensh
Water priorities for the nation—The U.S. Geological Survey next generation water observing system Water priorities for the nation—The U.S. Geological Survey next generation water observing system
The challenges of providing safe and sustainable water supplies for human and ecological uses and protecting lives and property during water emergencies are well recognized. The U.S. Geological Survey (USGS) plays an essential role in meeting these challenges through its observational networks and renowned water science and research activities (National Academies of Science, Engineering...
Authors
Sandra M. Eberts, Chad R. Wagner, Michael D. Woodside
Water resources of Lincoln Parish, Louisiana Water resources of Lincoln Parish, Louisiana
Information concerning the availability, use, and quality of water in Lincoln Parish, Louisiana, is critical for proper water-supply management. The purpose of this fact sheet is to present information that can be used by water managers, parish residents, and others for stewardship of this vital resource. In 2014, about 7.76 million gallons per day (Mgal/d) of water were withdrawn in...
Authors
Vincent E. White
Water resources of Winn Parish, Louisiana Water resources of Winn Parish, Louisiana
Information concerning the availability, use, and quality of water in Winn Parish, Louisiana, is critical for proper water-supply management. The purpose of this fact sheet is to present information that can be used by water managers, parish residents, and others for stewardship of this vital resource. In 2014, about 2.74 million gallons per day (Mgal/d) of water were withdrawn in Winn...
Authors
Vincent E. White