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
Research, monitoring, and evaluation of emerging issues and measures to recover the Snake River fall Chinook salmon ESU Research, monitoring, and evaluation of emerging issues and measures to recover the Snake River fall Chinook salmon ESU
The portion of the Snake River fall Chinook Salmon Oncorhynchus tshawytscha ESU that spawns upstream of Lower Granite Dam transitioned from low to high abundance during 1992–2017 in association with U.S. Endangered Species Act recovery efforts and other federally mandated actions. This annual report focuses on (1) numeric and habitat use responses by natural- and hatchery-origin spawners...
Authors
Kenneth Tiffan, John M. Plumb, Russell W. Perry, John Erhardt, Rulon J. Hemingway, Brad Bickford, Tobyn N. Rhodes, William P. Connor, Frank L. Mullins
Adaptive harvest management for the Svalbard population of pink-footed geese: 2018 progress summary Adaptive harvest management for the Svalbard population of pink-footed geese: 2018 progress summary
This report describes progress on development and implementation of an adaptive harvest management program for maintaining the Svalbard population of Pink-footed Geese (Anser brachyrhynchus) near their target level (60,000) by providing sustainable harvests in Norway and Denmark. Specifically, this report provides an assessment of recent monitoring information and its implications for...
Authors
Fred A. Johnson, Gitte Hoj Jensen, Kevin K. Clausen, Jesper Madsen
Assessment of undiscovered oil and gas resources of the Susitna Basin, southern Alaska, 2017 Assessment of undiscovered oil and gas resources of the Susitna Basin, southern Alaska, 2017
The U.S. Geological Survey (USGS) recently completed an assessment of undiscovered, technically recoverable oil and gas resources in the Susitna Basin of southern Alaska. Using a geology-based methodology, the USGS estimates that mean undiscovered volumes of about 2 million barrels of oil and nearly 1.7 trillion cubic feet of gas may be found in this area.
Authors
Richard G. Stanley, Christopher J. Potter, Kristen A. Lewis, Paul G. Lillis, Anjana K. Shah, Peter J. Haeussler, Jeffrey D. Phillips, Zenon C. Valin, Christopher J. Schenk, Timothy R. Klett, Michael E. Brownfield, Ronald M. Drake, Thomas M. Finn, Seth S. Haines, Debra K. Higley, David W. Houseknecht, Phuong A. Le, Kristen R. Marra, Tracey J. Mercier, Heidi M. Leathers-Miller, Stanley T. Paxton, Ofori N. Pearson, Marilyn E. Tennyson, Cheryl A. Woodall, Margarita V. Zyrianova
Discharge, sediment, and water chemistry in Clear Creek, western Nevada, water years 2013–16 Discharge, sediment, and water chemistry in Clear Creek, western Nevada, water years 2013–16
Clear Creek is a small stream that drains the eastern Carson Range near Lake Tahoe, flows roughly parallel to the Highway 50 corridor, and discharges to the Carson River near Carson City, Nevada. Historical and ongoing development in the drainage basin is thought to be affecting Clear Creek and its sediment-transport characteristics. Previous studies from water years (WYs) 2004 to 2007...
Authors
Jena M. Huntington, Daniel J. Riddle, Angela P. Paul
Pacific Northwest Aquatic Monitoring Partnership 2017 Annual Report Pacific Northwest Aquatic Monitoring Partnership 2017 Annual Report
The Pacific Northwest Aquatic Monitoring Partnership (PNAMP) continued to promote the integration of monitoring resources and development of tools to support monitoring in 2017. Improved coordination and integration of goals, objectives, and activities among Pacific Northwest monitoring programs is essential to improving the quality and consistency of monitoring in the region. PNAMP...
Authors
Amy L. Puls, Rebecca A. Scully, Megan M. Dethloff, Jennifer M. Bayer, Sheryn J. Olson, Samuel A. Cimino
Population dynamics of the northern tamarisk beetle (Diorhabda carinulata) in the Colorado River Basin Population dynamics of the northern tamarisk beetle (Diorhabda carinulata) in the Colorado River Basin
Throughout the Southwestern United States, riparian systems contain narrow belts of vegetation along streams and rivers. Although only a small percentage of the total land cover, this ecosystem is important for maintaining high species diversity and population densities of birds. Anthropogenic changes to Western riverine systems have enhanced their susceptibility to invasion by...
Authors
Levi R. Jamison, Charles van Riper
Taiga bean goose: Harvest assessment for the Central Management Unit: 2018 Taiga bean goose: Harvest assessment for the Central Management Unit: 2018
In 2016 the European Goose Management International Working Group (EGM IWG) began development of an adaptive harvest management program for Taiga Bean Geese (TBG). In 2017, the EGM IWG adopted an interim harvest strategy consisting of a constant harvest rate (on adults) of 3% for the Central Management of Taiga Bean Geese. The interim strategy is intended to provide limited hunting...
Authors
Fred A. Johnson, Gitte Hoj Jensen, Mikko Alhainen, Anthony D. Fox, Jesper Madsen
Estimation of unregulated monthly, annual, and peak streamflows in Forest City Stream and lake levels in East Grand Lake, United States-Canada border between Maine and New Brunswick Estimation of unregulated monthly, annual, and peak streamflows in Forest City Stream and lake levels in East Grand Lake, United States-Canada border between Maine and New Brunswick
The U.S. Geological Survey, in cooperation with the International Joint Commission, compiled historical data on regulated streamflows and lake levels and estimated unregulated streamflows and lake levels on Forest City Stream at Forest City, Maine, and East Grand Lake on the United States-Canada border between Maine and New Brunswick to study the effects on streamflows and lake levels if...
Authors
Pamela J. Lombard
Laboratory observations of artificial sand and oil agglomerates Laboratory observations of artificial sand and oil agglomerates
Sand and oil agglomerates (SOAs) form when weathered oil reaches the surf zone and combines with suspended sediments. The presence of large SOAs in the form of thick mats (up to 10 centimeters [cm] in height and up to 10 square meters [m2] in area) and smaller SOAs, sometimes referred to as surface residual balls (SRBs), may lead to the re-oiling of beaches previously affected by an oil...
Authors
Robert L. Jenkins, P. Soupy Dalyander, Allison Penko, Joseph W. Long
A metabolism-based whole lake eutrophication model to estimate the magnitude and time scales of the effects of restoration in Upper Klamath Lake, south-central Oregon A metabolism-based whole lake eutrophication model to estimate the magnitude and time scales of the effects of restoration in Upper Klamath Lake, south-central Oregon
A whole lake eutrophication (WLE) model approach for phosphorus and cyanobacterial biomass in Upper Klamath Lake, south-central Oregon, is presented here. The model is a successor to a previous model developed to inform a Total Maximum Daily Load (TMDL) for phosphorus in the lake, but is based on net primary production (NPP), which can be calculated from dissolved oxygen, rather than...
Authors
Susan A. Wherry, Tamara M. Wood
Measurements of erosion potential using Gust chamber in Yolo Bypass near Sacramento, California Measurements of erosion potential using Gust chamber in Yolo Bypass near Sacramento, California
This report describes work performed to quantify the erodibility of surface soils in the Yolo Bypass (Bypass) near Sacramento, California, for use in the California Department of Water Resources (DWR) Yolo Bypass D-MCM mercury model. The Bypass, when not serving as a floodway, is heavily utilized for agriculture. During flood events, surface water flows over the soil, resulting in the...
Authors
Paul A. Work, David H. Schoellhamer
Distribution and demography of San Francisco gartersnakes (Thamnophis sirtalis tetrataenia) at Mindego Ranch, Russian Ridge Open Space Preserve, San Mateo County, California Distribution and demography of San Francisco gartersnakes (Thamnophis sirtalis tetrataenia) at Mindego Ranch, Russian Ridge Open Space Preserve, San Mateo County, California
San Francisco gartersnakes (Thamnophis sirtalis tetrataenia) are a subspecies of common gartersnakes endemic to the San Francisco Peninsula of northern California. Because of habitat loss and collection for the pet trade, San Francisco gartersnakes were listed as endangered under the precursor to the Federal Endangered Species Act. A population of San Francisco gartersnakes resides at...
Authors
Richard Kim, Brian J. Halstead, Glenn D. Wylie, Michael L. Casazza