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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: 85226
2023 Volcanic activity in Alaska and the Northern Mariana Islands—Summary of events and response of the Alaska Volcano Observatory 2023 Volcanic activity in Alaska and the Northern Mariana Islands—Summary of events and response of the Alaska Volcano Observatory
No abstract available.
Authors
Jordan Edward Lubbers, Abigail M. Nastan, Matthew W. Loewen, David Fee, Darren Tan, Ronni Grapenthin, Skye Kushner, Tara Shreve, Matthew M. Haney, Kristi L. Wallace, Christopher F. Waythomas, John A. Power, Yitian Cheng, Aaron Wech, Hannah R. Dietterich
ICCVAM 2024-2025 biennial progress report ICCVAM 2024-2025 biennial progress report
No abstract available.
Authors
Barnett Rattner, Gavin N. Saari, John D. Hansen, Jeffery A. Steevens
Floods of June 20–July 6, 2024, in the Big Sioux River, Rock River, Little Sioux River, Ocheyedan River, and Floyd River Basins, northwestern Iowa Floods of June 20–July 6, 2024, in the Big Sioux River, Rock River, Little Sioux River, Ocheyedan River, and Floyd River Basins, northwestern Iowa
Major flooding occurred on June 20–July 6, 2024, in northwestern Iowa affecting the Big Sioux, Rock, Little Sioux, Ocheyedan, and Floyd River Basins. Heavy rain fell in northwestern Iowa, southwestern Minnesota, and southeastern South Dakota on June 20–22, 2024. Parts of northwestern Iowa recorded 2–6 inches of rainfall and localized amounts exceeding 12 inches. A maximum peak-of-record...
Authors
Padraic S. O’Shea, Andrew M. Williams, Mackenzie K. Marti
Assessment of undiscovered shale-gas resources in the Utica Shale of eastern Canada, 2026 Assessment of undiscovered shale-gas resources in the Utica Shale of eastern Canada, 2026
Using a geology-based assessment methodology, the U.S. Geological Survey estimated undiscovered, technically recoverable mean resources of 9 trillion cubic feet of shale gas in the Utica Shale of eastern Canada.
Authors
Christopher J. Schenk, Tracey J. Mercier, Phuong A. Le, Andrea D. Cicero, Sarah E. Gelman, Jane S. Hearon, Benjamin G. Johnson, Jenny H. Lagesse, Heidi M. Leathers-Miller
Volcanoes are mighty mountains Volcanoes are mighty mountains
Volcanoes are evidence of the remarkable journey of molten rock, which begins miles (kilometers) beneath our feet. What happens on magma’s ascent determines whether it erupts explosively (like Mount St. Helens on May 18, 1980), oozes lava (like Mount St. Helens during its 2004–2008 dome-building event), or cools and crystallizes underground, never to erupt at all. This two-page...
Authors
Elizabeth G. Westby, Kimber Petersen, Sonja Melander
Flood-inundation maps for Río Grande de Arecibo in and near Utuado Municipio, Puerto Rico, 2026 Flood-inundation maps for Río Grande de Arecibo in and near Utuado Municipio, Puerto Rico, 2026
The U.S. Geological Survey (USGS) created digital flood-inundation maps for a 3.4-mile reach of Río Grande de Arecibo in the municipality of Utuado Municipio, Puerto Rico. Water-surface profiles were computed for the stream reach by using a one-dimensional, steady-state, step-backwater model. This model was calibrated to the current (2026) stage-streamflow relation (rating curve number...
Authors
Chad J. Ostheimer, Legna M. Torres-Garcia, Julieta M. Gomez-Fragoso
Home on the range: Where deer and antelope compete with feral horses for limited resources Home on the range: Where deer and antelope compete with feral horses for limited resources
No abstract available.
Authors
Katelyn Davies, Hannah Klugman, Kathryn A. Schoenecker, David Stoner
Trends and seasonal patterns of nitrogen and phosphorus concentrations and loads in two Mississippi Alluvial Plain watersheds following nutrient reduction efforts during 2010–22 Trends and seasonal patterns of nitrogen and phosphorus concentrations and loads in two Mississippi Alluvial Plain watersheds following nutrient reduction efforts during 2010–22
The Mississippi Alluvial Plain ecoregion in Mississippi was historically part of the largest continuous wetland in North America but was clearcut and converted to row crop agriculture beginning in the late 1800s. To reduce the effects of agriculture on surface waters in the Mississippi Alluvial Plain, nutrient reduction best management practices have been implemented throughout the...
Authors
Stephen E. DeVilbiss, Matthew B. Hicks, Emily Gain, Natalie Segrest
Streamflow, water quality, and energy development characteristics and water-quality trends for selected sites in the Green River and Muddy Creek drainage basins, southwestern Wyoming, water years 2006–16 Streamflow, water quality, and energy development characteristics and water-quality trends for selected sites in the Green River and Muddy Creek drainage basins, southwestern Wyoming, water years 2006–16
Energy resource development in southwestern Wyoming has been rapidly expanding since the early 2000s to include innovative technologies for extracting oil and gas and enhancing renewable energy. In response to concerns about the potential negative effects of energy development on natural resources, the Wyoming Landscape Conservation Initiative was created to implement a long-term...
Authors
Steven K. Sando, Cheryl A. Eddy-Miller, Roy Sando, Sara L. Caldwell Eldridge, Seth E. Younger, Haylie M. Brown
Magnitude and frequency of urban floods in Alabama and Mississippi using data through the 2024 water year Magnitude and frequency of urban floods in Alabama and Mississippi using data through the 2024 water year
To improve flood-frequency estimates for urban streams in Alabama and Mississippi, the U.S Geological Survey, in cooperation with the Alabama and Mississippi Departments of Transportation, estimated streamflows corresponding to selected annual exceedance probabilities (AEPs) for 64 streamgages on urban streams in the two States—48 in Alabama and 16 in Mississippi. Using estimates from 42...
Authors
Daniel M. Wagner, Brandon T. Anderson
Special Contributing Area Loading Program user’s manual Special Contributing Area Loading Program user’s manual
Information on the Special Contributing Area Loading Program execution and functions are presented in this user’s manual. An appendix presents a potential improvement for the user to consider. The hydrologic routing simulation method to model flow through multiple reservoirs, or sewer system components, is described. The use of Special Contributing Areas is described to run a successful...
Authors
Richard J. Huizinga, David H Dupre
Water in, no water out—How a rain garden reduced stormwater at City Hall in Gary, Indiana Water in, no water out—How a rain garden reduced stormwater at City Hall in Gary, Indiana
Introduction Urban stormwater runoff can be an issue in many communities because it may cause flooding, overwhelm sewage treatment plants, and negatively affect water quality in local streams, lakes, and other waterbodies. Stormwater runoff can be controlled by using "green infrastructure," which consists of engineered structures that imitate nature to collect stormwater runoff, reduce...
Authors
Becky Hammer-Lester