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: 84596
Sediment accumulation rates and volume in Pahranagat Wash above Arrow Canyon Dam in northern Moapa Valley, Nevada Sediment accumulation rates and volume in Pahranagat Wash above Arrow Canyon Dam in northern Moapa Valley, Nevada
An evaluation of sediment deposition rates and volume of impounded sediments in Pahranagat Wash behind Arrow Canyon dam in southeastern Nevada was done between 2016 and 2022. Data were collected and interpreted to address concerns by the Moapa Band of Paiutes and local historical preservation groups regarding the burial of culturally important sites by the impounded sediment deposited...
Authors
Jon W. Wilson, Boris Poff, Christopher C. Fuller
U.S. Geological Survey—Department of the Interior, Region 11, Alaska—2023–24 biennial science report U.S. Geological Survey—Department of the Interior, Region 11, Alaska—2023–24 biennial science report
Introduction U.S. Geological Survey (USGS) Mission—The USGS national mission is to monitor, analyze, and predict the current and evolving dynamics of complex human and natural Earth-system interactions and to deliver actionable information at scales and timeframes relevant to decision makers. Consistent with the national mission, the USGS in Alaska provides timely and objective...
Responding to ecological transformation in Capitol Reef National Park, Utah—Employee perspectives from pilot interviews from the Cross-Park Resist-Assist-Direct Project Responding to ecological transformation in Capitol Reef National Park, Utah—Employee perspectives from pilot interviews from the Cross-Park Resist-Assist-Direct Project
Executive Summary Climate change is causing a range of changes that can affect the natural, cultural, and built resources of the Nation’s protected areas and affect opportunities to visit and recreate in these spaces. Changes in temperature and precipitation patterns also affect species and habitats, leading to ecological transformation. This report describes findings from pilot research...
Authors
Amanda E. Cravens, Zachary B. Hough Solomon, Julia B. Goolsby, Heather M. Yocum, Stefan Tangen, Wylie Carr
Assessment of dragonfly and damselfly (Odonata) occupancy and habitat suitability at −12 Mile Slough, Glen Canyon National Recreation Area, Arizona Assessment of dragonfly and damselfly (Odonata) occupancy and habitat suitability at −12 Mile Slough, Glen Canyon National Recreation Area, Arizona
Management practices that enhance habitat complexity in dam tailwaters often aim to increase biodiversity and improve ecosystem health. However, in other instances, management practices may simplify habitat features to help minimize the establishment of invasive species. These tradeoffs are complex, particularly in the face of drought and warming water temperatures. In Glen Canyon...
Authors
Anya Metcalfe, Morgan Ford, Lawrence E. Stevens, Theodore Kennedy
Status report on the Long-Term Experimental and Management Plan (LTEMP) Metrics for the Glen Canyon Dam adaptive management program Status report on the Long-Term Experimental and Management Plan (LTEMP) Metrics for the Glen Canyon Dam adaptive management program
No abstract available.
Authors
Helen C. Fairley, Gregory Mark Anderson, Andrew Alan Schultz, Joel B. Sankey, Joshua Caster, Lauren Lynn Tango, Bridget Deemer, Theodore Kennedy, Anya Metcalfe, Emily C. Palmquist, Maria C. Dzul, Kimberly L. Dibble, David Ward, David L. Rogowski, Emily C. Omana Smith, Jeffrey Arnold, Brian D. Healy, Charles Yackulic, Lucas Bair, David J. Topping, Paul Grams, Katherine Anne Chapman, Robert B. Tusso, Dale Fonken, Josh Korman, Lindsay Erika Hansen, Benjamin John Miller, John M. Fennell, Drew Elliot Eppehimer, Claudia James Dimartini, Nathaniel D. Bransky
Gas chemistry and isotope data for volcano monitoring at the Lassen Volcanic Center, Lassen Volcanic National Park Gas chemistry and isotope data for volcano monitoring at the Lassen Volcanic Center, Lassen Volcanic National Park
This report presents chemical and isotopic compositions of volcanic gases collected from thermal areas within Lassen Volcanic National Park in northern California from 1974 through 2019. As the southernmost volcano in the Cascade Range and designated a very-high-threat volcano by the U.S. Geological Survey, the Lassen Volcanic Center (LVC) requires consistent monitoring to assess...
Authors
Deborah Bergfeld, Jennifer L. Lewicki, Sara Peek, Andrew Hunt
Rapid structured decision making for Hypomesus transpacificus (delta smelt) summer–fall freshwater outflow management Rapid structured decision making for Hypomesus transpacificus (delta smelt) summer–fall freshwater outflow management
Managers of the Central Valley Project (CVP) and State Water Projects (SWP) in California are confronted with difficult tradeoffs between water uses and associated values affected by water management decisions. These decisions involve altering the timing and magnitude of water releases from dams and reservoirs, which can affect habitats for economically important and Federally and State...
Authors
Brian D. Healy, Corey C. Phillis, Brian Mahardja, Cameron Koizumi, Catarina Pien, Nancy Parker, J. Louise Conrad, Julie Ekstrom, Julie Leimbach, Rafael Silberblatt, Tom Fischer, Chase Ehlo
USGS—An Unparalleled Scientific Asset USGS—An Unparalleled Scientific Asset
The U.S. Geological Survey (USGS) delivers information critical to powering our economy, managing our natural resources, and keeping Americans safe and healthy.1Mapping the Nation $21B Geologic maps save users an estimated 15% in annual costs: a value of between $14B and $21B. $25.6B is the annual value to users of key Earth observation platforms like Landsat, which is managed by the...
Authors
Shonte Jenkins, Emily Pindilli, David Applegate, Rachel E. Reagan
Conceptual and numerical groundwater flow model of the Iowa River alluvial aquifer near Tama County, Iowa, 1980 through 2022 Conceptual and numerical groundwater flow model of the Iowa River alluvial aquifer near Tama County, Iowa, 1980 through 2022
The Iowa River alluvial aquifer is an important source of water on the Meskwaki Settlement in Tama County, Iowa, which is land owned by the Sac & Fox Tribe of the Mississippi in Iowa (commonly known as the Meskwaki Nation). The U.S. Geological Survey constructed a groundwater flow model, including a conceptual and numerical model, of the Iowa River alluvial aquifer and underlying...
Authors
Kendall M.F. Goldstein, Kyle W. Davis
Geochemical and hydrological investigations of historical data collected at the Lee Acres Landfill and Giant Bloomfield Refinery, New Mexico, 1985–2020 Geochemical and hydrological investigations of historical data collected at the Lee Acres Landfill and Giant Bloomfield Refinery, New Mexico, 1985–2020
The Lee Acres Landfill and Giant Bloomfield Refinery are adjacent properties near the City of Farmington, New Mexico, each having undergone monitoring and remediation related to historical site activities. At the landfill, site cleanup has included the installation of a capillary barrier over former liquid waste lagoons and periodic monitoring of groundwater elevations and groundwater...
Authors
Erin L. Gray, Christina L. Ferguson
Exploring atmospheric deposition chemistry data across the United States Exploring atmospheric deposition chemistry data across the United States
The National Atmospheric Deposition Program (NADP) collects atmospheric data to monitor air pollution effects on the quality of United States water supplies and ecosystems. The NADP requires consistent data collection at fixed locations and is governed by a committee with participation by many Federal and State agencies, universities, Tribes, and private companies. NADP conducts a spring...
Authors
Ryan C. McCammon, Noel A. Deyette, Gregory A. Wetherbee
A summary of grizzly bear distribution in the lower-48 US states in 2024 A summary of grizzly bear distribution in the lower-48 US states in 2024
Understanding the distribution of grizzly bear populations in the lower-48 states, is important for their conservation and management, and for public safety. Previously, our research teams working in grizzly bear ecosystems in the lower-48 states used varying methods to estimate distribution of grizzly bear populations. In the Greater Yellowstone Ecosystem (GYE) and Northern Continental...
Authors
Cecily M. Costello, Justin A. Dellinger, Jennifer K. Fortin-Noreus, Mark Haroldson, Bryn Karabensh, Wayne F. Kasworm, Lori L. Roberts, Justin E. Teisberg, Frank T. van Manen, Tyler J. Vent