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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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Conceptual hydrogeologic framework and groundwater budget near the southeastern part of Puget Sound, Washington Conceptual hydrogeologic framework and groundwater budget near the southeastern part of Puget Sound, Washington

More than 1 million people live within the active model area (AMA) in the southeastern part of the lowlands surrounding Puget Sound, or Puget Lowland, Washington, and groundwater is the source for approximately one-half of their public, domestic, and irrigation water demands. The 887-square-mile AMA, located in King and Pierce Counties, represents the area of analysis for the conceptual
Authors
Wendy B. Welch, Valerie A.L. Bright, Andrew S. Gendaszek, Sarah B. Dunn, Alexander O. Headman, Elisabeth T. Fasser
By
Water Resources Mission Area, Washington Water Science Center

Invasive blue catfish in the Chesapeake Bay: A risk to realizing Bay restoration investments Invasive blue catfish in the Chesapeake Bay: A risk to realizing Bay restoration investments

Introduction The partners of the Chesapeake Bay are investing billions of dollars in the restoration of critical habitats to improve conditions for people and living resources throughout the Bay and its watershed. However, the recent proliferation of invasive Ictalurus furcatus (blue catfish) in the Chesapeake Bay’s major rivers has the potential to disrupt these restoration efforts and...
Authors
Ellen Robertson, Jenn Malpass, Christopher Ottinger, John Griffin, Christine Densmore, Kenneth Hyer
By
Chesapeake Bay Activities, Eastern Ecological Science Center

Characterization of groundwater resources near the southeastern part of Puget Sound, Washington Characterization of groundwater resources near the southeastern part of Puget Sound, Washington

More than 1 million people live within the active model area (AMA) in the southeastern part of the lowlands surrounding Puget Sound, or Puget Lowland, Washington, and groundwater is the source for approximately one-half of their public, domestic, and irrigation water demands. The 887-square-mile AMA, located in King and Pierce Counties, represents the area of analysis for the conceptual
By
Water Resources Mission Area, Washington Water Science Center

Airborne lidar accuracy analysis for dual photogrammetric and lidar sensor pilot project in Colorado, 2019 Airborne lidar accuracy analysis for dual photogrammetric and lidar sensor pilot project in Colorado, 2019

This report presents accuracy assessment results of the light detection and ranging (lidar) data collected in Colorado during a pilot project in fall 2019. The purpose of the pilot project was to assess the accuracy of lidar and imagery data collected simultaneously for the U.S. Department of Agriculture (USDA) National Agriculture Imagery Program and the U.S. Geological Survey National...
Authors
Aparajithan Sampath, Jeff Irwin, Minsu Kim
By
National Land Imaging Program, Earth Resources Observation and Science (EROS) Center, EROS CalVal Center of Excellence (ECCOE)

Distribution, abundance, and breeding activities of the Southwestern Willow Flycatcher at Marine Corps Base Camp Pendleton, California—2022 annual report Distribution, abundance, and breeding activities of the Southwestern Willow Flycatcher at Marine Corps Base Camp Pendleton, California—2022 annual report

Executive Summary Surveys for the endangered Southwestern Willow Flycatcher (Empidonax traillii extimus) were done at Marine Corps Base Camp Pendleton (MCBCP or “Base”), California, between May 9 and July 20, 2022. All of MCBCP’s historically occupied riparian habitat (core survey area) was surveyed for flycatchers in 2022. None of the non-core survey area was surveyed in 2022. Eight...
Authors
Scarlett L. Howell, Barbara E. Kus
By
Ecosystems Mission Area, Western Ecological Research Center (WERC)

Distribution, abundance, and breeding activities of the Southwestern Willow Flycatcher at Marine Corps Base Camp Pendleton, California—2021 annual report Distribution, abundance, and breeding activities of the Southwestern Willow Flycatcher at Marine Corps Base Camp Pendleton, California—2021 annual report

Executive Summary The purpose of this report is to provide the Marine Corps with an annual summary of abundance, breeding activity, demography, and habitat use of the endangered Southwestern Willow Flycatcher (Empidonax traillii extimus) at Marine Corps Base Camp Pendleton (MCBCP). Surveys for the flycatcher were completed at MCBCP between May 5 and July 31, 2021. All of MCBCP’s...
Authors
Scarlett L. Howell, Barbara E. Kus
By
Ecosystems Mission Area, Western Ecological Research Center (WERC)
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