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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.
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Analysis and review of fishery-dependent data for Hawaiian nearshore noncommercial fisheries Analysis and review of fishery-dependent data for Hawaiian nearshore noncommercial fisheries
Noncommercial, shore-based fisheries provide economic, social, and cultural services to communities throughout the Hawaiian Islands. The State of Hawai‘i Department of Land and Natural Resources (DLNR), Division of Aquatic Resources (DAR) routinely conducts surveys to monitor noncommercial fisheries such that estimates of fishing effort and catch by gear type can be generated and used to...
Authors
Lillian Joy Tuttle Raz, Timothy B. Grabowski, Richard Masse
Midwestern Climate Adaptation Science Center science agenda Midwestern Climate Adaptation Science Center science agenda
No abstract available.
Authors
Olivia E. LeDee
Watershed hydrology assessment for the Lower Colorado River Basin. Appendix D: RiverWare analyses Watershed hydrology assessment for the Lower Colorado River Basin. Appendix D: RiverWare analyses
RiverWare is a river system modeling tool developed by CADSWES (Center of Advanced Decision Support for Water and Environmental Systems) that allows the user to simulate complex reservoir operations and perform period-of-record analyses for different scenarios. For the InFRM hydrology studies, RiverWare is used to generate a homogeneous regulated POR by simulating the basin as if the...
Authors
David Wallace, Kara M. Watson
Watershed hydrology assessment for the Lower Colorado River Basin. Appendix A: Statistical hydrology Watershed hydrology assessment for the Lower Colorado River Basin. Appendix A: Statistical hydrology
Statistical analysis of the observational record from U.S. Geological Survey (USGS) streamgages and period of historical flow observations prior to the gage installation provides an informative means of estimating flood flow frequency. The U.S. Geological Survey contributed to the InFRM team’s efforts by performing the statistical analysis of the gaged record and authored this Appendix...
Authors
David Wallace, Kara M. Watson
Geophysical identification of potential groundwater – surface water interactions in the Bonita Peak Mining District, San Juan County, Colorado Geophysical identification of potential groundwater – surface water interactions in the Bonita Peak Mining District, San Juan County, Colorado
This report includes the results and interpretation of geophysical investigations to aid in the location, identification, and conceptual site model (CSM) development of the near surface groundwater and surface water hydrology of the Upper Cement Creek and California Gulch of the Animas Rivers within the Bonita Peak Mining Districts (BPMD). Mine influenced water (MIW) from numerous mine...
Authors
Dale D. Werkema, Neil C. Terry, Martin A. Briggs, Elizabeth Rutila, Stephen Dyment
Groundwater/surface-water interaction Groundwater/surface-water interaction
No abstract available.
Authors
Howard W. Reeves, Serban Danielescu, Elizabeth Priebe, Helen Zhang
Puget small streams monitoring program annual status report, water year 2020 Puget small streams monitoring program annual status report, water year 2020
This status report summarizes data collection from Summer 2020 for the Stormwater Action Monitoring (SAM) project.
Authors
Rich W. Sheibley
Glacier National Park bumble bee survey report 2023 Glacier National Park bumble bee survey report 2023
Glacier National Park's grasslands provide important contributions to the character and ecology of the park. In 1999-2001, Glacier National Park (hereafter, the park) established 155 permanent vegetation monitoring plots to inventory grassland vegetation communities east of the Continental Divide. In June of 2023, the Blackfeet Nation (Amskapi Piikuni) re-introduced a herd of free...
Authors
Lindsay Marie Dose, Erica Sanderleaf Sarro Gustilo, Tabitha A. Graves
Evaluation of fish passage for assessment of invasive carp deterrents at locks in the upper Mississippi River Evaluation of fish passage for assessment of invasive carp deterrents at locks in the upper Mississippi River
No abstract available.
Authors
Andrea K. Fritts, James T. Lamer, Joshua Abner, Mark W. Fritts, Mark Cornish, Marybeth K. Brey
A characterization of the deep-sea coral and sponge community along the Oregon Coast using a remotely operated vehicle on the EXPRESS 2022 expedition A characterization of the deep-sea coral and sponge community along the Oregon Coast using a remotely operated vehicle on the EXPRESS 2022 expedition
Deep-sea coral and sponge (DSCS) communities serve as essential fish habitat (EFH) by providing shelter and nursery habitat, increasing diversity, and increasing prey availability (Freese and Wing, 2003; Bright, 2007; Baillon et al., 2012; Henderson et al., 2020). Off the U.S. West Coast, threats to these long-lived, fragile organisms from bottom contact fishing gear, potential offshore...
Authors
Tom Laidig, Diana Watters, Meredith Everett, Nancy G. Prouty, Elizabeth Clarke
Overview of the Cenozoic geology of the northern Harrat Rahat volcanic field, Kingdom of Saudi Arabia Overview of the Cenozoic geology of the northern Harrat Rahat volcanic field, Kingdom of Saudi Arabia
The Harrat Rahat volcanic field, located in the west-central part of the Kingdom of Saudi Arabia, is one of the larger Cenozoic harrats among the more than 17 harrats situated upon the Arabia Plate. The map plate contained herein shows, at a scale of 1:100,000, the mapped volcanic geology of northern Harrat Rahat, which consists of the northernmost one-fifth of Harrat Rahat. Northern...
Authors
Joel E. Robinson, Drew T. Downs
Probabilistic seismic-hazard analysis for the western Kingdom of Saudi Arabia Probabilistic seismic-hazard analysis for the western Kingdom of Saudi Arabia
We present a probabilistic seismic-hazard analysis (PSHA) for the west-central part of the Arabian Peninsula. Our study area includes the northern Harrat Rahat volcanic field and the nearby city of Al Madīnah, Kingdom of Saudi Arabia. This young, active volcanic field experienced one historical eruption in 1256 C.E. (654 in the year of the Hijra) that vented 20 to 22 kilometers (km)...
Authors
Ryota Kiuchi, Walter D. Mooney, Hani M. Zahran