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.
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Simulation of monthly mean and monthly base flow of streamflow using random forests for the Mississippi River Alluvial Plain, 1901 to 2018 Simulation of monthly mean and monthly base flow of streamflow using random forests for the Mississippi River Alluvial Plain, 1901 to 2018
Improved simulations of streamflow and base flow for selected sites within and adjacent to the Mississippi River Alluvial Plain area are important for modeling groundwater flow because surface-water flows have a substantial effect on groundwater levels. One method for simulating streamflow and base flow, random forest (RF) models, was developed from the data at gaged sites and, in turn...
Authors
Benjamin J. Dietsch, William H. Asquith, Brian Breaker, Stephen M. Westenbroek, Wade H. Kress
Status and trends in the Lake Superior fish community, 2022 Status and trends in the Lake Superior fish community, 2022
In 2022, the Lake Superior fish community was sampled with daytime bottom and surface trawls at 71 nearshore locations in May-June and 35 offshore locations in July, and at 51 Coordinated Science and Monitoring Initiative (CSMI) locations in July-October with bottom trawls, surface trawls, mid-water trawls and acoustics that were previously sampled in 2011 and 2016. Nearshore bottom...
Authors
Mark R. Vinson, Daniel L. Yule, Lori M. Evrard, Sydney B Phillips
Central Beaufort Sea Wave and Hydrodynamic Modeling Study; Report 2: Modeled waves, hydrodynamics, and sediment transport within Foggy Island Bay Central Beaufort Sea Wave and Hydrodynamic Modeling Study; Report 2: Modeled waves, hydrodynamics, and sediment transport within Foggy Island Bay
Renewed interest in nearshore oil exploration and production in the shallow waters of the Central Beaufort Sea Shelf has created a need to advance our understanding of the past, current, and future atmospheric and oceanographic conditions that affect existing and planned infrastructure and nearshore ecosystems. At the time of writing this report, Hilcorp Alaska LLC has received BOEM...
Authors
Li H. Erikson, Cornelis M. Nederhoff, Anita C Engelstad, Jeremy L. Kasper, Peter A. Bieniek
Northern Sea Otter (Enhydra lutris kenyoni) population abundance and distribution across the southeast Alaska stock, summer 2022 Northern Sea Otter (Enhydra lutris kenyoni) population abundance and distribution across the southeast Alaska stock, summer 2022
In the summer of 2022, the U.S. Fish & Wildlife Service and partners successfully completed the first single-year, aerial photo survey of sea otters across the entire Southeast stock of northern sea otters. This document presents the latest findings from the 2022 Southeast Alaska Sea Otter Survey, providing up-to-date information regarding occupancy, abundance and carrying capacity. We...
Authors
Paul Schuette, Joseph Michael Eisaguirre, Benjamin P Weitzman, Collin Power, Evan Wetherington, Jenipher Cate, Jamie N. Womble, Linnea Pearson, Daniel Melody, Chelsea Merriman, Kat Hanks, George G. Esslinger
Decision making for Centennial Valley Arctic Grayling conservation on Red Rocks Lake National Wildlife Refuge Decision making for Centennial Valley Arctic Grayling conservation on Red Rocks Lake National Wildlife Refuge
This report describes a decision analysis process that was conducted in support of a U.S. Fish and Wildlife Service Environmental Assessment on Arctic grayling (Thymallus arcticus) on Red Rocks Lake National Wildlife Refuge in the Centennial Valley, Montana.
Authors
Jonathan D. Cook, Kyle Flynn, Donovan A. Bell, Matthew E. Jaeger, Jeff Warren, Ryan Kreiner, Jarrett Payne, Jaron Andrews, Andrew Brummond, Evan H. Campbell Grant, Sarah Nelson Sells
Results of validation exercise for Marine Benthic Index Results of validation exercise for Marine Benthic Index
Marine benthic invertebrates (benthos) are key components of the Puget Sound ecosystem. Because of their direct association living in, and sometimes consuming, sediments, benthos can be valuable sentinels of ecosystem health. Therefore, indicators of benthic invertebrate community health can serve as direct measures of sediment and water quality. In 2021, the Puget Sound Partnership...
Authors
Valerie Partridge, Donald Schoolmaster