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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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Simulation of groundwater flow in the Long Island, New York regional aquifer system for pumping and recharge conditions from 1900 to 2019 Simulation of groundwater flow in the Long Island, New York regional aquifer system for pumping and recharge conditions from 1900 to 2019
The U.S. Geological Survey has developed a transient, groundwater-flow model that simulates hydrologic conditions in the Long Island aquifer system as part of an ongoing (since 2016) multiyear, cooperative investigation with the New York State Department of Environmental Conservation. The goals of this investigation are to assist stakeholders and resource managers to evaluate the...
Authors
Donald A. Walter, Kalle Jahn, John P. Masterson, Sarken E. Dressler, Jason S. Finkelstein, Monti
Hydrogeologic conceptual model of groundwater occurrence and brine discharge to the Dolores River in the Paradox Valley, Montrose County, Colorado Hydrogeologic conceptual model of groundwater occurrence and brine discharge to the Dolores River in the Paradox Valley, Montrose County, Colorado
Salinity, or total dissolved solids (TDS), of the Colorado River is a major concern in the southwestern United States where the river provides water to about 40 million people for municipal and industrial use and is used to irrigate about 5.5 million acres of land. Much of the salinity in the Colorado River Basin is derived from natural interactions of surface water and groundwater with...
Authors
Suzanne S. Paschke, M. Alisa Mast, Philip M. Gardner, Connor P. Newman, Kenneth R. Watts
Simulation of groundwater flow and brine discharge to the Dolores River in the Paradox Valley, Montrose County, Colorado Simulation of groundwater flow and brine discharge to the Dolores River in the Paradox Valley, Montrose County, Colorado
Salinity, or total dissolved solids (TDS), of the Colorado River affects agricultural, municipal, and industrial water users and is an important concern in the Western United States. In the Paradox Valley of southwestern Colorado, natural discharge of sodium-chloride brine to the Dolores River from the underlying core of a salt-valley anticline accounts for about 6 percent of the...
Authors
Charles E. Heywood, Suzanne S. Paschke, M. Alisa Mast, Kenneth R Watts
Report of the River Master of the Delaware River for the period December 1, 2016–November 30, 2017 Report of the River Master of the Delaware River for the period December 1, 2016–November 30, 2017
Executive Summary A Decree of the Supreme Court of the United States, entered June 7, 1954 (New Jersey v. New York, 347 U.S. 995), established the position of Delaware River Master within the U.S. Geological Survey. In addition, the Decree authorizes the diversion of water from the Delaware River Basin and requires compensating releases from certain reservoirs owned by New York City be...
Authors
Kendra L. Russell, William J. Andrews, Vincent J. DiFrenna, J. Michael Norris, Robert R. Mason,
Least Bell's Vireos and Southwestern Willow Flycatchers—Breeding activities and habitat use—2023 annual report Least Bell's Vireos and Southwestern Willow Flycatchers—Breeding activities and habitat use—2023 annual report
Executive Summary We completed four protocol surveys for Least Bell’s Vireos (Vireo bellii pusillus; hereinafter vireo) during the breeding season, supplemented by weekly territory monitoring visits between April 6 and July 20 at the San Luis Rey Flood Risk Management Project Area (hereinafter Project Area). We identified a total of 136 territorial male vireos; 121 were confirmed as...
Authors
Alexandra Houston, Lisa D. Allen, Shannon M. Mendia, Barbara E. Kus
Water-quality constituent concentrations and loads computed using real-time water-quality data for the Republican River, Clay Center, Kansas, August 2018 through July 2023 Water-quality constituent concentrations and loads computed using real-time water-quality data for the Republican River, Clay Center, Kansas, August 2018 through July 2023
Milford Lake, the largest reservoir by surface area in Kansas, has had confirmed harmful algal blooms every summer since reporting began in 2011, except 2018–19. Milford Lake has been listed as impaired and designated hypereutrophic under section 303(d) of the 1972 Clean Water Act. In 2014, the Kansas Department of Health and Environment established a total maximum daily load for...
Authors
Ariele R. Kramer, Justin R. Abel