Mercury bioaccumulation in fish in a region affected by historic gold mining: The South Yuba River, Deer Creek, and Bear River watersheds, California, 1999
Jason T. May, Roger L. Hothem, Charles N. Alpers, Matthew A. Law
2000, Open-File Report 2000-367
Mercury that was used historically for gold recovery in mining areas of the Sierra Nevada continues to enter local and downstream water bodies, including the Sacramento Delta and the San Francisco Bay of northern California. Methylmercury is of particular concern because it is the most prevalent form of mercury in...
Pesticides in surface waters of the upper Colorado River basin, Colorado, 1996-98
Nancy J. Bauch, Norman E. Spahr
2000, Water-Resources Investigations Report 2000-4005
Forty-four river, stream, and drain sites in the Upper Colorado River Basin in Colorado were sampled during 1996?98 to determine the occurrence and distribution of pesticides in the basin. In a fixed-station study, 57 surface-water samples were collected from October 1996 through January 1998 at four sites. Each site was...
Sustainable-yield estimation for the Sparta Aquifer in Union County, Arkansas
Phillip D. Hays
2000, Water-Resources Investigations Report 99-4274
Options for utilizing alternative sources of water to alleviate overdraft from the Sparta aquifer and ensure that the aquifer can continue to provide abundant water of excellent quality for the future are being evaluated by water managers in Union County. Sustainable yield is a critical element in identifying and designing...
Rock-fall hazard assessment of the Aspen Forest Trail, Navajo National Monument, Arizona
Gerald F. Wieczorek, Edwin L. Harp
2000, Open-File Report 2000-305
Status of water levels and selected water-quality conditions in the Sparta and Memphis aquifers in eastern and south-central Arkansas, 1999
Robert L. Joseph
2000, Water-Resources Investigations Report 2000-4009
During the spring of 1999, water levels were measured in the Sparta and Memphis aquifers in 321 wells in eastern and south-central Arkansas. Water samples were collected during the spring and summer of 1999 from wells completed in these aquifers. The specific conductance of the ground water was measured from...
Arsenic in ground water in Sanilac County, Michigan
Sheridan K. Haack, Cynthia M. Rachol
2000, Fact Sheet 132-00
Previous studies of ground-water resources in Michigan by the Michigan Department of Community Health (MDCH), the Michigan Department of Environmental Quality (MDEQ), and the U.S. Geological Survey (USGS) indicate that in several counties in the southeastern part of the State the concentrations of arsenic in ground water may exceed the...
Arsenic in ground water in Washtenaw County, Michigan
Sheridan K. Haack, Cynthia M. Rachol
2000, Fact Sheet 134-00
Previous studies of ground-water resources in Michigan by the Michigan Department of Community Health (MDCH), the Michigan Department of Environmental Quality (MDEQ), and the U.S. Geological Survey (USGS) indicate that in several counties in the southeastern part of the State the concentrations of arsenic in ground water may exceed the...
Water quality in the eastern Iowa basins, Iowa and Minnesota, 1996-98
Stephen J. Kalkhoff, Kimberlee K. Barnes, Kent Becher, Mark E. Savoca, Douglas J. Schnoebelen, Eric M. Sadorf, Stephen D. Porter, Daniel J. Sullivan
2000, Circular 1210
The water quality in rivers and streams and in selected aquifers in eastern Iowa and part of southern Minnesota is described and illustrated. Major ions, nitrogen and other nutrients, and pesticides and some of their breakdown compounds were analyzed in both surface and ground water. Biological communities that included fish,...
Water quality in the upper Mississippi River basin, Minnesota, Wisconsin, South Dakota, Iowa, and North Dakota, 1995-98
James R. Stark, P. E. Hanson, R. M. Goldstein, J. D. Fallon, A. L. Fong, K. E. Lee, S. E. Kroening, W. J. Andrews
2000, Circular 1211
The report summarizes major findings about water quality in part of the upper Mississippi River basin that emerged from an assessment conducted from 1995 to 1998 by the NAWQA Program. Water quality is discussed in terms of local and regional issues and compared to conditions in the other 36 NAWQA...
Water quality in the central Arizona basins, Arizona, 1995-98
Gail E. Cordy, Dorinda J. Gellenbeck, Joseph B. Gebler, David W. Anning, Alissa L. Coes, Robert J. Edmonds, Julie A.H. Rees, H. W. Sanger
2000, Circular 1213
The water quality in rivers and streams and in selected aquifers in central Arizona basins in Arizona is described and illustrated. Major ions, nitrogen and other nutrients, and pesticides and some of their breakdown compounds were analyzed in both surface and ground water. Biological communities that included fish, invertebrates, and...
Aquifer-system compaction and land subsidence: Measurements, analyses, and simulations – The Holly Site, Edwards Air Force Base, Antelope Valley, California
Michelle Sneed, Devin L. Galloway
2000, Water-Resources Investigations Report 2000-4015
Land subsidence resulting from ground-water-level declines has long been recognized as a problem in Antelope Valley, California. At Edwards Air Force Base (EAFB), ground-water extractions have caused more than 150 feet of water-level decline, resulting in nearly 4 feet of subsidence. Differential land subsidence has caused sinklike depressions and earth...
Geothermal hydrology of Valles Caldera and the southwestern Jemez Mountains, New Mexico
Frank W. Trainer, Robert J. Rogers, M.L. Sorey
2000, Water-Resources Investigations Report 2000-4067
The Jemez Mountains in north-central New Mexico are volcanic in origin and have a large central caldera known as Valles Caldera. The mountains contain the Valles geothermal system, which was investigated during 1970-82 as a source of geothermal energy. This report describes the geothermal hydrology of the Jemez Mountains and...
Selected organic compounds and trace elements in streambed sediments and fish tissues, Cook Inlet Basin, Alaska
Steven A. Frenzel
2000, Water-Resources Investigations Report 2000-4004
Organochlorines, semivolatile organic compounds (SVOCs), and trace elements were investigated in streambed sediments and fish tissues at selected sites in the Cook Inlet Basin, Alaska, during 1998. At most sites, SVOCs and organochlorine compounds were either not detected or detected at very low concentrations. Chester Creek at Arctic Boulevard at...
Microbiological monitoring for the U.S. Geological Survey National Water-Quality Assessment Program
Donna S. Francy, Donna N. Myers, Dennis R. Helsel
2000, Water-Resources Investigations Report 2000-4018
Data to characterize the microbiological quality of the Nation's fresh, marine, and estuarine waters are usually collected for local purposes, most often to judge compliance with standards for protection of public health in swimmable or drinkable waters. Methods and procedures vary with the objectives and practices of the parties collecting...
Aquifer compaction and ground-water levels in south-central Arizona
Daniel W. Evans, Donald R. Pool
2000, Water-Resources Investigations Report 99-4249
As of 1998, the U.S. Geological Survey is monitoring water-level fluctuationa dn aquifer compaction at 19 wells that are fitted with borehole extensometers in the Eloy Basin, Stanfield Basin, Avra Valley, and Upper Santa Cruz Basin. Decreased ground-water pumping has resulted in water-level recoveries of more than 100 feet at...
Distribution of nitrate in ground water in the Republican River Basin, southwest Nebraska, 1996-98
Jennifer S. Stanton
2000, Water-Resources Investigations Report 2000-4056
Assessment of sedimentation in Crowders Creek, York County, South Carolina, 1999-2000
Douglas D. Nagle
2000, Open-File Report 2000-378
Sedimentation in Crowders Creek cove in Lake Wylie, located in York County, South Carolina, has restricted boat navigation and made a boat ramp unusable. To provide baseline information, the U.S. Geological Survey, in cooperation with the York County Council, collected bathymetric and bed-sediment data in the cove, and streamflow and...
Yellowstone plume head: Postulated tectonic relations to the Vancouver Slab, continental boundaries, and climate
Kenneth Lee Pierce, Lisa A. Morgan, Richard W. Saltus
2000, Open-File Report 2000-498
No abstract available....
Phanerozoic tectonic evolution of the Circum-North Pacific
Warren J. Nokleberg, Leonid M. Parfenov, James W.H. Monger, Ian O. Norton, Alexander I. Khanchuk, David B. Stone, Christopher R. Scotese, David W. Scholl, Kazuya Fujita
2000, Professional Paper 1626
The Phanerozoic tectonic evolution of the Circum-North Pacific is recorded mainly in the orogenic collages of the Circum-North Pacific mountain belts that separate the North Pacific from the eastern part of the North Asian Craton and the western part of the North American Craton. These collages consist of tectonostratigraphic terranes...
Quality assurance and analysis of water levels in wells on Pahute Mesa and vicinity, Nevada Test Site, Nye County, Nevada
Joseph M. Fenelon
2000, Water-Resources Investigations Report 2000-4014
Periodic and continual water-level data from 1963 to 1998 were compiled and quality assured for 65 observation wells on Pahute Mesa and vicinity, Nye County, Nevada. As part of the quality assurance of all water levels, ancillary data pertinent to computing hydraulic heads in wells were compiled and analyzed. Quality-assured...
Geophysical constraints on the Virgin River Depression, Nevada, Utah, and Arizona
Victoria E. Langenheim, J. M. Glen, R.C. Jachens, G. L. Dixon, T.C. Katzer, R. L. Morin
2000, Open-File Report 2000-407
Gravity and aeromagnetic data provide insights into the subsurface lithology and structure of the Virgin River Depression (VRD) of Nevada, Utah, and Arizona. The gravity data indicate that the Quaternary and Tertiary sedimentary deposits hide a complex pre-Cenozoic surface. A north-northwest-trending basement ridge separates the Mesquite and Mormon basins, as...
Summary information about platinum-group elements and other trace metals in greenstones of the Wrangellia Terrane and the Gravina Belt, southeastern Alaska
Arthur B. Ford, David A. Brew
2000, Open-File Report 2000-256
Computed roughness coefficients for Skunk Creek above Interstate 17, Maricopa County, Arizona
Christie M. O’Day, Jeff V. Phillips
2000, Water-Resources Investigations Report 99-4248
In the winter of 1997-98, the U.S. Geological Survey, in cooperation with the Flood Control District of Maricopa County, made six verification measurements for Manning's roughness coefficients at Skunk Creek above Interstate 17. Data from four floodflows were recorded and analyzed, three of these flows occurred in February 1998 when...
Conceptual evaluation of ground-water flow and simulated effects of changing irrigation practices on the shallow aquifer in the Fallon and Stillwater areas, Churchill County, Nevada
Nora Berggren Herrera, R. L. Seiler, David E. Prudic
2000, Water-Resources Investigations Report 99-4191
High-streamflow statistics of selected streams in the Red River of the North basin, North Dakota, Minnesota, South Dakota, and Manitoba
Tara Williams-Sether
2000, Open-File Report 2000-344
Statistical summaries of high-streamflow data through water year 1997 for selected active U.S. Geological Survey gaging stations for the Red River of the North Basin upstream of and including Emerson, Manitoba, but excluding the Devils Lake Basin, are presented in this report. The summaries for each streamflow-gaging station include (1)...
