Physical Sciences and Mathematics Commons^™

Age And Quality Of Ground Water And Sources Of Nitrogen In The Surficial Aquifers In Pumpkin Creek Valley, Western Nebraska, 2000, G. V. Steele, J. C. Cannia, S. S. Sibray, V. L. Mcguire

Publications of the US Geological Survey

Ground water is the source of drinking water for the residents of Pumpkin Creek Valley, western Nebraska. In this largely agricultural area, shallow aquifers potentially are susceptible to nitrate contamination. During the last 10 years, ground-water levels in the North Platte Natural Resources District have declined and contamination has become a major problem for the district. In 2000, the U.S. Geological Survey and the North Platte Natural Resources District began a cooperative study to determine the age and quality of the ground water and the sources of nitrogen in the aquifers in Pumpkin Creek Valley.

Water samples were collected from …

Comparison Of Preconstruction And 2003 Bathymetric And Topographic Surveys Of Lake Mcconaughy, Nebraska, W. H. Kress, S. K. Sebree, G. R. Littin, M. A. Drain, M. E. Kling

Publications of the US Geological Survey

The U.S. Geological Survey, in cooperation with The Central Nebraska Public Power and Irrigation District, conducted a study that used bathymetric and topographic surveying in conjunction with Geographical Information Systems techniques to determine the 2003 physical shape, current storage capacity, and the changes in storage capacity of Lake McConaughy that have occurred over the past 62 years. By combining the bathymetric and topographic survey data, the current surface area of Lake McConaughy was determined to be 30,413.0 acres, with a volume of 1,756,300 acre-feet at the lake conservation-pool elevation of 3,266.4 feet above North American Vertical Datum of 1988 (3,265.0 …

Geologic Map And Topographic Profile Of The Newark Quadrangle, Nebraska, Steven M. Condon

Publications of the US Geological Survey

Newark Quadrangle, Nebraska

Mercury Concentrations In Fishes From Select Water Bodies In Trinity County, California, 2000-2002, Jason T. May, Roger L. Hothem, Charles N. Alpers

Publications of the US Geological Survey

Sites of historical gold and mercury mining in the Trinity River watershed continue to release mercury to downstream water bodies. To evaluate the extent of mercury (Hg) contamination in the watershed, the U.S. Geological Survey collected samples of sediment, water, invertebrates, amphibians, and fishes from select water bodies and mine sites in Trinity County, California. This report presents total mercury data for 368 fishes collected during 2000–2002, from 4 locations within Trinity Lake, from 16 stream sites, and from 3 pond sites within the Trinity River watershed. The following species of fish were sampled (scientific name and number of samples …

Contaminant Concentrations And Biomarker Responses Of Fish From The Mobile, Apalachicola, Savannah, And Pee Dee River Basins, Jo Ellen Hinck, V. S. Blazer, N. D. Denslow, T. S. Gross, T. W. May, C. E. Orazio, J. J. Coyle, P. J. Anderson, D. E. Tillitt

Publications of the US Geological Survey

No abstract provided.

Geologic Map And Topographic Profile Of The Elm Creek West Quadrangle, Nebraska, Steven M. Condon

Publications of the US Geological Survey

Geologic Map and Topographic Profile of the Elm Creek West Quadrangle, Nebraska

Questa Baseline And Pre-Mining Ground- Water Quality Investigation. 5. Well Installation, Water-Level Data, And Surface- And Ground-Water Geochemistry In The Straight Creek Drainage Basin, Red River Valley, New Mexico, 2001-03, Cheryl A. Naus, R. Blaine Mccleskey, D. Kirk Nordstrom, Lisa C. Donohoe, Andrew G. Hunt, Frederick L. Paillet, Roger H. Morin, Phillip L. Verplanck

Publications of the US Geological Survey

The U.S. Geological Survey, in cooperation with the New Mexico Environment Department, is investigating the pre-mining ground-water chemistry at the Molycorp molybdenum mine in the Red River Valley, northern New Mexico. The primary approach is to determine the processes controlling groundwater chemistry at an unmined, off-site, proximal analog. The Straight Creek drainage basin, chosen for this purpose, consists of the same quartz-sericite-pyrite altered andesitic and rhyolitic volcanic rock of Tertiary age as the mine site. The weathered and rugged volcanic bedrock surface is overlain by heterogeneous debris-flow deposits that interfinger with alluvial deposits near the confluence of Straight Creek and …

Amphibian Research And Monitoring Initiative: Concepts And Implementation, Paul Stephen Corn, Michael J. Adams, William A. Battaglin, Alisa L. Gallant, Daniel L. James, Melinda Knutson, Catherine A. Langtimm, John R. Sauer

Publications of the US Geological Survey

This report provides the basis for discussion and subsequent articulation of a national plan for the Amphibian Research and Monitoring Initiative (ARMI). The authors were members of a task force formed from within the U.S. Geological Survey (USGS) that included scientists with expertise in biology, cartography, hydrology, and statistics. The assignment of the task force was to extend work begun by the National Amphibian Leadership Group. This group, composed of senior USGS scientists, managers, and external authorities, met in Gainesville, Florida, in February 20001. The product of this meeting was a document outlining the framework for a national program to …

Assessing Sandhill Crane Roosting Habitat Along The Platte River, Nebraska, P.J. Kinzel, J.M. Nelson, R.S. Parker

Publications of the US Geological Survey

Each spring approximately 500,000 sandhill cranes and some endangered whooping cranes use the Central Platte River Valley in Nebraska as a staging habitat during their migration north to breeding and nesting grounds in Canada, Alaska, and the Siberian Arctic. Over the last century changes in the flow of the river have altered the river channels and the distribution of roost sites. USGS researchers studied linkages between water flow, sediment supply, channel morphology, and preferred sites for crane roosting. These results are useful for estimating crane populations and for providing resource managers with techniques to understand crane habitats.

Mercury Contamination From Historical Gold Mining In California, Charles N. Alpers, Michael P. Hunerlach, Jason T. May, Roger L. Hothem

Publications of the US Geological Survey

Mercury contamination from historical gold mines represents a potential risk to human health and the environment. This fact sheet provides background information on the use of mercury in historical gold mining and processing operations in California, with emphasis on historical hydraulic mining areas. It also describes results of recent USGS projects that address the potential risks associated with mercury contamination.

Miners used mercury (quicksilver) to recover gold throughout the western United States. Gold deposits were either hardrock (lode, gold-quartz veins) or placer (alluvial, unconsolidated gravels). Underground methods (adits and shafts) were used to mine hardrock gold deposits. Hydraulic, drift, or …

Geologic Studies Of The Platte River, South-Central Nebraska And Adjacent Areas—Geologic Maps, Subsurface Study, And Geologic History, Steven M. Condon

Publications of the US Geological Survey

The Platte River of south-central Nebraska was studied at three scales to place the river in its geological context and to trace its evolution through geologic time. At the largest scale the Elm Creek West and the Newark 7.5 minute quadrangles were mapped. These quadrangles are located just west and just east of Kearney and serve to illustrate the main geomorphic elements of the present Platte River Valley. The central elements of the quadrangles are the Platte River channels, islands, and bottomlands, which are flanked by terraces that step up away from the river to the north and south. Significant …