Update on Regulation of Sand Transport in the Colorado River by Changes in the Surface Grain Size of Eddy Sandbars over Multiyear Timescales
David J. Topping, David M. Rubin, John C. Schmidt
2008, Scientific Investigations Report 2008-5042
In settings where the transport of sand is partially or fully supply limited, changes in the upstream supply of sand are coupled to changes in the grain size of sand on the bed. In this manner, the transport of sand under the supply-limited case is ?grain-size regulated.? Since the closure...
Catalog of Mount St. Helens 2004 - 2005 tephra samples with major- and trace-element geochemistry
Michael C. Rowe, Carl R. Thornber, Daniel J. Gooding, John S. Pallister
2008, Open-File Report 2008-1131
This open-file report presents a catalog of information about 135 ash samples along with geochemical analyses of bulk ash, glass and individual mineral grains from tephra deposited as a result of volcanic activity at Mount St. Helens, Washington, from October 1, 2004 until August 15, 2005. This data, in conjunction...
Helicopter Electromagnetic and Magnetic Geophysical Survey Data, Oakland, Ashland, and Firth Study Areas, Eastern Nebraska, March 2007
Bruce D. Smith, Jared D. Abraham, James C. Cannia, Gregory V. Steele, Patricia L. Hill
2008, Open-File Report 2008-1018
This report is a digital data release for a helicopter electromagnetic and magnetic survey that was conducted during March 2007 in three 93-square-kilometer (36-square-mile) areas of eastern Nebraska as part of a joint State of Nebraska and U.S. Geological Survey study. The objective of the survey is to improve the...
Preliminary integrated geologic map databases for the United States. Digital data for the geology of the southern Brooks Range, Alaska
2008, Open-File Report 2008-1149
The growth in the use of Geographic Information Systems (GIS) has highlighted the need for digital geologic maps that have been attributed with information about age and lithology. Such maps can be conveniently used to generate derivative maps for manifold special purposes such as mineral-resource assessment, metallogenic studies, tectonic studies,...
Environmental factors and flow paths related to Escherichia coli concentrations at two beaches on Lake St. Clair, Michigan, 2002–2005
David J. Holtschlag, Dawn Shively, Richard L. Whitman, Sheridan K. Haack, Lisa R. Fogarty
2008, Scientific Investigations Report 2008-5028
Regression analyses and hydrodynamic modeling were used to identify environmental factors and flow paths associated with Escherichia coli (E. coli) concentrations at Memorial and Metropolitan Beaches on Lake St. Clair in Macomb County, Mich. Lake St. Clair is part of the binational waterway between the United States and Canada that...
Catalog of Mount St. Helens 2004-2007 dome samples with major- and trace-element chemistry
Carl R. Thornber, John S. Pallister, Michael C. Rowe, Siobhan McConnell, Trystan M. Herriott, Alison Eckberg, Winston C. Stokes, Diane Johnson Cornelius, Richard M. Conrey, Tammy Hannah, Joseph E. Taggart Jr., Monique Adams, Paul J. Lamothe, James R. Budahn, Charles M. Knaack
2008, Open-File Report 2008-1130
Sampling and analysis of eruptive products at Mount St. Helens is an integral part of volcano monitoring efforts conducted by the U.S. Geological Survey?s Cascades Volcano Observatory (CVO). The objective of our eruption sampling program is to enable petrological assessments of pre-eruptive magmatic conditions, critical for ascertaining mechanisms for eruption...
Uranium in surface waters and sediments affected by historical mining in the Denver West 1:100,000 Quadrangle, Colorado
Robert A. Zielinski, James K. Otton, R. Randall Schumann, Laurie Wirt
2008, Scientific Investigations Report 2007-5246
Geochemical sampling of 82 stream waters and 87 stream sediments within mountainous areas immediately west of Denver, Colorado, was conducted by the U.S. Geological Survey in October 1994. The primary purpose was to evaluate regionally the effects of geology and past mining on the concentration and distribution of uranium. The...
Microbial and Nutrient Concentration and Load Data During Stormwater Runoff at a Swine Concentrated Animal Feeding Operation in the North Carolina Coastal Plain, 2006-2007
Stephen L. Harden
2008, Open-File Report 2008-1156
This report summarizes water-quality and hydrologic data collected during 2006-2007 to characterize bacteria and nutrient loads associated with overland runoff and subsurface tile drainage in spray fields at a swine concentrated animal feeding operation. Four monitoring locations were established at the Lizzie Research Site in the North Carolina Coastal Plain...
Rainfall-Runoff and Erosion Data from the Mancos Shale Formation in the Gunnison Gorge National Conservation Area, Southwestern Colorado, 2003-2006
John G. Elliott, James R. Herring, George P. Ingersoll, John J. Kosovich, Juli Fahy
2008, Open-File Report 2007-1002-G
Data were collected and experiments were conducted from 2003 to 2006 by the U.S. Geological Survey, in cooperation with the Bureau of Land Management, to support research into understanding processes that liberate, disperse, and concentrate erosion byproducts in Mancos Shale landscapes. The study area was the Gunnison Gorge National Conservation...
Map Showing Limits of Tahoe Glaciation in Sequoia and Kings Canyon National Parks, California
James Gregory Moore, Gregory S. Mack
2008, Scientific Investigations Map 2945
The latest periods of extensive ice cover in the Sierra Nevada include the Tahoe glaciation followed by the Tioga glaciation, and evidence for these ice ages is widespread in the Sequoia and Kings Canyon National Parks area. However, the timing of the advances and retreats of the glaciers during the...
Mobility statistics and automated hazard mapping for debris flows and rock avalanches
Julia P. Griswold, Richard M. Iverson
2008, Scientific Investigations Report 2007-5276
Power-law equations that are physically motivated and statistically tested and calibrated provide a basis for forecasting areas likely to be inundated by debris flows, rock avalanches, and lahars with diverse volumes. The equations A=α1V2/3 and B=α2V2/3 are based on the postulate that the maximum valley cross-sectional area (A) and total...
Bathymetric Survey and Storage Capacity of Upper Lake Mary near Flagstaff, Arizona
Nancy J. Hornewer, Marilyn E. Flynn
2008, Open-File Report 2008-1098
Upper Lake Mary is a preferred drinking-water source for the City of Flagstaff, Arizona. Therefore, storage capacity and sedimentation issues in Upper Lake Mary are of interest to the City. The U.S. Geological Survey, in cooperation with the City of Flagstaff, collected bathymetric and land-survey data in Upper Lake Mary...
Using Molecular Genetic Markers to Resolve a Subspecies Boundary: The Northern Boundary of the Southwestern Willow Flycatcher in the Four-Corner States
Eben H. Paxton, Mark K. Sogge, Tad C. Theimer, Jessica Girard, Paul Keim
2008, Open-File Report 2008-1117
*Executive Summary* The northern boundary of the endangered Southwestern Willow Flycatcher (Empidonax traillii extimus) is currently approximated as running through southern Colorado and Utah, but the exact placement is uncertain because this subspecies shares a border with the more northern and non-endangered E. t. adastus. To help resolve this issue, we...
Documentation of data collection in Currituck Sound, North Carolina and Virginia, 2006-2007
Jason M. Fine
2008, Open-File Report 2008-1147
During 2006 and 2007, scientists from Elizabeth City State University, North Carolina Estuarine Research Reserve, the U.S. Fish and Wildlife Service, and the U.S. Geological Survey collected hydrologic and water-quality data at nine sites in and around Currituck Sound. Hydrologic and water-quality data were collected at five tributary sites--the Northwest...
Questa baseline and pre-mining ground-water quality investigation. 25. Summary of results and baseline and pre-mining ground-water geochemistry, Red River Valley, Taos County, New Mexico, 2001-2005
D. Kirk Nordstrom
2008, Professional Paper 1728
Active and inactive mine sites are challenging to remediate because of their complexity and scale. Regulations meant to achieve environmental restoration at mine sites are equally challenging to apply for the same reasons. The goal of environmental restoration should be to restore contaminated mine sites, as closely as possible, to...
Providing Data and Modeling to Help Manage Water Supplies
James Nickles
2008, Fact Sheet 2008-3038
The Sonoma County Water Agency (SCWA) and other local water purveyors have partnered with the U.S. Geological Survey (USGS) to assess hydrologic conditions and to quan-tify the county-wide interconnections between surface water and ground water. Through this partnership, USGS scientists have completed assessments of the geohydrology and geochemistry of the Sonoma...
Multi-Disciplinary Approach to Trace Contamination of Streams and Beaches
James Nickles
2008, Fact Sheet 2008-3040
Concentrations of fecal-indicator bacteria in urban streams and ocean beaches in and around Santa Barbara occasionally can exceed public-health standards for recreation. The U.S. Geological Survey (USGS), working with the City of Santa Barbara, has used multi-disciplinary science to trace the sources of the bacteria. This research is helping local...
USGS Research Helps the County of Los Angeles Address New Arsenic Standards
James Nickles
2008, Fact Sheet 2008-3043
In January 2006, the U.S. Environmental Protection Agency (USEPA) enacted stringent standards on arsenic in drinking water. The new limitsraised concerns about wells in the Antelope Valley of northern Los Angeles County that had high levels of naturally occurring arsenic. To meet the new standard, Los Angeles County Waterworks District...
USGS Workshop on Scientific Aspects of a Long-Term Experimental Plan for Glen Canyon Dam, April 10-11, 2007, Flagstaff, Arizona
USGS Grand Canyon Monitoring and Research Center
2008, Open-File Report 2008-1153
Executive Summary Glen Canyon Dam is located in the lower reaches of Glen Canyon National Recreation Area on the Colorado River, approximately 15 miles upriver from Grand Canyon National Park (fig. 1). In 1992, Congress passed and the President signed into law the Grand Canyon Protection Act (GCPA; title XVIII, sec....
Research to More Effectively Manage Critical Ground-Water Basins
James Nickles
2008, Fact Sheet 2008-3037
As the regional management agency for two of the most heavily used ground-water basins in California, the Water Replenishment District of Southern California (WRD) plays a vital role in sheparding the water resources of southern Los Angeles County. WRD is using the results of the U.S. Geological Survey (USGS) studies...
Pacific Walrus Response to Arctic Sea Ice Losses
Chadwick V. Jay, Anthony S. Fischbach
2008, Fact Sheet 2008-3041
Sea ice plays an important role in the life of the Pacific walrus (Odobenus rosmarus divergens). U.S. Geological Survey (USGS) scientists are seeking to understand how losses of sea ice during summer over important foraging grounds in the Chukchi Sea will affect walruses. USGS scientists recently modified a remotely deployed...
NCCN Mountain Lakes Monitoring Strategy: Guidelines to Resolution
Robert L. Hoffman, Mark H. Huff
2008, Open-File Report 2008-1145
The North Coast and Cascades Network (NCCN) Inventory and Monitoring Program provides funds to its Network Parks to plan and implement the goals and objectives of the National Park Services? (NPS) Inventory and Monitoring (I&M) Program. The primary purpose of the I&M program is to develop and implement a long-term...
Table Mountain Shoshonite Porphyry Lava Flows and Their Vents, Golden, Colorado
Harald Drewes
2008, Scientific Investigations Report 2006-5242
During early Paleocene time shoshonite porphyry lava was extruded from several plugs about 5 km north of Golden, Colo., to form lava flows intercalated in the upper part of the Denver Formation. These flows now form the caps of North and South Table Mountains. Detailed field and petrographic studies provide...
Streamflow Characteristics of Streams in the Helmand Basin, Afghanistan
Tara Williams-Sether
2008, Data Series 333
Statistical summaries of streamflow data for all historical streamflow-gaging stations for the Helmand Basin upstream from the Sistan Wetlands are presented in this report. The summaries for each streamflow-gaging station include (1) manuscript (station description), (2) graph of the annual mean discharge for the period of record, (3) statistics of...
Preliminary Map of Potentially Karstic Carbonate Rocks in the Central and Southern Appalachian States
David J. Weary
2008, Open-File Report 2008-1154
Karst is a landscape produced by dissolution of rocks and the development of integrated subterranean drainages dominated by the flow of ground water in solutionally enlarged conduits. Karst landscapes typically include cave entrances, sinkholes, blind valleys, losing streams, springs, and large and small-scale solution features on bedrock surfaces. Water-bearing rocks...
