Search USGS⌕ Search

Geology topics

Research about Idaho

Source-linked reports with geographic coverage including Idaho.

At least 613 records · Page 34Linked to original sources
USGS1996

Nutrient and trace-element enrichment of Coeur d'Alene Lake, Idaho

The limnological characteristics and geochemistry of lakebed sediments in Coeur d'Alene Lake, a 129-square-kilometer, natural lake in northern Idaho, were assessed during 1991-92 because of the possible interaction of nutrient enrichment with the highly enriched trace-element concentrations stored in the lakebed. The lake was classified as oligotrophic during 1991-92 on the basis of annual geometric mean concentrations, in micrograms per liter, of total phosphorus (4.1), total nitrogen (247), and chlorophyll-a (0.54). Despite its oligotrophy, the lake developed a substantial hypolimnetic dissolved-oxygen deficit in both years during the later stage of thermal stratification. The lake's current trophic state of oligotrophic differs from the mesotrophic ranking it received in 1975 during the National Eutrophication Survey. The shift in trophic state was consistent with nutrient-load reductions that have occurred within the lake's 9,690-square-kilometer drainage basin since the early 1970's. Approximately 85 percent of the lakebed's surface area was highly enriched in antimony, arsenic, cadmium, lead, mercury, silver, and zinc. Mean total concentrations, in milligrams per kilogram, for cadmium, lead, and zinc in the enriched lakebed sediments were, respectively, 62, 1,900, and 3,600. In contrast, the concentrations of cadmium, lead, and zinc in unenriched lakebed sediments in the lake's southern end were, respec- tively, 2.8, 24, and 110 milligrams per kilogram. The vast majority of the trace elements in the surficial and subsurface sediments were associated with ferric oxides, not sulfides as previously postulated. Under reducing conditions, such as within as anoxic hypolimnon, the ferric oxide- associated trace elements would be readily soluble and available for release into the overlying water column. (USGS)

Idaho↗
USGS1996

Quality-assurance plan for water-resources activities of the U.S. Geological Survey in Idaho

To ensure continued confidence in its products, the Water Resources Division of the U.S. Geological Survey implemented a policy that all its scientific work be performed in accordance with a centrally managed quality-assurance program. This report establishes and documents a formal policy for current (1995) quality assurance within the Idaho District of the U.S. Geological Survey. Quality assurance is formalized by describing district organization and operational responsibilities, documenting the district quality-assurance policies, and describing district functions. The districts conducts its work through offices in Boise, Idaho Falls, Twin Falls, Sandpoint, and at the Idaho National Engineering Laboratory. Data-collection programs and interpretive studies are conducted by two operating units, and operational and technical assistance is provided by three support units: (1) Administrative Services advisors provide guidance on various personnel issues and budget functions, (2) computer and reports advisors provide guidance in their fields, and (3) discipline specialists provide technical advice and assistance to the district and to chiefs of various projects. The district's quality-assurance plan is based on an overall policy that provides a framework for defining the precision and accuracy of collected data. The plan is supported by a series of quality-assurance policy statements that describe responsibilities for specific operations in the district's program. The operations are program planning; project planning; project implementation; review and remediation; data collection; equipment calibration and maintenance; data processing and storage; data analysis, synthesis, and interpretation; report preparation and processing; and training. Activities of the district are systematically conducted under a hierarchy of supervision an management that is designed to ensure conformance with Water Resources Division goals quality assurance. The district quality-assurance plan does not describe detailed technical activities that are commonly termed "quality-control procedures." Instead, it focuses on current policies, operations, and responsibilities that are implemented at the management level. Contents of the plan will be reviewed annually and updated as programs and operations change.

Idaho↗
USGS1996

Selected geohydrologic data from a regional aquifer-system analysis of the Northern Rocky Mountains intermontane basins in Idaho

The U.S. Geological Survey began a regional aquifer-system analysis of the Northern Rocky Mountains of northern and central Idaho and western Montana in 1990. The analysis helped establish a regional framework of information for aquifers in about 70 ntermontane basins in an area of 80,000 square miles. In many areas, ground water is the only suitable source of supply, yet little information is available about this resource. Selected geohydrologic data from 1,004 wells in 19 intermontane basins in Idaho were compiled as part of the regional analysis. Data consist of basin name and well number, altitude of land surface, date of well construction, geologic unit, depth of well, diameter of casing, type of finish, top of open interval, primary use of water, date of water level measurement, water level, discharge, specific capacity, source of discharge data, type of log available, date of water-quality constituent measurement, specific conductance, pH, and temperature. A similar report for intermontane basins in Montana has been published by the U.S. Geologcial Survey in Montana. (USGS)

Idaho↗
USGS1996

Water resources data, Idaho, water year 1995. Volume 1. Great Basin and Snake River Basin above King Hill

Water resources data for the 1995 water year for Idaho consists of records of stage, discharge, and water quality of streams; stage, contents, and water quality of lakes and reservoirs; discharge of irrigation diversions; and water levels and water quality of groundwater. The two volumes of this report contain discharge records for 191 stream-gaging stations and 36 irrigation diversions; stage only records for 4 stream-gaging stations; stage only for 9 lakes and reservoirs; contents only for 23 lakes and reservoirs; water-quality for 104 stream-gaging stations and partial record sites, 430 wells; daily totals for 1 precipitation gage; and water levels for 553 observation wells. Additional water data were collected at various sites not involved in the systematic data collection program and are published as miscellaneous measurements. These data represent that part of the National Water Data System operated by the U.S. Geological Survey and cooperating State and Federal agencies in Idaho, adjacent States, and Canada.

Idaho↗
USGS1996

Water resources data, Idaho, water year 1995: Volume 2. Upper Columbia River Basin and Snake River Basin below King Hill

Water resources data for the 1995 water year for Idaho consists of records of stage, discharge, and water quality of streams;stage, contents, and water quality of lakes and reservoirs; discharge of irrigation diversions; and water levels and waterquality of groundwater. The two volumes of this report contain discharge records for 191 stream-gaging stations and 36irrigation diversions; stage only records for 4 stream-gaging stations; stage only for 9 lakes and reservoirs; contents only for23 lakes and reservoirs; water-quality for 104 stream-gaging stations and partial record sites, 430 wells; daily totals for liprecipitation gage; and water levels for 553 observation wells. Additional water data were collected at various sites notinvolved in the systematic data collection program and are published as miscellaneous measurements. These data representthat part of the National Water Data System operated by the U.S. Geological Survey and cooperating State and Federalagencies in Idaho, adjacent States, and Canada.

Idaho↗
USGS1996

Statistical summaries of streamflow data for selected gaging stations in Idaho and adjacent states through September 1990 - Volume 1: Gaging stations with 10 or more years of record

This volume presents statistical summaries of streamflow data for 257 gaging stations with 10 or more years of continuous record through September 1990. The gaging stations are located in Idaho and adjacent States. Volume 2 presents statistical summaries of streamflow data for 76 gaging stations with 5 to 9 years of continuous record, or with records of discharge measurements from springs, through September 1990. The gaging stations are located in Idaho and western Wyoming. Streamflow statistics generated for gaging stations with 10 or more years of record were (1) magnitudes of monthly and annual flows; (2) magnitudes and frequencies of daily low, high, instantaneous peak (flood frequency), and annual mean flows; (3) duration of daily mean flows; and (4) maximum, median, and minimum daily mean flows. Streamflow statistics generated for gaging stations with 5 to 9 years of record or that measure discharge from springs (volume 2) were (1) magnitudes of monthly and annual flows; (2) duration of daily mean flows; and (3) maximum, median, and minimum daily mean flows.

Idaho↗
USGS1995

Accumulation in and effects of lead and cadmium on waterfowl and passerines in northern Idaho

Waterfowl and passerines in northern Idaho in 1987 had high levels of lead in their blood and tissues that originated primarily from mining and smelting activities. Four Canada geese ( Branta canadensis ) and one common goldeneye ( Bucephala clangula ) found dead contained 8 to 38 μg/g (wet mass) of lead in their livers. These levels exceed the lower lethal limit of 5 μg/g in experimental birds. Two of the Canada geese (one each from the contaminated and reference areas) died with ingested lead shotgun pellets (shot) in their gizzards, whereas the other three birds from the contaminated area contained no ingested shot and evidently died from ingesting environmental lead in sediment or biota. Lead burdens in most American robins ( Turdus migratorius ) and mallards ( Anas platyrhynchos ) were high, whereas those in tree swallows ( Tachycineta bicolor ) were slightly elevated. Lead accumulated to potentially hazardous levels in blood and tissues of some nestling robins (maxima of 0·87 μg/g in blood and 5·6 μg/g in liver) and mallards (maxima of 10·2 μg/g in blood and 2·8 μg/g in liver). In mallards, lead levels and associated physiological characteristics of blood were significantly different in juveniles (HY) versus adults (AHY). Activity of δ-aminolevulinic acid dehydratase (ALAD) was about 87 to 95% lower than values for control birds in experimental studies. Activity of ALAD was significantly inversely correlated with blood lead levels. Cadmium was detected in kidneys of most birds, but even the maximum concentration of 7·5 μg/g in an AHY mallard was below known harmful levels.

Idaho↗
USGS1995

Map showing geologic terranes of the Hailey 1°x2° quadrangle and the western part of the Idaho Falls 1°x2° quadrangle, south-central Idaho

The paper version of Map Showing Geologic Terranes of the Hailey 1x2 Quadrangle and the western part of the Idaho Falls 1x2 Quadrangle, south-central Idaho was compiled by Ron Worl and Kate Johnson in 1995. The plate was compiled on a 1:250,000 scale topographic base map. TechniGraphic System, Inc. of Fort Collins Colorado digitized this map under contract for N.Shock. G.Green edited and prepared the digital version for publication as a geographic information system database. The digital geologic map database can be queried in many ways to produce a variety of geologic maps.

Idaho↗
USGS1995

Stratigraphic setting of sediment-hosted mineral deposits in the eastern part of the Hailey 1° x 2° quadrangle and part of the southern part of the Challis 1° x 2° quadrangle, south-central Idaho

The paper version of the Geologic map of outcrop areas of sedimentary units in the eastern part of the Hailey 1x2 Quadrangle and part of the southern part of the Challis 1x2 Quadrangle, south-central Idaho was compiled by Paul Link and others in 1995. The plate was compiled on a 1:100,000 scale topographic base map. TechniGraphic System, Inc. of Fort Collins Colorado digitized this map under contract for N.Shock. G.Green edited and prepared the digital version for publication as a GIS database. The digital geologic map database can be queried in many ways to produce a variety of geologic maps.

Idaho↗
USGS1995

Hydrographs of water levels in observation wells in Idaho, 1944-93

This report presents hydrographs of water levels in 578 observation wells in the statewide monitoring network during 1944-93. The monitoring network is operated by the U.S. Geological Survey in cooperation with the Idaho Department of Water Resources, Bureau of Reclamation, and other Federal and State agencies.

Idaho↗
USGS1995

Water resources data, Idaho, water year 1994: Volume 1. Great Basin and Snake River Basin above King Hill

Water resources data for the 1994 water year for Idaho consists of records of stage, discharge, and water quality of streams; stage, contents, and water quality of lakes and reservoirs; discharge of irrigation diversions; and water levels and water quality of groundwater. The two volumes of this report contain discharge records for 191 stream-gaging stations and 36 irrigation diversions; stage only records for 4 stream-gaging stations; stage only for 9 lakes and reservoirs; contents only for 23 lakes and reservoirs; water-quality for 67 stream-gaging stations, 444 wells, and 6 lake sites; daily totals for 1 precipitation gage; and water levels for 553 observation wells. Additional water data were collected at various sites not involved in the systematic data collection program and are published as miscellaneous measurements. These data represent that part of the National Water Data System operated by the U.S. Geological Survey and cooperating State and Federal agencies in Idaho, adjacent States, and Canada.

Idaho↗
USGS1995

Water resources data, Idaho, water year 1994: Volume 2. Upper Columbia River Basin and Snake River Basin below King Hill

Water resources data for the 1994 water year for Idaho consists of records of stage, discharge, and water quality of streams; stage, contents, and water quality of lakes and reservoirs; discharge of irrigation diversions; and water levels and water quality of groundwater. The two volumes of this report contain discharge records for 191 stream-gaging stations and 36 irrigation diversions; stage only records for 4 stream-gaging stations; stage only for 9 lakes and reservoirs; contents only for 23 lakes and reservoirs; water-quality for 67 stream-gaging stations, 444 wells, and 6 lake sites; daily totals for 1 precipitation gage; and water levels for 553 observation wells. Additional water data were collected at various sites not involved in the systematic data collection program and are published as miscellaneous measurements. These data represent that part of the National Water Data System operated by the U.S. Geological Survey and cooperating State and Federal agencies in Idaho, adjacent States, and Canada.

Idaho↗