File Geodatabase Feature Class
Tags
Brandy Creek, Willow Creek, Pacific treefrog, zinc, mercury, Grizzly Gulch, California, copper, riffle sculpin, beryllium, Whiskey Creek, sulfur, lead, sulphur, iron, bullfrog, ecotoxicology, Clear Creek, selenium, environment, dragonflies, California roach, potassium, New York Gulch, nickel, stoneflies, biota, calcium, French Gulch, chromium, fish, rainbow trout, Cline Gulch, phosphorus, macroinvertebrates, arsenic, vanadium, manganese, barium, amphibians, sodium, dobsonflies, Foothill yellow-legged frog, cobalt, Orofino Creek, boron, cadmium, titanium, banana slug, magnesium, water striders, inlandWaters, molybdenum, beetles, aluminum, silicon, metals, strontium
The overall objective of this study is to provide scientific information to the National Park Service so that potential risks from metals in Whiskeytown's major watersheds can be identified and managed appropriately. This will be accomplished by assessing the extent to which metals from mine sites have contaminated the NRAs ecosystem. Specific objectives are: 1. Identify and characterize contaminant "hot spots" within Whiskeytown National Recreation Area based on concentrations of mercury and other metals in water, sediments, and biota and water quality, benthic macroinvertebrate community structure, and stream habitat quality at sites identified as potentially contaminated. 2. Evaluate major bioaccumulation pathways for mercury and other metals of concern in the affected ecosystems. 3. Based on the scientific literature and any observed abnormalities in the biota, evaluate potential adverse effects mercury or other metals may have on biota present in the watershed.
This dataset represents part of an integrated study to determine the degree and extent to which mercury and other metals from active and abandoned mines within and upstream of Whiskeytown National Recreation Area (NRA) are present in the upper Clear Creek watershed and the magnitude to which they may have bioaccumulated in fish, amphibians, and invertebrates. Elevated metal concentrations in a water body or its sediments do not necessarily result in excessive accumulations in the biota inhabiting these environments. However, when conditions favor the conversion of such metals to organometallic forms, high concentrations may bioaccumulate in biota causing adverse effects or hazardous conditions for predators. In 2000, the U.S. Geological Survey (USGS), at the request of the U.S. Forest Service and the Bureau of Land Management, began a multi-year study of mercury contamination in the Trinity River watershed, Trinity County, California. The Central Valley Project Improvement Act, along with a recent (June 2000) large-scale tadpole die-off, brought water quality and contamination issues to the forefront of the NRA's concern. Therefore, the National Park Service requested the USGS to expand their on-going research in the Trinity River watershed to include the adjacent Whiskeytown NRA, focusing on contaminant levels in fish, frogs, and invertebrates. A plan to meet this need was completed by Hothem, May, and Gibson (2001). For further explanation of this dataset can be accessed at: http://nrm.dfg.ca.gov/FileHandler.aspx?=DocumentID=17043 . WHAT EACH RECORD REPRESENTS: Each record represents a tissue sample which has been analyzed for the presence and concentration of various metals and trace elements. Tissue samples may be individual or aggregrate; please read all the metadata for additional information.
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Disclaimer : The State makes no claims, promises, or guarantees about the accuracy, completeness, reliability, or adequacy of these data and expressly disclaims liability for errors and omissions in these data. No warranty of any kind, implied, expressed, or statutory, including but not limited to the warranties of non-infringement of third party rights, title, merchantability, fitness for a particular purpose, and freedom from computer virus, is given with respect to these data.
Given the sensitive nature of these data, the locational information may be restricted. Contact the data distributor for proper use.
Extent
| West | -122.673284 | East | -122.526789 |
| North | 40.723562 | South | 40.574948 |
| Maximum (zoomed in) | 1:5,000 |
| Minimum (zoomed out) | 1:150,000,000 |
Disclaimer : The State makes no claims, promises, or guarantees about the accuracy, completeness, reliability, or adequacy of these data and expressly disclaims liability for errors and omissions in these data. No warranty of any kind, implied, expressed, or statutory, including but not limited to the warranties of non-infringement of third party rights, title, merchantability, fitness for a particular purpose, and freedom from computer virus, is given with respect to these data.
Given the sensitive nature of these data, the locational information may be restricted. Contact the data distributor for proper use.