Jonathan R. Childs, Noah P. Snyder, and Margaret A. Hampton 2003 text report containing graphical map images (no spatial referencing) <http://geopubs.wr.usgs.gov/open-file/of03-383> A new bathymetric map of Englebright Lake, Yuba-Nevada Counties, California is compared to 1939 elevations captured from a pre-dam topographic survey to determine how much sediment has accumulated in the reservoir in the past 60 years. A longitudinal profile along the entire length (thalweg) of the reservoir and cross-sections across the reservoir at seven points illustrate the pre-dam and present bottom profiles. Calculations of the total volume of sediment impounded by the dam for eight regions of the reservoir are presented. These data are intended for science researchers, policy makers, and the general public. Information for USGS Coastal and Marine Geology related activities are online at: http://walrus.wr.usgs.gov/ 20010501 20010530 ground condition Complete none planned -121.28333 -121.19167 +39.33333 +39.23333 None marine geology lake depth bathymetry reservoir sediment thickness isopach None Englebright Lake Englebright Reservoir Harry L. Englebright Lake Yuba River Yuba County Nevada County California USA None These data are not intended for navigational purposes. Please recognize the U.S. Geological Survey (USGS) as the source of this information. Jonathan R. Childs United States Geological Survey (USGS) Coastal and Marine Geology (CMG) Geophysicist mailing and physical address

USGS, MailStop 999, 345 Middlefield Road

Menlo Park CA 94025-3561 USA (650) 329-5195 jchilds@usgs.gov Data have not been independently verified. Undetermined Reference the report for a description of the bathymetric survey and pre-dam topography model. 1.0 meters One percent (1%) of the water depth for bathymetry; 10 feet for pre-dam topography and sediment thickness. The bathymetry data were collected along continuous boat tracks at a 2 second sample interval. Pre-dam topography was digitized from archival survey records. Bathymetric and elevation models were created at 5-meter grid cell, and the models differenced to calculate sediment thickness and volume. 20030810 Jonathan R. Childs United States Geological Survey (USGS) Coastal and Marine Geology (CMG) Geophysicist mailing and physical address

USGS, MailStop 999, 345 Middlefield Road

Menlo Park CA 94025-3561 USA (650) 329-5195 jchilds@usgs.gov Geographic features (lake bathymetry, pre-dam topography, sediment thickness) are shown as color-contour map images at an unspecified projection and scale. These map images are rendered in Graphic Interchange Format (GIF). none United States Geological Survey (USGS) Information Services mailing and physical address

Box 25286

Denver CO 80225 USA (888)ASK-USGS Please recognize the U.S. Geological Survey (USGS) as the source of this information. USGS-authored or produced data and information are in the public domain. Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, these data and information are provided with the understanding that they are not guaranteed to be usable, timely, accurate, or complete. Users are cautioned to consider carefully the provisional nature of these data and information before using them for decisions that concern personal or public safety or the conduct of business that involves substantial monetary or operational consequences. Conclusions drawn from, or actions undertaken on the basis of, such data and information are the sole responsibility of the user. Neither the U.S. Government nor any agency thereof, nor any of their employees, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any data, software, information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. Trade, firm, or product names and other references to commercial products and services are provided for information only and do not constitute endorsement or warranty, express or implied, by the USGS, USDOI, or U.S. Government, as to their suitability, content, usefulness, functioning, completeness, or accuracy. Graphic Interchange Format (GIF) <http://geopubs.wr.usgs.gov/open-file/of03-383> None 20030810 Jonathan R. Childs United States Geological Survey (USGS) Coastal and Marine Geology (CMG) Geophysicist mailing and physical address

USGS, MailStop 999, 345 Middlefield Road

Menlo Park CA 94025-3561 USA (650) 329-5195 jchilds@usgs.gov Content Standard for Digital Geospatial Metadata ("CSDGM version 2") FGDC-STD-001-1998