This report describes the May-June 2002 Englebright Lake coring project. Englebright Lake is a 14-km-long reservoir on the Yuba River of northern California, impounded by Englebright Dam, which was completed in 1940. The sediments were cored to assess the current conditions in the reservoir as part of the California Bay-Delta Authority's Upper Yuba River Studies Program. Sediment was collected using both hydraulic-piston and rotational coring equipment mounted on a floating drilling platform. Thirty boreholes were attempted at seven sites spaced along the longitudinal axis of the reservoir. Complete sedimentary sections were recovered from 20 boreholes at six sites. In total, 335 m of sediment was cored, with 86 percent average recovery. The core sections (each up to 1.5 m long) were processed using a standard set of laboratory techniques, including geophysical logging of physical properties, splitting, visual descriptions, digital photography, and initial subsampling. This report presents the results of these analyses in a series of stratigraphic columns. Using the observed stratigraphy as a guide, several series of subsamples were collected for various sedimentologic, geochemical, and geochronological analyses.
Download this 32-page report as a PDF document (2.4 MB with a link to a 6.3-MB plate file)
Download the 10-sheet collection of plates as a PDF document (6.3 MB; mostly 36-inches wide and up to 72 inches long)
For questions about the content of this report, contact Dave Rubin
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