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During the Pliocene to middle Pleistocene, pluvial lakes in the western Great Basin repeatedly rose to levels much higher than those of the well-documented late Pleistocene pluvial lakes, and some presently isolated basins were connected. Sedimentologic, geomorphic, and chronologic evidence at sites shown on the map indicates that Lakes Lahontan and Columbus-Rennie were as much as 70 m higher in the early-middle Pleistocene than during their late Pleistocene high stands. Lake Lahontan at its 1400-m shoreline level would submerge present-day Reno, Carson City, and Battle Mountain, and would flood other now-dry basins. To the east, Lakes Jonathan (new name), Diamond, Newark, and Hubbs also reached high stands during...
A new bathymetric map of Englebright Lake, Yuba-Nevada Counties,California is compared to 1939 elevations captured from a pre-damtopographic survey to determine how much sediment has accumulatedin the reservoir in the past 60 years. A longitudinal profilealong the entire length (thalweg) of the reservoir and cross-sectionsacross the reservoir at seven points illustrate the pre-dam andpresent bottom profiles. Calculations of the total volume ofsediment impounded by the dam for eight regions of the reservoirare presented.
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