Lake Sherburne 2002 Report

Ferrari, Ronald

The Bureau of Reclamation (Reclamation) surveyed Lake Sherburne in July of 2002 to develop a topographic map and compute a present storage-elevation relationship (area-capacity tables). The underwater survey was conducted near lake elevation 4,786 feet (project datum). The underwater survey used sonic depth recording equipment interfaced with a global positioning system (GPS) that gave continuous sounding positions throughout the underwater portions of the reservoir covered by the survey vessel. The above-water topography was determined by digitizing a developed reservoir contour line from the U.S. Geological Survey quadrangle (USGS quad) map of the reservoir area. The new topographic map of Lake Sherburne was developed from the combined digitized contours and July 2002 underwater measured topography. This study assumed no change since the 1983 survey from elevation 4,790 (feet) and above. As of July 2002, at maximum water surface elevation 4,810.0, the surface area was 2,163 acres with a total capacity of 108,980 acre-feet. Since initial survey results in 1948, about 343 acre-feet of change have been measured below conservation elevation 4,788.0. Since the 1983 survey, about 1,707 acre-feet of change was measured at elevation 4,788.0. It is assumed the majority of the calculated differences are due to the methods of the surveys and vertical datum differences. It must be noted that the 2002 survey was conducted with a fairly stable survey vessel, but at times in rough water conditions.

Lake Sherburne 2002 Report

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