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Area and volume calculations show a maximum area of about 508,000 acres (2,056 square kilometers) and a maximum volume of about 9,257,000 acre-feet (11.42 cubic kilometers) at a water-surface altitude of 4,200 feet (1,280 meters). Minimum water-surface altitude of the south part of Great Salt Lake is just below 4,167 feet (1,279 meters) in the area just south of the Union Pacific railroad causeway halfway between Promontory Point and the western edge of the lake. At this altitude, and continuing up to about 4,176 feet (1,279 meters), the south part of the lake is separated into two areas by a ridge extending from Promontory Point to Hat Island. These data have been published in Baskin, R.L., and Allen, D.V., 2005, Bathymetric map of the south part of Great Salt Lake, Utah: U.S. Geological Survey Scientific Investigations Map 2894, published online at http://pubs.usgs.gov/sims/2005/2894/. Supplemental information can be found in Baskin, R.L., 2005, Calculation of area and volume for the south part of Great Salt Lake, Utah: U.S. Geological Survey Open-File Report 2005\u20131327, available online at http://pubs.usgs.gov/of/2005/1327/.", "geometryType": "esriGeometryPolygon", "sourceSpatialReference": { "wkid": 102100, "latestWkid": 3857, "xyTolerance": 0.001, "zTolerance": 0.001, "mTolerance": 0.001, "falseX": -20037700, "falseY": -30241100, "xyUnits": 10000, "falseZ": -100000, "zUnits": 10000, "falseM": -100000, "mUnits": 10000 }, "copyrightText": "Baskin, R.L., and Allen, D.V., 2007, Digital bathymetric data for the south part of Great Salt Lake, Utah: U.S. Geological Survey Data series Report xxxx, Salt Lake City, UT, August 2007. 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