Scientific Investigations Map 2949
Prepared in cooperation with the Iowa Department of Natural Resources
By S. Mike Linhart and Kris D. Lund
U.S. Geological Survey Scientific Investigations Map 2949
AVAILABLE ONLINE ONLY
The U.S. Geological Survey, in cooperation with the Iowa Department of Natural Resources, conducted bathymetric surveys on six lakes in Iowa during 2004 (Lake Darling, Littlefield Lake, Lake Minnewashta, Nine Eagles Lake, Prairie Rose Lake, and Upper Gar Lake). The surveys were conducted to provide the Iowa Department of Natural Resources with information for the development of total maximum daily load limits, particularly for estimating sediment load and deposition rates. The bathymetric surveys can provide a baseline for future work on sediment loads and deposition rates for these lakes. Two of the lakes surveyed in 2004, Lake Minnewashta and Upper Gar Lake, are natural lakes. The other four lakes are manmade lakes with fixed spillways.
Bathymetric data were collected using a boat-mounted, differential global positioning system, echo depth-sounding equipment, and computer software. Data were processed with commercial hydrographic software and exported into a geographic information system for mapping and calculating area and volume. Lake volume estimates ranged from 83,924,000 cubic feet (1,930 acre-feet) at Lake Darling to 5,967,000 cubic feet (140 acre-feet) at Upper Gar Lake. Surface area estimates ranged from 10,660,000 square feet (240 acres) at Lake Darling to 1,557,000 square feet (36 acres) at Upper Gar Lake.
Plate A: Bathymetric Contours of Lake Darling, Washington County, Iowa [1.8-MB PDF] 
Plate B: Bathymetric Contours of Littlefield Lake, Audubon County, Iowa [1-MB PDF] 
Plate C: Bathymetric Contours of Lake Minnewashta, Dickinson County, Iowa [1.8-MB PDF] 
Plate D: Bathymetric Contours of Nine Eagles Lake, Decatur County, Iowa [1.3-MB PDF] 
Plate E: Bathymetric Contours of Prairie Rose Lake, Shelby County, Iowa [1.35-MB PDF] 
Plate F: Bathymetric Contours of Upper Gar Lake, Dickinson County, Iowa [0.9-MB PDF] 
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