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Scientific Investigations Map 2949

Prepared in cooperation with the Iowa Department of Natural Resources

Bathymetric Contour Maps of Lakes Surveyed in Iowa in 2004

By S. Mike Linhart and Kris D. Lund

U.S. Geological Survey Scientific Investigations Map 2949

AVAILABLE ONLINE ONLY


Abstract

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] Thumbnail image of Lake Darling plate

Plate B: Bathymetric Contours of Littlefield Lake, Audubon County, Iowa [1-MB PDF] Thumbnail image of Littlefield Lake plate

Plate C: Bathymetric Contours of Lake Minnewashta, Dickinson County, Iowa [1.8-MB PDF] Thumbnail image of Lake Minnewashta plate

Plate D: Bathymetric Contours of Nine Eagles Lake, Decatur County, Iowa [1.3-MB PDF] Thumbnail image of Lake Nine Eagles plate

Plate E: Bathymetric Contours of Prairie Rose Lake, Shelby County, Iowa [1.35-MB PDF] Thumbnail image of Prairie Rose Lake plate

Plate F: Bathymetric Contours of Upper Gar Lake, Dickinson County, Iowa [0.9-MB PDF] Thumbnail image of Upper Gar Lake plate

 

SIM 2949 Metadata

 

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