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Scientific Investigations Map 3051

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### Prepared in cooperation with the Iowa Department of Natural Resources

## Bathymetric Contour Maps for Lakes Surveyed in Iowa in 2006

#### By S.M. Linhart and K.D. Lund

| Abstract
The U.S. Geological Survey, in cooperation with the Iowa Department of Natural Resources, conducted bathymetric surveys on two lakes in Iowa during 2006 (Little Storm Lake and Silver 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. Both of the lakes surveyed in 2006 are natural lakes.

For Silver Lake, bathymetric data were collected using boat-mounted, differentialglobal positioning system, echo depth-sounding equipment, and computersoftware. For Little Storm Lake, because of its shallow nature, bathymetric data were collected using manual depth measurements. Data were processed with commercial hydrographic software and exported into a geographic informationsystem for mapping and calculating area and volume. Lake volumes were estimated to be 7,547,000 cubic feet (173 acre-feet) at Little Storm Lake and 126,724,000 cubic feet (2,910 acre-feet) at Silver Lake. Surface areas were estimated to be 4,110,000 square feet (94 acres) at Little Storm Lake and 27,957,000 square feet (640 acres) at Silver Lake. | Version 1.0

Posted November 2008
-  **Sheet 1-Little Storm Lake** PDF (653 kB) 
-  **Sheet 2-Silver Lake** PDF (678 kB) 
-  **Downloads** Directory  Contains: zipped interchange files of the Arc coverages used in generating the maps for each sheet. Refer to the Readme and Metadata files for more information. 

**For additional information contact:**          Director, USGS Iowa Water Science Center		400 South Clinton Street, Room 269		Iowa City, IA 52240		(319) 337–4191		Or visit the Iowa Water Science Center Web Site at:http://ia.water.usgs.gov

Part or all of this report is presented in Portable Document Format (PDF); the latest version of Adobe Reader or similar software is required to view it. Download the latest version of Adobe Reader, free of charge.   |
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### Suggested citation:

Linhart, S.M., and Lund, K.D., 2008, Bathymetric contour maps for lakes surveyed in Iowa in 2006: U.S. Geological Survey Scientific Investigations Map 3051, 2 sheets.

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U.S. Department of the Interior | U.S. Geological Survey	URL: *http://pubsdata.usgs.gov/pubs/sim/3051/index.html*	Questions or Assistance: Contact USGS	Last modified: Thursday, 01-Dec-2016 17:12:29 EST

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