w:Lake Kampeska water depth map from a w:USGS report published in 2002.
http://pubs.usgs.gov/wri/wri024171/pdf/lakekampeska.pdf
Sediment Accumulation and Distribution in Lake Kampeska, Watertown, South Dakota
Water-Resources Investigations Report 02-4171
Prepared by Bryan D. Schaap and Steven K. Sando. 

Figure 18, Page 37.
Prepared by Bryan D. Schaap and Steven K. Sando.