Outdoors: New contour maps reveal lakes’ secrets

New high-tech contour maps are providing more accurate information in attempts to catch fish and restore lakes.

Data have been collected through the use of special sonar equipment on 44 publicly owned lakes in the state, said fisheries biologist Mike Hawkins of Spirit Lake.

Hawkins said contour maps of Iowa lakes have not been made since the 1970s, when they were hand-drawn. Many lake beds have changed, and in some lakes new structure has been added.

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