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DNR historical lake survey","url":"https://apps.dnr.wi.gov/doclink/lakes_maps/2649800a.pdf","surveyDate":"1967-08","notice":"Seven digitized historical contour fragments at 10/15/20/25/30 ft, August 1967. Partial contour sections only; other contours remain undigitized. Original label and ink gaps preserved; sections stop before chart artwork intersections. Maximum independent historical placement mismatch about 30 m, excluding manual pixel-picking uncertainty. Source depths are not extended into the modern southeastern spur. Not individual soundings or current measured depths. 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