Archives at the Institute for Fisheries Research (IFR) hold records of thousands of lake surveys from the University of Michigan and Michigan Department of Natural Resources. The records contained in this dataset are jpeg images of the index card records from the IFR surveys for Water Analysis (WATR). Images include the front of the card and when available, the back of a card. and Water analysis cards include information on water profile data. Profile data are the depth and corresponding temperature, oxygen content, and alkalinity.
