Extremely ClearSecchi disk reading of at least 15 ft. Extremely clear water indicates a lake is obligotrophic, which means the lake is clear, deep, and largely free of weeds. In many cases there are less fish overall, but more trophy size fish.
ClearSecchi disk reading of 10 to 15 ft. These mesotrophic lakes are very clear lakes with few weeds. They often have more fish than an obligotrophic lake but less than an eutrophic one. There is good balance in mesotrophic lakes.
Moderately ClearSecchi disk reading of 7 to 10 ft. These lakes fall between eutrophic and mesotrophic on the scale. They have more weeds and fish than the mesotrphic lakes and less weeds and fish than the eutrophic lakes.
MurkySecchi disk reading of 4 to 7 ft. Lakes with murky water are considered to be eutrophic. They support a large fish population and have a fair amount of weeds.
Very MurkySecchi disk reading of less than 4 ft. Very murky water means a lake is hypereutrophic. These lakes are very weedy and subject to frequent algae blooms. On the plus side, they support large fish populations.
Important if you are looking for swimming lakes or fishing lakes.