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Category 11 <br />Water bodies in this category generally meet the following water quality criteria: a mean <br />summer Secchi disk depth of 0.9 meters, which corresponds to a total phosphorus <br />concentration of about 75 ug/L, and a chlorophyll a concentration of about 40 ug/L. The <br />Carlson's TSI index should be no greater than 60 (moderately eutrophic) to meet this <br />management category. <br />Water bodies that meet these water quality limits are also popular with the public. They are <br />typically used the most for indirect contact recreational activities, including sail boating, <br />motor boating, canoeing, and fishing. These activities involve incidental contact with lake <br />water, but do not generally require the water clarity found in direct contact recreational <br />waters. Algal blooms in mid to late summer may limit direct contact recreational activities <br />such as swimming and water skiing. This classification could also include ecologically or <br />biologically unique resources, or water bodies that directly or indirectly affect such a <br />resource. <br />Category III <br />These water bodies have poorer water quality than Category I and II water bodies and <br />generally meet the following water quality criteria: a mean summer Secchi disk depth of 0.7 <br />meters or more, which corresponds to a total phosphorus concentration less than 105 ug/L, <br />and a chlorophyll a concentration less than 60 ug/L. These Carlson TSI index should be no <br />greater than 65 (highly eutrophic) and management should be aimed at preventing these <br />water bodies from moving to hypereutrophy, which begins at a TSI of about 70. <br />Water bodies that fall into this category typically are not viewed as swimmable but serve <br />important functions as wildlife habitat and for aesthetic enjoyment. These water bodies may <br />also provide opportunities for warm-water fishing, provided winterkill does not occur. <br />Category III water bodies are also generally accessible to the public for educational, <br />interpretation, and nature appreciation. This classification could also include ecologically or <br />biologically unique resources, or water bodies that directly or indirectly affect such a <br />resource. <br />Water levels in these ponds should be maintained (e.g., pond baunce no more than three feet) <br />to minimize effects on wildlife utilizing the near-shore zone (such as bird nesting habitat). <br />Grass_lake_class_system.doc Page 3 09/27/99 <br />