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and water skiing. This classification could also include ecologically or biologically unique resources, or water bodies that directly or indirectly affect such a resource. Category II Water bodies in this category generally meet the following water quality criteria: a mean summer Secchi disk depth of 0.9 meters, which corresponds to a total phosphorus concentration of about 7~ ug/L, and a chlorophyll a concentration of about 40 ug/L. The Carlson's TSI index should be no greater than 60 (moderately eutrophic) to meet this management category. Water bodies that meet these water quality limits are also popular with the public. They are typically used the most for indirect contact recreational activities, including sail boating, motor boating, canoeing, and fishing. These activities involve incidental contact with lake water, but do not generally require the water clarity found in direct contact recreational waters. Algal blooms in mid to late summer may limit direct contact recreational activities such as swimming and water skiing. This classification could also include ecologically or biologically unique resources, or water bodies that directly or indirectly affect such a resource. Category III These water bodies have poorer water quality than Category I and II water bodies and generally meet the following water quality criteria: a mean summer Secchi disk depth of 0.7 meters or more, which corresponds to a total phosphorus concentration less than 105 ug/L, and a chlorophyll a concentration less than 60 ug/L. These Carlson TSI index should be no greater than 65 (highly eutrophic) and management should be aimed at preventing these water bodies from moving to hypereutrophy, which begins at a TSI of about 70. Water bodies that fall into this category typically are not viewed as swimmable but serve important functions as wildlife habitat and for aesthetic enjoyment. These water bodies may also provide opportunities for warm-water fishing, provided winterkill does not occur. Category III water bodies are also generally accessible to the public for educational, interpretation, and nature appreciation. This classification could also include ecologically or biologically unique resources, or water bodies that directly or indirectly affect such a resource. Water levels in these ponds should be maintained (e.g., pond bounce no more than three feet) to minimize effects on wildlife utilizing the near-shore zone (such as bird nesting habitat). Grass_lake_class_system Page 3 10/22/99