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1999-10-07_AgendaPacket
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1999-10-07_AgendaPacket
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4/15/2010 3:31:15 PM
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Commission/Committee
Commission/Authority Name
Grass Lake WMO
Commission/Committee - Document Type
Agenda/Packet
Commission/Committee - Meeting Date
10/7/1999
Commission/Committee - Meeting Type
Regular
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parameters measured fell within the range expected for a category I lake. This classification <br />indicates that Snail Lake supports direct contact recreational activities. Summer average <br />water quality parameters (May-Sept., 1997) were as follows: Secchi disk depth = 3.9 meters; <br />total phosphorus = 23.3 ug/L; chlorophyll = 3.6 ug/L; TSI= 44.3. These values are consistent <br />with a mesotrophic (moderate nutrient level) system during 1997. <br />Sennett Lake <br />Bennett Lake is used for fishing and is associated with a city park. Based on 1997 water <br />quality data, Bennett Lake's existing classification would be Category II. This classification <br />indicates that Bennett Lake supports indirect contact recreational activities such as fishing. <br />Secchi disk depth (1.8 meters) falls within the range of category I water bodies. Total <br />phosphorus (86.4 ug/L) during 1997 is consistent with a category III classification. <br />Chlorophyll a concentrations during 1997 (6.48 ug/L) were within the range of category I <br />water bodies. Mean trophic state index (56) is consistent with a category II water body. <br />Therefore, overall classification is category II. Water quality in Bennett Lake is consistent <br />with a eutrophic (high nutrient) system. <br />Lake Emily <br />Lake Emily has no current water quality data other than Secchi disk depth for 1998. The <br />Secchi disk summer average depth of 1.6 meters indicates a eutrophic system. Previous <br />classification of Lake Emily suggests that its existing classification would be Category II. <br />Secchi depth is consistent with this classification, but more data needs to be collected to <br />ascertain the proper current classification. <br />Lake Judy <br />Lake Judy does not have any current water quality data. Most recent data (1986) suggest a <br />hypereutrophic system (i.e., high nutrient). Previous classification by the Grass Lake WMO <br />was Category II, but most recent data suggest an existing classification of Category III may <br />be more appropriate. More data needs to be collected to determine the proper classification <br />of Lake Judy. <br />Grass_lake_class_system.doc Page 6 09/27/99 <br />
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