2000-06-08_AgendaPacket - Laserfiche WebLink

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Year Phosphorus Measured CLA Predicted8 CLA 1999 32 5 18 1998 22 5 12 1997 40 13 22 1996 33 10 18 1995 35 11 19 1994 48 11 27 1993 44 13 24 1992 47 13 26 1991 53 16 30 1990 56 13 31 1989 48 10 27 1988 62 15 35 A similar model has been developed for lakes in the Grass Lake Watershed. Because the three lakes (Owasso, Snail and Wabasso) all have less algae compared to regional norms, dais model can be used to predict algae levels based on the phosphorus content of these lakes. There was some concern expressed by the Lake Owasso Association Executive Committee about the promotion of the shallow lake theory and the conclusion that the Snail Lake experience shows this to be a workable solution. To clarify, the Snail Lake experience is presented to show that there are other shallow lakes where algae is reduced and there is clear water in association with abundant native plants. The conclusion that the plant protection approach is `workable' for Snail Lake is in reference to the fact that the Snail Lake Association, when given this option, agreed it was the best option for their lake. While this is also an option for Lake Owasso, dus is not meant to imply drat it is the best or most workable option for Lake Owasso. Aquatic Plants Aquatic plants have been evaluated periodically by DNR field crews or by Ramsey County Public Works. The plant surveys were conducted using different field methods and at different times during the summer. This summary lists which species were present, and omits details regarding the distribution of plants around the lake. Aquatic Plant Survey Summaries -Lake Owasso 9/48 8/55 6/81 6/84 5/90 6/90 6/91 Submerged plants species Largeleaf pondweed P P P P P Potamogeton amplifolius Curlyleaf pondweed * * P P P P P Potamogeton crispus Variable-leaf pondweed P Potamogeton gramineus Floatingleaf pondweed P P Potamogeton natans Sago pondweed P P P P Potamogeton pectinatus Claspingleaf pondweed P P Potamogeton richardsonii Bobbin's pondweed P Potamogeton robbinsii Flatstem pondweed P P Potamogeton zosteriformis Pondweed P