The Paw Paw Lake Foundation is dedicated to the improvement of Paw Paw Lake,
Berrien County Michigan
The Townships of Coloma and Watervliet recently approved the creation of a Special Assessment District (SAD) for Paw Paw Lake that will provide funding for important water quality improvements. SONAR will be applied to rid the lake of Eurasian Milfiol and Aeration technology will be used to reduce the nutrient levels in the lake. The SAD funded projects will be implemented starting in 2012 and contiinue for five years.
The Problem with Nutrients
The problem with Eurasian Milfiol in Paw Lake wasn’t caused by high level of nutrients in the lake, The Milfiol was just well fed by the nutrients. The Eurasian Milfiol, which is not indigenous to inland lakes in Michigan, was transported to Paw Paw Paw Lake from the props and bottoms of boats. Once it entered the lake it continued to thrive and spread because it was so well fed by the abundance of nutrients in the lake.
The nutrients also feed the algae in the lake. Algae is the green mucky slim that appears in the lake periodically over the summer. Algae effects the water clarity and causes skin and eye irritation.
The high level of nutrients in the lake have two basic causes, bottom sediment and high level inputs from the County drains. The County drain known as the Branch & Derby is the largest contributor. If the SAD funded Aeration trial reduces the phosphorus concentrated in the bottom sediments, the next goal is to find a way to reduce the phosphorus and sediment load entering the lake from the Branch & Derby Drain. The Foundation is actively working on that project. (See details on the "breaking news" tab.)
Everyone wants the water quality of Paw Paw Lake to be crystal clear and healthy. Eliminating the Eurasian Milfiol will be a major improvement. Reducing the nutrient level in the lake would also be a major improvement. The high nutrient level in the lake, however, cannot be reduced easily. Large amounts of nutrients are released from the bottom sediments in the lake. Removing the bottom sediments would help solve the problem, but the cost is prohibitive.
The Aeration trial has the potential to reduce nutrients in the lake, but it would require the trial to be successful, and then the Aeration trial would need to be significantly expanded. The PPLF is optimistic.
Nutrients and sediment also enter the lake throughout the year from the county drains. Finding a way to reduce the nutrients and sediment entering the lake from the largest drain, the Branch & Derby drain, is a project currently under way by the Foundation. The PPLF recently allocated $35K to fund a study that will help determine "how to" fix the problem. (See "breaking news for more.)
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