It has been said that, “if you want to go quickly, go alone – but if you want to go far, go together.” It is widely believed that the Leelanau Conservancy has been and continues to be a wonderful and vital partner in our mission to preserve and protect our watershed. They use tools like “conservation easements” and “donated land” that turn into preserves to help us protect our surface and groundwater resources.
For example, the Leelanau Conservancy has helped us preserve a large part of the wetlands that make up our Hatlem Creek Preserve sub-watershed which affords clear, clean water flowing into Big Glen. Further, the Palmer Woods Preserve in the uplands of our watershed has been managed in such a way that it will be protected from development thereby protecting valuable groundwater that ends up in our lakes. In addition, some of the Crystal River Wetlands are now protected from development and combine with the boundaries of the national park giving our delicate Crystal River the protection that it deserves as evidence by the clear water that some of us take for granted.
The conservancy also can work with individual landowners in our watershed in an effort to preserve the natural shorelines that filter out excess nutrients that can cause our lake to deteriorate. If you would like to consider a “conservation easement” (a legal agreement between a landowner and the conservancy that permanently limits a propter’s use in order to protect its conservation values) for your property, why not consider setting up a meeting with their staff and consider how you, too, might contribute to the mission of preserving and protecting our watershed.
Bring a neighbor or friend to our annual meeting Saturday, August 10. The program will include the state of the lake report, a brief business meeting, strategic plan update and recognition awards. Lunch will follow and there will be free wildflower seed bombs for all!
Held at the Glen Lake Community Church, 4902 W. MacFarland Rd. in Glen Arbor, the meeting begins at 10 am.
The Glen Lake Association is a member of the Cooperative Lakes Monitoring Program (CLMP) which is a volunteer inland lakes water quality monitoring program. Every week during the summer volunteers measure water clarity (secchi disk visibility depth) and at various specified dates sample for phosphorus and Chlorophyll. We measure and sample on Big and Little Glen, Brooks, and Big Fisher lakes.
The CLMP website has data on Big Glen data going back to 1979 for secchi depths and to 2001 for chlorophyll and phosphorus. Water clarity has been improving on Big and Little Glen giving it that look of the blue Mediterranean. You might think this is a good thing, but maybe not Clarity is affected by suspended solids and algae. We believe clarity is increasing due to the removal of zooplankton and algae by zebra or quagga mussels. This means less food for small fish and greater depth where aquatic plants can grow. Our lakes have a lot of mussels. When we do our yearly invasive aquatic plant survey, we often bring up small mussels attached to the plants.
The following chart shows the numbers.
Phosphorus levels for Big Glen are averaging about 4 parts per billion over the last 18 years, dropping slightly. This is very good, indicating that we don’t have a lot of fertilizer or septic runoff into the lake. Some phosphorus is essential for plant and algae growth which is food for fish. Our level is very low.
Chlorophyll is the pigment that allows plants (including algae) to use sunlight to convert simple molecules into organic compounds via the process of photosynthesis. Measuring chlorophyll concentrations in water is a surrogate for actually measuring algae biomass.
The chlorophyll has been steady at less than 1 part per billion for 18 years. These are very low levels which indicates little fertilizer and septic runoff.
In some lakes, as septic systems get older and homes are upsized and lived in for more of the year, phosphorus and chlorophyll levels ramp up. This has not happened to Big Glen. The same is true for Little Glen, Brooks and Big Fisher lakes.