Lake Studies

Lake Study

The Kieser & Associates report can be downloaded by clicking on the link to open the file. You’ll need to enter the password listed on our neighborhood directory.

Summer, 2017 Phase One Report from Keiser & Associates

Mechanical Harvesting

The Lake Manitou Association contracted with Dr. Wallace E. Fusilier, Limnologist, from Water Quality Investigators from 1993 to 2002 to conduct a detailed assessment of our lake. In 2000 the report includes an algal study of the lake.   Lake Study 2000


The following report explains the science of lakes and the terms used in the Lake Study.  It is written by Byron Shaw, Christine Mechenich and Lowell Klessig. Form RP-03/2004.   Understanding Lake Data


2011 Fish Survey: Fish Survey 2011

Cooperative Lakes Monitoring Program

2016 Data Report for Lake Manitou, Shiawassee County

2015 Data Report for Lake Manitou, Shiawassee County

2014 Data Report for Lake Manitou, Shiawassee County

In summary, these reports inform us that between 1995 to 2014 Lake Manitou has 4 feet less water clarity when looking into the water.  

The earlier lake studies and current lake water monitoring data confirm that Lake Manitou has elevated phosphorus levels, much higher than many other Michigan lakes that test for phosphorus. Phosphorus is the fuel for algae blooms and aquatic plant growth.

Algal blooms were noted by Dr. Fusilier and many long time lake residents mention that algae blooms are fairly common, especially in the Spring and Fall. Blue Green algae, common in Lake Manitou, have the potential to produce microcystin, which, in high enough concentrations is harmful to the health of humans and pets. Microcystin was identified in the lake in 2015 and 2016 but fortunately in low concentrations.

E. Coli water testing began in 2016 at In-lake shorelines and at water inlets to Lake Manitou. The Hardy Jennings drain water inlet at Waugh road is identified as carrying concentrations of animal and human E. Coli which are elevated in concentrations during times of high volume water flow. The drain is also a source of high concentrations of phosphorus and soil sediment that enters the lake. Efforts are being undertaken to identify the sources and to mitigate these pollutants.

Goals for Lake Manitou residents: Discourage fertilizing of lakeside lawns. Consider buffer zones at the lake shore where there is no cutting of grass and native plants/flowers are added which have deep root systems. Regular pumping and maintenance of lakeside home septic tanks. Lake and stream water quality monitoring to identify trends, contaminants. Lake water quality improvement. Continued effort to obtain remediation of HardyJennings Drain to eliminate or substantially reduce non point source pollutants of soil sediment, phosphorus and E. Coli.