Historic Water Sampling Reports
Over the past 20 years many dedicated volunteers have helped to write reports on the water quality data from the sampling program. Below is summary data as well as links to pdf reports.
Stream Flow 2000
This bar graph shows the average flow of County streams and lake outfalls measured in 2000. The plot provides a general indication of the ranking of stream and lake outfall flows in 2000. Observe that highest stream flow was measured in Solon Creek, the lowest in Ennis Creek. The impact of a stream on the water quality of the receiving lake is dependent on the nutrient loading to the lake. The loading is the product of the stream flow and the nutrient concentration. Note that the lake outlet flows are higher than the tributary flows.
Stream Nitrate 2000
This bar graph shows the average nitrate plus nitrite concentration of County streams and lake outfalls measured in 2000. The plot provides a general indication of the ranking of stream and lake outfall nitrate plus nitrite concentrations in 2000. Observe that highest stream nitrate plus nitrite concentrations were measured in Houdek Creek, the lowest in Rice Creek. Nitrate plus nitrite concentrations above about 500 mg/m3 are often the result of the application of ammonia fertilizer to support agricultural operations. Low nitrate plus nitrite concentrations in theCrystalRiverare possible indication of nitrogen limited growth conditions for algae inGlenLake.
Stream Phosphorus 2000
This bar graph shows the average total phosphorus concentration of County streams and lake outfalls measured in 2000. The plot provides a general indication of the ranking of stream and lake outfall total phosphorus in 2000. Observe that highest stream total phosphorus was measured in Northport Creek, the lowest in Hatlem Creek. It is important to note that the concentration of total phosphorus in area streams is strongly affected by watershed runoff events that occur during summer storms and spring snow melt. Thus, stream nutrient concentrations are generally highly variable compared to lake concentrations.
Watershed Council/Leelanau Conservancy Reports
The Glen Lake Association through the MDNR and EPA funded a one-year water quality study of Glen Lake completed by Dr. Keilty in 1992. The Leelanau Conservancy also conducted a quantitative assessment of phytoplankton of area lakes in 1993. Finally, a comprehensive study to determine the density of zebra mussels in Lake Leelanau and Little Traverse Lake was conducted in 2002.
The Leelanau Conservancy can provide some of these documents and data upon request or you can download a scanned version below:
State Water Quality Data
Limited lake water quality data has been collected by the Michigan Department of Natural Resources (MDNR, now MDEQ) and the MDNR Self-Help program between 1973 and 1990.
For the STORET database of all water quality data gathered by state or federal agencies click here.