Big Eau Pleine TMDL Monitoring


Project Description: This project consists of mulit-phased intensive sampling effort that utilizes an already developed partnership between, WDNR, Wisconsin Valley Improvement Company (WVIC) and a Citizen Based Monitor (CBM). WDNR will be responsible for obtaining roughly 1/3 of the samples while the other partners will obtain the remainder. Sampling started in October 09 with tributary monitoring at four locations (three tribs and one outflow) which will continue through September 2012. Trib monitoring: The Big Eau Pleine River is the major tributary to the flowage and has an established gaguing station funding with assistance with WVIC. Two additional gauges were installed on Fenwood and Freeman Creeks and funding is needed to continue their operation through September 2012. A CBM continues to collect samples the last week of each month from the tributaries while DNR collects samples the second week of each month. Lake Sampling: Bi-weekly lake sampling will commence in April 2010 and will continue through end of the fiscal year. This monitoring is funded from last years special project request. Additional funding is needed to continue lake sampling for the project from July 2011 into 2012. CBM's may be used to gather secchi data over the same period also. DO/Temp/ph/Cond profiles will be conducted at the three sampling points on the lake.


Project Justification: The Big Eau Pleine flowage has a well documented history of eutrophic water quality conditions as a result of phosphorus loading from the watershed. In addition, low dissolved oxygen concentrations are documented during the winter. These problems are a result of agricultural runoff from the watershed. Moreover, the Marathon County Land and Water Conservation Department (LWCD) has been working with local farmers to control runoff but more quanitfication from specific areas is needed. The finished product, a TMDL, will provide all cooperating partners with a valuable tool for land management. The Big Eau Pleine is an immensely popular fishing destination for anglers accross the state. A noted walleye, bass, pike, musky and panfish population draws anglers of all ages and sports clubs to the area. Many other nonangling citizens use the flowage as a destination for vactions. FInally, this flowage suffers from major algal blooms due to vast nutrient loading. Because of the algal blooms there are large diurnal fluctuations of dissolved oxygen and pH. These values often exceed water quality standards and are responisble for the 303D listing.


There are three tributary sites, 1 outlfow site and 4 inlake sites. This project will fund 12 monthly sampling events for three tributary sites and 24 biweekly events for one outflow site. The flowage will be sampled 9 times during the growing season and spring turnover at four locations. Data will be entered into SWIMS automatically after lab analysis is complete. A final TMDL report will be completed after all monitoring is complete. It should be noted that monitoring will continue through September 2012, therefore funds will be requested the second year to the biennium.

Related Reports

Run Project Summary Report
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TMDL/303d Projects
Determine Pollutants or Impairments
Final Report Needed
Activities & Recommendations
TMDL Implementation
The action for this project should be considered TMDL monitoring not TMDL implementation.