Big Eau Pleine TMDL Monitoring 2012-2013


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 2013. Trib monitoring: The Big Eau Pleine River is the major tributary to the flowage and has an established gauging 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 2013 A CBM volunteer 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: Additional funding is needed to continue lake sampling for the project from July 2012 into 2013. 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.


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 outflow site and 4 inlake sites.This project will fund 6 monthly sampling events for three tributary sites and 12 biweekly events for one outflow site. The flowage will be sampled 9 times during the growing season. 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 2013.

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