Targeted Watershed Approach
Planning (WQ, Nine Key Element)
The overall goal of this project is to evaluate the success of the Mead Lake TMDL and determine if additional TP load reductions are needed from the watershed. There are multiple objectives of this project. 1) Data collected will be used to determine if the installation of BMPs have reduced TP loading from the watershed and if water quality conditions improved in Mead Lake. The data will help evaluate the accuracy of the TP load reduction goal developed in the 2008 TMDL. The information may help in assessing new TP sources in the watershed. 2) Data collected will provide a baseline to document current water quality conditions and will allow for a comparison following additional BMP installation. This study will allow for an overall watershed and a site specific evaluation.
Mill Creek TWA 2020 Watershed Map (319 project-funded) (2022 WQMPLAN)
Mill Creek is a 47-mile tributary of the Wisconsin River. The stream originates in the City of Marshfield and has minimal stream flow in the upper reaches. The Marshfield WWTP discharges to the headwaters of Mill Creek and contributes more than 90% of the stream flow at the point of discharge. The upper 14 miles of the stream is listed in NR 104 as a Limited Aquatic Life variance stream and the lower 33 miles is classified as Fish and Aquatic life waters. Mill Creek is also listed as an impaired water body on EPA’s 303d list for low dissolved oxygen, which required the Department to develop a TMDL for the stream. The stream is impacted by storm water run-off from Marshfield, sedimentation, barnyard and cropland run-off, flashy stream flow, channel ditching, stream bank erosion, ammonia toxicity and nutrient enrichment. Large volumes of storm water scours streambeds erode streams banks, and carries sediment, nutrients, and other pollutants to surface waters. August 2000 HBI results suggest there is a significant organic loading to the stream. Water samples collected in the winter of 2000 (before the new treatment plant was built) found ammonia concentrations high enough to cause chronic toxicity to aquatic life based on EPA criteria. Since Mill Creek is currently classified as Limited Aquatic Life, the WWTP in Marshfield has no ammonia limit. This plan provides an overview of the physical characteristics of the Mill Creek watershed including land use and land management. The plan will also summarize the several environmental studies and programs that increased the understanding of the causes of water quality degradation, past conservation initiatives and investments aimed at reducing agricultural runoff, and program outcomes. The intent of the background information is to provide a historical perspective of water quality and quantity issues for the watershed which will serve as a basis for developing a long range plan for the river system. Success is achieved when the long term use of soil and water resources are balanced with the safety, health and prosperity of the community. At the time of the Mill Creek watershed plan submission (2019), the Total Maximum Daily Load (TMDL) plan for the Wisconsin River basin has been submitted to EPA for review and approval. Wood County acknowledges that the pollutant reduction goals and allocation limits developed to address the current resource concerns in both streams and flowages in the Mill Creek Watershed are forthcoming. Wood and Portage County also acknowledge that once the Wisconsin River Basin TMDL report is complete, this plan may need to be modified to be consistent with the TMDL report.
Nine Key Element Plan
Support of 9key plan