Clean Yahara SCR_06_10

Purpose

Yahara CLEAN is a MOU the Sec. Frank, DATCP’s Sec. Nilsustuen, Dane County Executive Falk, and Madison's Mayor Cieslewizc signed to improve the water quality of the Yahara chain of Lakes which includes: Lakes Mendota, Monona, Waubesa, Kegonsa and Wingra. The MOU calls an assessment of the watershed to determine the sources and amounts of the nutrients and sediment into the lakes, and an implementation plan to improve upland practices to reduce the nutrient/sediment into the lakes. This effort will supplement the Rock River TMDL. The Lakes and most of their tributaries are not on the 303 d list so the TMDL that is underway will not have limits for nutrient or sediment reduction. The MOU partners agreed to an alternative “TMDL” process outside the regulatory framework. To determine activities that are needed to affect water quality and what those activities, Dane County has funded to modeling efforts. The first is a SWAT model ($105,000) that will identify the about 3 sq. mi. “hot spots” within the watershed that most affect lake quality. The resulting model can be used in future nutrient trading within the basin. The second is SNAP Plus field level modeling ($35,000) within the North Pheasant Branch – the subbasin that an earlier study recognized as contributing the most P. To support the modeling calibration and to measure future water quality improvement success, Dane County is funding the gaging equipment to measure flow, P and TSS and is looking for DNR and USGS to partner on the operating costs. This data will supplement a network of existing gages. The flow data will also be used to create, calibrate and as direct input into a lake level/dam operation model (INFOS) funded by the City of Madison (first of three year funding - $19,000).

Objective

To support the modeling calibration and to measure future water quality improvement success, Dane County is funding the gaging equipment to measure flow, P and TSS and is looking for DNR and USGS to partner on the operating costs. This data will supplement a network of existing gages. The flow data will also be used to create, calibrate and as direct input into a lake level/dam operation model (INFOS) funded by the City of Madison (first of three year funding - $19,000).

Outcome

The outcome will be less algal blooms, beach closings and other water quality impediments in the Yahara chain of Lakes. Sample results will be used to calibrate SWAT and SNAP Plus models to assess the nutrient and sediment inputs to Lake Mendota. The calibrated models will be used to prioritize and design land activities to reduce nutrients and sediment in to Lake Mendota which will improve water quality. To collect pre-data on Sixmile Creek and Dorn Creek. This data set will be used to determine the effectiveness of the Regional Digestion Facility that is being proposed. A regional Manure Digestion Plant is being proposed for this area. These two watersheds are major contributors of nutrients to Lake Mendota and the Yahara River (Lake Monona, Lake Waubesa, and Lake Kegonsa). This is a huge step in Manure Management, that has never been done anywhere in Wisconsin.

Related Reports

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Targeted Monitoring
Watershed Project
SCR_06_CMP10
2009
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