Lake Mauvaise Terre Watershed Implementation Plan

Project Description

Lake Mauvaise Terre is located in Morgan County, Illinois and is a water supply for the City of Jacksonville.  It is impaired for numerous constituents, including phosphorus and sediment.  The project was unique and challenging due to its location, its lake pollution issues, and private land ownership.  The AFT received a grant to conduct activities in the watershed aimed at reducing pollution loading to the lake.  Northwater worked with AFT, the city and watershed stakeholders to model pollution loading, identify treatment practices and develop a Watershed Implementation Plan.

Roles included advanced GIS analysis and mapping, a custom map-based pollution load model, and the identified over 280 site-specific implementation projects.  Expected pollution load reductions associated with recommended actions were calculated and practices were negotiated one-on-one with landowners. Northwater also performed a field assessment of watershed conditions, developed a monitoring plan and wrote a $700,000 Illinois EPA Section 319 grant application.  To support the grant application, Northwater was able to secure a financial commitment from the city as well as each landowner; it encompassed over 200 projects with 12 landowners resulting in annual pollutant reductions to the lake totaling 1,773 tons of sediment, 4,131 lbs. of phosphorus, and 15,650 lbs. nitrogen.

Northwater managed the successful plan implementation and completed a complimentary assessment, read more…

Lake Mauvaise Terre Nutrient Reduction Initiative – Plan Implementation & Construction

Lake Mauvaise Terre Streambank Erosion & In-lake Dam Assessment

The AFT has been working with Northwater since 2014 and have been impressed with their work ethic and technical watershed management expertise. This prompted us to engage Northwater to build a water quality model to support our initiates in the Upper Macoupin Creek watershed. After researching other water quality models, we determined that their SWAMM system was the most applicable to our project needs. We are utilizing it to determine cropland areas where in-field management measures, precision outreach, and conservation practices will have the greatest impact on improving water quality. The model has quickly become a reliable tool to support our ongoing efforts. The staff at Northwater are a pleasure to work with and we will continue to engage them to support other AFT initiatives in the Midwest.

- Kris Reynolds, Midwest Deputy Director, American Farmland Trust

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