Lake Mauvaise Terre Watershed Implementation Plan

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.  Northwater was retained as the lead consultant to assist the American Farmland Trust (AFT) and City of Jacksonville in executing an Illinois Environmental Protection Agency (IEPA) funded Section 319 grant.  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 developing an implementation plan in addition to performing advanced GIS analysis and mapping. Northwater built a custom GIS-based pollution load model, identified over 280 site-specific implementation projects as well as numerous basin-wide practices.  Expected pollution load reductions associated with recommended actions were calculated and practices were negotiated one-on-one with landowners. Northwater also attended City Council meetings, performed a field assessment of watershed conditions, developed a monitoring plan and wrote a $700,000 IEPA 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; the grant application encompasses over 200 projects with 12 landowners and will result in annual pollutant reductions to the lake totaling 1,773 tons of sediment, 4,131 lbs. of phosphorus, and 15,650 lbs. nitrogen.

Project Details
  • Location: Jacksonville, Illinois
  • Client: American Farmland Trust
  • Sector: Local Government