Lake Mauvaise Terre Nutrient Reduction Initiative – Plan Implementation & Construction

Project Description


Lake Mauvaise Terre is the back-up water supply for the City of Jacksonville, Illinois.  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 in executing an Illinois EPA funded Section 319 grant for planning and project implementation. Immediately following completion of a watershed plan and supplementary streambank erosion and in-lake dam feasibility study, Northwater helped to secure almost $700,000 in funding to install more than 200 individual treatment practices.

Northwater oversaw all implementation activities including engineering and design, administration, construction oversight and inspection, and project management.  Over a 2-year period, more than 200 individual practices spanning 66 project sites were surveyed, designed, and constructed, more than originally proposed and under budget. Practices installed included:

  • Over 24,000 feet of water and sediment control basins
  • Over 19 acres of grassed waterways
  • 420 acres of cover crops
  • 17 grade control structures
  • Over 2,000 feet of low gradient surface drains
  • 2 sediment basins and 1 pond
  • 1 Livestock waste treatment system

It is estimated that this project achieved annual load reductions to the lake of 4,534 lbs for phosphorus, 16,674 for nitrogen, and 2,274 for sediment, substantially higher than originally projected.

Read more about the watershed plan and other complimentary assessments…

Lake Mauvaise Terre Watershed Implementation Plan

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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