Over the years, the landscape of the Yellow Medicine Watershed has changed through drainage and loss of wetland areas. The Soil and Water Conservation Districts of Lincoln, Lyon and Yellow Medicine counties work cooperatively with the Yellow Medicine River Watershed District to oversee implementation of conservation practices in this watershed. Based on previous Clean Water Partnership diagnostic studies, it is known the river is receiving an excessive loading of nutrients, phosphorus and suspended solids. These conditions have led to declining dissolved oxygen levels as a result.
In previous phases of work, a Hydrologic Simulation Program FORTRAN (HSPF) model of the Zumbro River Watershed was developed to simulate hydrology and water quality for the 1995-2009 simulation period (Phase I), applied to evaluate various management scenarios for reducing sediment and nutrient loading (Phase II), and used to develop Total Maximum Daily Loads (TMDLs) for impaired stream segments and inform development of a nutrient TMDL for Rice Lake (Phase III).
Olmsted Soil and Water Conservation District (SWCD) will work in coordination with Goodhue SWCD, Wabasha SWCD, and Dodge County Environmental Services to collect water quality and chemistry parameters on 23 MPCA approved sites within the Zumbro River watershed during the 2023-24 sampling season.
The Zumbro River watershed HSPF model will be refined to include recent data and information as well as evaluate various management scenarios to inform the most effective actions for reducing sediment and nutrient loading and improving water quality. Specifically, to provide the foundation for the Lake Zumbro Phosphorus Total Maximum Daily Load (TMDL).
The goal of this project is to test the sensitivity of the Zumbro River Watershed Hydrological Simulation Program FORTRAN (HSPF) model management scenario results. Additional goals are to develop Total Maximum Daily Loads (TMDLs) for impaired stream reaches and Rice Lake, which will be documented in a TMDL Report. The consultant will apply the existing calibrated and validated Zumbro River Watershed HSPF model to construct load duration curves to develop TMDLs.
This project will build upon the outreach and education efforts of the Zumbro Watershed Restoration and Protection Strategy (WRAPS). The targeted area will be residents of the Zumbro River Watershed, specifically individuals and organizations that are not professionally involved in managing natural resources. This project will provide necessary outreach and education during the interim between the Zumbro WRAPS and beginning the One Watershed, One Plan process.
