This project addresses one impairment in the lower portion of the Minnesota River during low flow conditions. The main sources of excess phosphorus during low flow conditions include wastewater treatment facilities, direct discharges of sewage, stormwater, and agriculture. Results from the TMDL study indicate that, with phosphorus reductions, it is possible to meet the dissolved oxygen standard in the Lower Minnesota River during low flow conditions.
The U.S. Environmental Protection Agency (EPA) approved the Total Maximum Daily Load (TMDL) report in September 2004, and an implementation plan has been developed.
Map and location
The Minnesota River has a dissolved oxygen impairment from river mile 22 to the mouth of the Mississippi River. The Minnesota River is located in the Lower Minnesota River watershed.
TMDL report and implementation plan
- Lower Minnesota River TMDL - Low Dissolved Oxygen (EPA approval 8/28/2004)
- Lower Minnesota River TMDL: Low Dissolved Oxygen - Fact Sheet
- Dissolved Oxygen Problem in the Lower Minnesota River - Fact Sheet
- Frequently Asked Questions
- Lower Minnesota River Dissolved Oxygen TMDL Advisory Committee
- Response to Comments
- Lower Minnesota River TMDL: EPA approval letter (Sept. 2004)
- Lower Minnesota River Dissolved Oxygen TMDL Implementation Plan - Final
Minnesota Pollution Control Agency
12 Civic Center Plaza Ste 2165
Mankato, MN 56001