Long Prairie River Watershed - Low Dissolved Oxygen: TMDL Project

Minnesota's Impaired Waters and TMDLs


Low dissolved oxygen (DO) due to high levels of ammonia impair water quality in the Long Prairie River. Low dissolved oxygen occurs primarily during low-flow conditions, when the volume and current of the water in the river are less than average. The MPCA hired a consultant to complete a modeling study of the Long Prairie River. Results from the TMDL study indicate that, with ammonia reductions, it is possible to meet the dissolved oxygen standard in the Long Prairie River during low flow conditions. The TMDL report was approved by the EPA on August 5, 2005.  The Todd County Soil and Water Conservation District (SWCD) is now developing the implementation plan.

Map and location

The Long Prairie River flows approximately 100 miles from its headwaters at Lake Carlos to its outfall near Motley into the Crow Wing River, and eventually, to the Upper Mississippi River. 


TMDL report and implementation plan

Other documents



Information contact

Jim Hodgson, Basin Coordinator
7678 College Road Suite 105
Baxter, MN 56425