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Long Prairie River Watershed TMDL Project – Lessons Learned from Phase I
Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.orgCitation: Pp. 141-147 in Total Maximum Daily Load (TMDL) Environmental Regulations: Proceedings of the March 11-13, 2002 Conference, (Fort Worth, Texas, USA) 701P0102.(doi:10.13031/2013.7540)
Authors: Hafiz M. Munir, Bashar Sinokrot, Dennis E. Ford
Keywords: TMDL, Long Prairie, SWAT, model, monitoring, DO, Minnesota
Long Prairie River drains a predominantly agricultural 883-square mile watershed in central Minnesota.
Designated uses of the River are aquatic life, recreation, industrial consumption, agriculture, wildlife,
aesthetic enjoyment, and navigation. Monitoring in recent years has shown dissolved oxygen (DO)
concentrations in portions of the river and at Motley intermittently below the state water quality
standard of 5 mg/L. As a result, Minnesota Pollution Control Agency (MCPA) placed four lower-river
reach segments on the agencys 1998 303(d) list.
The objectives of the study are to define the extent, persistence, and severity of the DO depletion
problem, and develop a TMDL for the watershed. The project has three phases. Phase I is an
analysis of existing data to determine what additional data will be needed to complete the project
objectives and what technical issues will need to be addressed within the scope of the project.
Additional data will be collected, analyzed, and reported in Phase II. Modeling and TMDL
development will be conducted in Phase III. The project is anticipated to complete by December