Middle Trempealeau TMDL

Purpose

The Wisconsin Department of Natural Resources (WDNR) developed six sediment TMDLs for six segments in the Middle Trempealeau River watershed. The TMDLs address the sediment impacts and impairments which were identified on the Wisconsin 1998 303(d) list. The segments were ranked as medium or low priority on the Wisconsin 1998 303(d) list. The waterbody segments are located in Trempealeau and Buffalo Counties, Wisconsin.

Objective

Wisconsin Administrative Code (WAC) as the applicable standard. This standard states in part, Substances that will cause objectionable deposits on the shore or in the bed of a body of water, shall not be present in such amounts as to interfere with public rights in waters of the state. The state established a water quality target for the segments as meeting a potential use of Cold Water Class II or Class III community, as described in NR 1.02(7)(b) of the WAC. Although sediment has been determined to be the pollutant of concern, WDNR will be monitoring the fish community to determine the effectiveness of TMDL implementation, as the fish community is the designated use being impaired.

Outcome

These total load capacities represent an approximate 45% reduction of sediment entering the six creeks for existing conditions (based on 1990 information). WDNR has determined that these reductions in sediment will achieve the water quality target of establishing the appropriate cold water community in the segments. Establishment of a cold water community has been determined by WDNR to be an adequate surrogate for the narrative water quality standard. The TMDLs include a monitoring plan which is appropriate for demonstrating whether or not progress has been made towards establishment of the cold water community. Since sediments impact the fish community in several ways (reproduction, food supply, raising water temperature), and sediments are not a toxic, no specific critical condition exists.

QA Measures

Run Project Summary Report

TMDL/303d Projects
Implement TMDL
Middle Trempealeau TMDL
2002
Complete
 
Reports and Documents
Trempealeau Mountain and the Mississippi River
Final TMDL Report
 
Activities & Recommendations
TMDL (USEPA) Approved
Welch Coulee Creek in the Middle Trempealeau River TMDL
TMDL (USEPA) Approved
Irvin Creek (1792200) in the Middle Trempealeau River TMDL
TMDL (USEPA) Approved
Newcomb Valley Creek in the Middle Trempealeau River TMDL
TMDL (USEPA) Approved
Swinns Valley Creek in the Middle Trempealeau River TMDL
TMDL (USEPA) Approved
Tappen Coulee Creek in the Middle Trempealeau River TMDL
TMDL (USEPA) Approved
North Creek in the Middle Trempealeau River TMDL
 
Waters