Jackson County, Wisconsin
BR06
1711500
38.03
Water is impaired due to one or more pollutants and associated quality impacts.
Notes
Total phosphorus causing elevated pH and eutrophication in Trow Lake . 2010 Lakes assessment found this shallow lowland lake to be eutrophic. Condition assessment indicated "good" but this was based satellite data. Site specific documentation indicates that this lake is considered "poor" condition.Pollutant
Total Phosphorus
Listed For
Fish and Aquatic Life
Impairments
Elevated pH , Eutrophication
Current Use
Unsupported Aquatic Life
Listing Status
303d Listed
Attainable Use
WWSF - Warmwater Sport Fishery
Priority
Low
Designated Use
WWSF - Warmwater Sport Fishery
303(d) ID
491
Listing Date
4/1/1998
Impaired Water Notes
2002 data documentation sheet indicated eutrophication and pH exceedances and undesirable algae growth from nutrient enrichment due to
NPS, Point Source, and agricultural land spreading. Water quality monitoring conducted during summer 1992 found pH levels at the surface above 9.0 on two of three dates sampled. No new data as of 6/2/2008 Date Reviewed: 3-5-02, revised 12/22/03 by Ken Schreiber; reviewed 6/2/2008 by Mark Hazuga.
Water quality monitoring conducted during the summer of 2008 found average total phosphorus concentrations greater than 110 ug/l and average chlorophyll a concentrations near 9 ug/l. The Carlson TSI value for chlorophyll a is 52 indicating excellent water quality even though total phosphorus concentrations were high. The average total phosphorus concentration found in 1992 was 124 ug/l and was slightly higher than the concentration found in 2008. The chlorophyll TSI value in 1992 was 72 indicating poor water quality even though total phosphorus concentrations were similar between survey years. The lower chlorophyll a concentration in 2008 may be a function of decreased residence time in Trow Lake during 2008 or the absence of algae being discharged to Trow Lake from upstream Oakwood Lake. Oakwood Lake is an impoundment on Halls Creek approximately one mile upstream from Trow. The lake was drawn down during the summer of 2008 for dam repair. Algae growth would have been absent without the impounding effect of the dam. A more detailed analysis and review of local climatic data would be needed to determine if the residence time in Trow was decreased by higher streamflow.
Date
3/18/2010