Empirical modeling of Lake Tomah - WCR_04_CMP15


Tomah Lake in Monroe County was dredged in 1992 and 1993 which led to the introduction of common carp. The carp population grew to an overabundant level causing poor water quality, and the decimation of the aquatic plant and game fish populations. A Rotenone treatment, drawdown and fish restocking were carried out in 2010 in order to remove the carp population. These treatments led to improvements in water quality and the aquatic plant community in 2011 and 2012. In 2013 algal blooms returned and continue to dominate this lake. These frequent algal blooms have caused light limitation on the aquatic plant community. The maximum rooting depth has gone from 10 feet in 2011 to 6 feet in 2014. The frequency of occurrence of vegetation has gone from 37% in 2011 to 9% in 2014. Tributary flow and in-lake water chemistry data were collected from September 2010 to September 2012. These data need to be analyzed to determine the source of the high phosphorus levels.


This project will fund a contracted analyst to apply the empirical modeling suite BATHTUB to Lake Tomah from the monitoring years September 2010 through September 2012 .This model will be used to determine background and watershed nonpoint source phosphorus loads.


A report of results of analysis will be produced and delivered to WDNR.

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WCR_04_CMP15 status 10 14 2016