Fish Lake TMDL and Schwanz Lake Nutrient Management Plan - Excess Nutrients: TMDL Project

New TMDL project for Eagan lakes

Efforts by the city of Eagan have improved water quality in Schwanz Lake, and MPCA removed the lake from the impaired waters list. To address the impaired Fish Lake, a TMDL was completed and approved by EPA in 2010.

Eagan neighborhood lakes. A subsequent project under the Clean Water Partnership grant program was launched in 2012 to address several impaired lakes (Carlson, Fitz, Holz, and LeMay) and several lakes that are not on the impaired waters list but warrant protection (Bald, Bur Oaks, Cliff, Hay, LP-30, North, O'Leary, and Quigley. The project has produced a draft report that contains detailed plans for implementation to restore and protect the subject lakes.

Minnesota's Impaired Waters and TMDLs

TMDL Project: Fish Lake TMDL and Schwanz Lake Nutrient Management Plan - Excess Nutrients


Fish and Schwanz Lakes, located in Eagan, are 29 and 12 acres respectively. The lakes and their surrounding drainage areas are in the Gun Club watershed. Both lakes are located in prominent city parks, which provide good public access for fishing, non-motorized boating, aesthetic enjoyment, and some swimming and wading.

In 2006, the Minnesota Pollution Control Agency (MPCA) listed Fish and Schwanz Lakes as impaired for aquatic recreation under Section 303(d) of the Clean Water Act. The main cause for this impairment is excess nutrients in the lakes. Excess nutrients such as phosphorus from stormwater runoff create poor water quality conditions causing summer algal blooms, which limit recreational activities. Efforts by the city of Eagan have improved water quality to Schwanz Lake in recent years, and MPCA will likely remove the lake from the impaired waters list, although the city intends to implement additional water quality improvement projects.

The main objectives of this project are to determine the sources of the excess nutrients and to estimate the reductions in nutrient loadings that are needed in order for Fish Lake to meet the appropriate water quality standard and to improve water quality in Schwanz Lake. The end product of this project will be a Fish Lake Total Maximum Daily Load (TMDL) and Schwanz Lake Nutrient Management Report and Implementation Plan. The city of Eagan worked with Bonestroo to prepare the reports for the MPCA.

Map and location

Fish and Schwanz Lakes are located in Eagan (Dakota County), in the southern Twin Cities metro area. The lakes lie in the Gun Club sub-watershed of the Lower Minnesota River watershed in the Minnesota River Basin.


TMDL report and implementation plan

Other documents


Information contact

Chris Zadak, Project Manager
Minnesota Pollution Control Agency
520 Lafayette Road
St. Paul, MN 55155

Eric Macbeth
Water Resources Coordinator
City of Eagan
3501 Coachman Point
Eagan, Minnesota 55122
651- 675-5300