In 2006, the District completed construction on three stormwater detention ponds near Minnetoga Lake. In addition, the District upgraded two ponding areas into stormwater detention ponds. The goal of this project was to reduce phosphorus entering Minnetoga Lake.
District monitoring found that transparency was getting worse in Minnetoga Lake. Despite this deterioration, the District continued to classify this lake in the healthiest category. The healthiest category for lakes supports swimming and fishing, among other activities. In order to prevent further degradation, the District implemented the Minnetoga Lake project. The project provides increased stormwater treatment of runoff before it enters the lake.
The project implemented the following:
- Construction of a stormwater detention pond on both the east and west sides Baker Road, north of Rogers Road
- Construction of a stormwater detention pond on the west side of Minnetoga Lake
- Upgrade of an existing runoff ponding area to a stormwater detention pond on the northwest side of Merilee Drive
- Upgrade of an existing runoff ponding area to a stormwater detention pond near Jane Lane
The Minnetoga Lake project was part of the larger Minnetonka Lakes Water Quality Improvement Project. The Use Attainability Analysis (UAA) for Minnetoga Lake guided the development of this project.
Water Quality Impact
The water quality impacts of this project are improved treatment of stormwater runoff before it enters Minnetoga Lake. The additional stormwater treatment results in reduced phosphorus concentrations in the lake and improved water clarity.