Crystal, Keller, Lee, and Earley Lakes were listed on the Minnesota Pollution Control Agency's 303(d) Impaired Waters List in 2002 as impaired for aquatic recreation due to excess nutrients (phosphorus). Excess phosphorus from stormwater runoff creates poor water quality conditions and causes summer algal blooms, which limit lake recreational activities such as swimming.
These lakes are in the cities of Burnsville, Lakeville, and Apple Valley. The lakes are between 19 and 292 acres in size, with a combined watershed of approximately 5,000 acres, and part of the Black Dog Watershed Management Organization. The land area is almost completely developed, and the main land uses are low density residential, highway, and commercial development.
When lakes and rivers are polluted with phosphorus, sediment, and other contaminants, it can take years of effort and expense to restore water quality. But this restoration work is having an impact.
Map and location
Crystal Lake (cities of Burnsville and Lakeville), Keller Lake (Burnsville and Apple Valley), Lee Lake (Lakeville), and Earley Lake (Burnsville) are located in the southern Twin Cities metro area in Dakota and Scott counties. The lakes lie in the Black Dog sub-watershed in the Lower Minnesota River watershed of the Minnesota River and Lower Mississippi River basins.
TMDL report and implementation plan
- Crystal, Keller, Lee and Earley Lakes TMDL Project - Final TMDL Report
- Crystal, Keller, Lee and Earley Lakes TMDL Project: EPA approval letter (Sept. 2011)
- Crystal, Keller, Lee and Earley Lakes TMDL: Implementation Plan (November 3, 2011)
- Minnesota’s impaired waters and TMDLs
- Black Dog Watershed Management Organization
- Barr Engineering Company
- Apple Valley
- Dakota County
Tim Schwarz, firstname.lastname@example.org or 651-757-2426