Minnesota's Impaired Waters and TMDLs
Dissolved oxygen impairment. Shingle Creek (reach 07010206-506) was placed on Minnesota’s 2004 303(d) list because it is impaired for aquatic life due to low dissolved oxygen (DO) levels. The monitoring data indicates that Shingle Creek frequently has DO concentrations below the state water quality standard of 5 mg/L.
Macroinvertebrates are organisms that are large (macro) enough to be seen with the naked eye and lack a backbone (invertebrate).
Biotic impairment. In 2006, Shingle Creek was placed on Minnesota’s 303(d) list because it is impaired for aquatic life due to stressors impacting the aquatic macroinvertebrate community. Bass Creek was placed on Minnesota’s 2002 303(d) list because it is impaired for aquatic life due to stressors impacting the fish community. The Minnesota Pollution Control Agency (MPCA) uses an Index of Biotic Integrity (IBI) to evaluate the biological health of streams in the state.
The Clean Water Act requires a Total Maximum Daily Load (TMDL) report to be completed for each impaired waterbody. The main objectives of this project are to determine the causes of the dissolved oxygen and biotic impairments and estimate the pollutant reductions needed in order for Shingle and Bass Creeks to meet state water quality standards. The main project deliverables are a stressor identification report for the Shingle and Bass Creek biological impairments and a Shingle and Bass Creek TMDL that addresses the pollutants causing both the DO and biological impairments.
Map and location
Shingle and Bass Creeks are located in the Twin Cities metro area in Hennepin County. The creeks are in the Mississippi River - Twin Cities watershed of the Upper Mississippi River basin. The creeks are also within the Shingle Creek watershed which includes the municipalities of Brooklyn Center, Brooklyn Park, Crystal, Maple Grove, Minneapolis, New Hope, Osseo, Plymouth, and Robbinsdale. Lower Bass Creek starts at the outlet of Bass Lake in Plymouth and travels about 2.4 miles before it flows into Shingle Creek. Shingle Creek begins at the junction of Bass Creek and Eagle Creek in Brooklyn Park, flows easterly, then southerly for about 11 miles through Brooklyn Center and Minneapolis before discharging into the Mississippi River. The Shingle Creek watershed is almost entirely developed and the largest land use classification is single family residential at 44%.
More maps are available on the TMDL maps page.
Status: Phase I of this project included the following tasks (February 2007 - June 2009):
- DO monitoring including completion of a travel time study, two synoptic surveys, and continuous measurements;
- Development of a Technical Memorandum analyzing DO data and a conceptual model examining the potential causes of the biotic impairments; and
- Collection of additional macroinvertebrate and fish data.
Phase II of this project includes the following tasks (February 2008 - June 2011):
- Assessment of pollution loading and development of TMDL equations to determine pollutant reductions;
- Creation of a Stressor Identification Report identifying the likely causes of the biotic impairments; and
- Development of a Shingle and Bass Creeks TMDL Report which includes potential implementation actions.
TMDL report and implementation plan
- Stressor ID Report (wq-iw11-11n)
- Final TMDL Report (wq-iw11-11e)
- EPA Approval Letter (November 4, 2011) (wq-iw11-11g)
- Shingle and Bass Creeks Biota and Dissolved Oxygen TMDL Implementation Plan (January 30, 2012) (wq-iw11-11c)
- Local Sponsor: Shingle Creek Watershed Management Commission
- Lead Consultant: Wenck Associates, Inc
- Basins in Minnesota
Minnesota Pollution Control Agency
520 Lafayette Road N
St. Paul, MN 55155