Mitchell Lake Subwatershed Assessment
The Riley-Purgatory-Bluff-Creek Watershed District and the City of Eden Prairie are working together to implement projects to remove Mitchell Lake from the impaired waters list. One key emerging issue is to evaluate potential internal phosphorous loading within stormwater ponds in the lakes? subwatersheds. This project will also use updated pond data from the city?s intensive pond inspection program to identify other phosphorus reduction opportunities. The proposed assessment will quantify formerly undocumented P loading to Mitchell Lake.
The Riley-Purgatory-Bluff-Creek Watershed District (RPBCWD) and the City of Eden Prairie (City) are working together to implement projects to remove Mitchell Lake from the impaired waters list. A primary objective in the RPBCWD's plan is to identify opportunity projects based on emerging science and additional assessment. One key emerging issue is to evaluate potential internal phosphorous loading within stormwater ponds in the lakes' subwatersheds. The adaptive management strategy proposed in this application will target opportunity projects to assess the contribution of internal loading in storm water ponds, an emerging issue in urban stormwater systems. Further, this project will develop an internal load strategy and cost for Lake Mitchell, a previously identified issue for the lake. This project will also use updated pond data from the City's intensive pond inspection program to identify other phosphorus reduction opportunities. The proposed assessment will quantify formerly undocumented P loading to Lake Mitchell to bolster an improving water quality history which has positioned Mitchell Lake on the verge of being delisted from the MPCA 303d list.
Annie Felix-Gerth
(c) $3,325,000 the first year and $4,275,000 the second year are for accelerated implementation, including local resource protection and enhancement grants and statewide program enhancements of supplements for technical assistance, citizen and community outreach, compliance, and training and certification.
Achieve an estimate 239 lb/yr of phosphorous in surface water through identification effective treatment of internal P loading within the subwatershed.
The grant funds funded the subwatershed assessment to be completed for Mitchell Lake which included an identification of practices and locations. The practices identified would result in a reduction of 239 lb/yr of total phosphorus when implemented.
LOCAL LEVERAGED FUNDS