Stubbs Bay Ravine Stabilization
The Stubbs Bay Ravine Stabilization project was funded in primarily by a grant from the Clean Water, Land, and Legacy Fund. Read the Clean Water Story here.
In 2002, Minnehaha Creek Watershed District (MCWD) Managers authorized an investigation of Stubbs Bay after the city of Orono expressed concerns about its water quality. A feasibility study was published by Barr Engineering Co. in July 2004 (document below). The feasibilty study showed that nutrient loading in Stubbs Bay needed to be reduced to help address and alleviate nuisance algae blooms. After the feasibility study, the MCWD installed and operated five solar-powered circulators known as SolarBees. The SolarBees were in operation during the 2005 and 2006 open water season.
In 2006, a focused feasibility study was completed by Wenck Associates, Inc. (document below). In January 2007, MCWD contracted with Dr. Lorin Hatch from HDR Engineering, Inc. to review and provide comments on the Stubbs Bay feasibility study. After the review of Dr. Hatch's the comments and consultation with the District's engineer and MCWD staff, it was recommended to address the external load reduction projects first. The project that was chosen primarily consisted of excavating a part of Classen Creek known as Swan Lake. Swan Lake provides in- and off-line storage for Classen Creek. Excavation and cleanout of this impoundment provides for increased detention and storage, and reduces downstream sediment and pollutant loading to Stubbs Bay. As a result of this project, the modeled phosphorus showed a reduction of 40 pounds of phosphorus per year, increasing the removal efficiency by approximately 8 percent. Approximately 7,000 cubic yards of material was excavated. The estimated construction cost for the project was approximately $150,000.