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<br /> <br />Prairie Island Marina <br /> <br /> <br />Prior to starting Polaris Group, Joel Toso, while employed by another company, provided <br />consulting engineering services related to establishing the Prairie Island Marina on the <br />Mississippi River near Red Wing, Minnesota. Services included: preparing permit <br />applications to the Corps of Engineers and the MnDNR; hydraulic dredging considerations; <br />water quality considerations; anchoring for the marina; plans and specifications for the <br />marina construction; ice/debris barrier design; marina deicing design; and contract <br />administration. The following project tasks were completed by Polaris Group. <br /> <br />Project Tasks: <br />- 2-dimensional modeling of Sturgeon Lake and Buffalo Slough segments of <br />Mississippi River <br />- Measure inflow into Sturgeon Lake from Buffalo Slough <br />- Observe flow patterns in upper reach of Sturgeon lake <br />- Model jetti alternatives to minimize debris and sedimentation and wave impacts <br />to Marina <br />- Allow for potential future slip expansion and determine optimum location for boat <br />launch <br /> <br />Project Description: <br />The Prairie Island Marina, along the Mississippi River, had problems with sediment <br />deposition, debris accumulation, and waves. In addition, the marina wanted to enhance <br />the general operation of the Marina and expand the number of slips. <br /> <br />Polaris Group used a 2-dimensional hydrodynamic model of the River to review the existing <br />problems and to develop corrective alternatives. The modeling reviewed the flow <br />conditions into the marina area (Sturgeon Lake) from the upstream Buffalo Slough. The <br />model also evaluated the effectiveness of various jetti alternatives and was used to design <br />these systems. An upstream jetti was designed to control debris. A downstream jetti was <br />used to minimize wave impacts on the docks. <br /> <br />This work involved field investigation and field measurement of flows for model calibration. <br />