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<br /> <br />Mississippi River Dam Modifications <br />Design, Analysis, and Permitting <br /> <br /> <br />..J <br /> <br />Project Tasks: <br /> <br />- Design modifications to an earth dam along the Mississippi River <br />- Perform stability analysis <br />- Perform liquefaction analysis <br />- Design surface water and drainage systems <br />- FERC permitting <br />- Develop quality control inspection plan <br />- Prepare plan and specification preparation <br />- Assist with construction observation and testing <br /> <br />Project Description: <br /> <br />The Lower St. Anthony Falls hydropower plant along the Mississippi River in <br />Minneapolis was undermined in the 1980s. Emergency measures were <br />implemented to construct an earth dam across the river to restore upstream river <br />levels and barge traffic. <br /> <br />Polaris Group recently designed dam modifications to allow the site to blend into <br />the surrounding river and planned park development. These measures included <br />grading and fill placement on the downstream side, seepage collection systems, <br />and surface water control. The grading operations were performed using dredge <br />material to minimize construction costs. <br /> <br />Polaris Group reviewed the existing dam and performed a stability and <br />liquefaction analysis. ARemative development plans were prepared and <br />construction plans and specifications were completed for the selected option. <br />The stability and liquefaction analysis, construction plans and specifications, and <br />a quality control plan were submitted to FERC and approved. <br />