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National Dam Safety Program. Star Mine Dam (MO 31005), Mississippi - Kaskaskia - St. Louis Basin, Washington County, Missouri. Phase I Inspection Report.

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Final rept.,

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This report assesses the general condition of the dam with respect to safety, based on available data and on visual inspection, to determine if the dam poses hazards to human life or property. The St. Louis District, Corps of Engineers SLD has classified this dam as having a high hazard potential. Hydrologichydraulic studies indicate the spillway will pass the one percent probability-of-occurrence flood 100 yr flood without overtopping of the dam. These analyses also indicate that the dam will be overtopped for a hydrologic event which produces greater than 90 percent of the Probable Maximum Flood PMF. The inspection and evaluation indicate the dam is in generally fair condition. Slope movements have taken place in the embankment but have apparently ceased within the past five to ten years. Depressions were noted in the dam crest above the slumped areas settlement of te dam is a possible cause for the depressions. Some gully erosion is taking place but at present does not appear to affect the safety of the dam. The spillway and downstream channel are obstructed by rock pinnacles, some large trees, two access roads, a trash pile and a piece of mining equipment. Seepage and stability analyses comparable to the requirements of the Recommended Guidelines for Safety Inspection of Dams were not available, which is considered a deficiency.

Subject Categories:

  • Hydrology, Limnology and Potamology
  • Civil Engineering

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