Missouri Missouri Grand Chariton Basin Lake Marie Dam Mercer County Missouri Phase 1 Inspection Report National Dam Safety Program PDF Download

The purpose of the inspection was to make an assessment of the general condition of the dam with respect to safety, based upon available data and visual inspection, in order to determine if the dam poses hazards to human life or property. The inspection and evaluation indicates that the spillway does not meet the criteria set forth in the guidelines for a dam having the above size and hazard potential. The spillway will pass 46% of the Probable Maximum Flood without overtopping the dam. The Probable Maximum Flood (PMF) is defined as the flood that may be expected from the most severe combination of critical meteorologic and hydrologic conditions that are reasonably possible in the region. An additional deficiency, in accordance with the guidelines, is the lack of seepage analysis. These analyses should be obtained in the future. Other deficiencies visually observed by the inspection team were spalling of spillway concrete, open joints in the spillway, some deterioration of riprap, bank erosion at the end of the spillway stilling basin and erosion in a few small areas on the upstream slope.