National Dam Safety Program. Great Midwest Lake Dam (MO 11024), Missouri - Kansas City Basin, Clay County, Missouri. Phase I Inspection Report.

Great Midwest Lake Dam was inspected by a team of engineers. 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. Our inspection and evaluation indicates the spillway does meet the criteria set forth in the guidelines for a dam having the above size and hazard potential. The spillway will pass both the probable maximum flood and the one percent probability flood (100-year flood) without overtopping. The spillway design flood recommended by the guidelines is 50 to 100 percent of the probable maximum flood. Considering the small volume of water impounded behind the dam, the presence of a lake below the dam with at least 350 acre-feet of storage capacity, and the hazard zone, the spillway design flood should be 50 percent of the probable maximum flood. The probable maximum flood is defined as the flood discharge which may be expected from the most severe combination of critical meteorologic and hydrologic conditions which are reasonably possible in the region.