National Dam Safety Program. Lake Luna Dam (MO 20076), Missouri - Kansas City Basin, Cass County, Missouri. Phase I Inspection Report.

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 dam is classified as a small size dam with a high downstream hazard potential whose failure would threaten the life and property of approximately eight families, etc. 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 not pass the probable maximum flood without overtopping but will pass 10 percent of the probable maximum flood, which is smaller than the 100-year flood. The spillway design flood recommended by the guidelines is 50 to 100 percent of the probable maximum flood. Considering the fact that there are eight homes within one mile downstream of the dam, 100 percent of the probable maximum flood is the appropriate spillway design flood. Deficiencies visually observed by the inspection team were erosion of the upstream slope due to lack of riprap bedding, presence of a manmade excavation near the downstream toe, erosion undercutting of the discharge channel, and the presence of brush and trees on the downstream embankment slopes.