Waters Edge Estates Lake Dam is located in Boone County in the State of Missouri, and crosses the Hominy Branch tributary of Hinkson Creek. The dam was constructed to impound water for recreational purposes. The exposed embankment did not have adequate protective grass cover at the time of inspection. Small rivulets and minor shrinkage cracks were observed on the embankment. There is a cut at the downstream toe exposing a 5-foot high vertical face. The materials exposed in the cut face appear to be moderately plastic sandy clay overlaying the foundation soils and shale stratum. The upstream slope has no riprap protection or grass cover. Consequently, surface erosion of the loose surficial material has taken place. In addition, some minor wave erosion of the face has taken place. The dam material, exposed on the upstream face and removed from below the water line, appears to be light brown, moderately to highly plastic clay.

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. This dam has been classified as unsafe, non-emergency by the St. Louis District as a result of the application of the following criteria: (1) Spillway will not pass 50 percent of the Probable Maximum Flood; (2) Overtopping could result in dam failure; and (3) Dam failure significantly increases the hazard to loss of life downstream.

This report was prepared under the National Program of Inspection of Non-Federal Dams. 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. (Author).

Moores Lake dam is located in Boone County in the State of Missouri, and crosses an unnamed tributary of Bear Creek. The reservoir is used as a settling pond for the cinders and ash which are a by-product of the Municipal Power Plant. Originally, when the power plant was first put into operation, the lake was used as a source of cooling water for the plant, however, thIt is no longer the case. This is evidenced by the fact that a recreational platform still exists at the eastern edge of the lake. The top of dam has a grass cover which adequately protects the embankment material from surface erosion. The grass was mowed at the time of our inspection and, is mowed periodically. The irregularity in the top of dam is apparently due to the addition of on site spoils materials in the past and not due to settlements. Is is unknown whether or not the dam has ever been overtopped; however, no evidence was observed indicating that the dam had been overtopped. The upstream slope has no riprap protection and although the grass cover is dense, it has been eroded by wave action. Nearly vertical faces up to 3 feet high are exposed with a nearly horizontal bench at the water line. The material exposed on these faces is a low plasticity clay with a trace of gravels. The upstream slope also has medium-sized trees and large bushes growing on it.

DeMarco 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 not meet the criteria set forth in the guidelines for a dam having the above size and hazard potential. The spillway will not pass 50 percent of the probable maximum flood without overtopping but will pass 15 percent of the probable maximum flood. The spillway will not pass the flood which has a one percent chance of occurrence in any given year (the 100-year flood). The spillway design flood recommended by the guidelines is 50 to 100 percent of the probable maximum flood. Considering the volume of water impounded behind the dam 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.

Welch Lake Dam was inspected 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 that the spillways do not meet the criteria set forth in the guidelines for a dam having the above size and hazard potential. The spillways will not pass the probable maximum flood without overtopping but will pass 4 percent of the probable maximum flood. The spillways will not pass the flood which has a ten percent chance of occurrence in any given year (10-year flood). The spillway design flood recommended by the guidelines is 50 to 100 percent of the probable maximum flood. Considering the damage zone and the reservoir storage volume, 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.