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.

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Hauck Lake Dam is located in Callaway County of the State of Missouri on an unnamed tributary of Stinson Creek, about 2 miles west of the city of Fulton. The dam was built primarily for recreational purposes. The overall condition of the dam appeared to be fair. However, some items of concern were observed. The top of the dam is adequately protected against surface erosion by an unmaintained vegetative cover. The top of the dam is used occasionally as a farm road and consequently, tire tracks due to vehicular traffic were observed. No tire ruts or depressions which are sometimes associated with vehicular traffic across earthen structures were observed. Some noncontinuous longitudinal and transverse cracks were measured up to 4 inches deep and 1/4 of an inch wide. No depressions indicating localized settlement of the dam were observed. No misalignment in either the vertical or horizontal directions was apparent. No evidence was observed indicating that the dam has ever been overtopped.

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).

The dam is an earthfill structure approximately 13 feet in height and 717 feet in length constructed in an L shape with about 227 feet extending across the old channel on the south end and about 490 feet extending parallel to the railroad along the east side. The spillway consists of a reinforced concrete weir and ogee chute and apron section located on the right end of the south leg of the dam. The weir section is 163 feet wide. Our inspection and evaluation indicates that the spillway does not meet the criteria set forth in the recommended guidelines for a small dam having a high hazard potential. The spillway will pass 10% of the Probable Maximum Flood (PMF) without overtopping the dam. Junior Lake Dam is in very poor condition and has a serious potential of failure due to severe erosional damage of the upstream face and the crest; rodent burrows; dense tree and brush growth on the crest and downstream slope; and a severely inadequate spillway. There apparently has been little maintenance work done on this dam.

This dam appears to be in satisfactory condition. However, the dam does not have adequate spillway capacity. Considering the number of inhabited dwellings, a state highway and an oil depot being located downstream of the dam, the PMF is considered the appropriate spillway design flow for A.C. Schneider Lake Dam. The inspection and evaluation indicates that the reservoir/spillway system can accommodate approximately 5 percent of the Probable Maximum Flood without overtopping the dam. It also indicates that the reservoir/spillway system can not accommodate the one-percent chance flood without overtopping, however, the reservoir/spillway system of A.C. Schneider Lake Dam can accommodate the ten-percent chance flood without overtopping. Other deficiencies noted by the inspection team were: the erosion gully along the downstream left abutment/embankment contact, the trees on the downstream and upstream slope of the dam, wave erosion on the upstream slope, the unsupported length of the principal spillway pipe at the outlet, the eroded gulley in the emergency spillway channel, some vegetative growth around the principal spillway inlet, a need for periodic inspection by a qualified engineer and a lack of maintenance schedule. The lack of seepage and stability analyses on record is also a deficiency that should be corrected.

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.