The dam is an earth structure built in the uplands of Sehrt Creek, 2-1/2 miles from the edge of the Missouri River Valley. There is no principal spillway. There are two emergency spillways. At the east end is an emergency spillway about 180 feet long on a flat grade in virgin soil approximately 50 feet wide and 3 feet deep. At the west end is a smaller capacity spillway which is a dip in a road with low point more than 2 feet higher. Our inspection and evaluation indicates the dam is deficient in that the spillways are inadequate. The guidelines for a dam having the above size and hazard potential require that the spillway be capable of passing a one-half PMF (Probable Maximum Flood). A 25% PMF will begin to overtop the dam. The dam and spillways are adequate to contain the 100-year flood. Our inspection and evaluation indicate significant tree and underbrush growth on both faces of the dam which could lead to conditions causing rupture of the dam. Other deficiencies found are lack of erosion protection on the upstream slope of the dam, no effective erosion protection on the spillways and lack of seepage and stability analyses records.

No-Name 207 dam was inspected. 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 that the dam is deficient in that the spillways do not meet the criteria set forth in the guidelines for a dam having the above size and hazard potential and which require that the spillway be capable of passing a one-half PMF (Probable Maximum Flood). The probable maximum flood is defined as the flood discharge that may be expected from the most severe combination of critical meteorological and hydrologic conditions that are reasonably possible in the region. The dam will begin to be overtopped by a flood having a discharge (peak and volume) equal to 20% of the PMF. The spillways will pass a 1% chance flood (100-year flood) without overtopping, which is a flood that has a 1% chance of being exceeded in any given year.

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Robert Schultehenrich dam was inspected. 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. Failure would threaten the life and property of three families and cause appreciable damage to associated farm buildings and one power transmission line. Our inspection and evaluation indicates the dam is deficient in that the spillways are inadequate. Considering the small volume of water impounded, the large floodplain downstream and the three groups of farm buildings downstream, one-half PMF is the appropriate spillway design flood. The dam will begin to be overtopped by a 10% PMF. The dam will also be overtopped by a 100-year frequency flood. Other deficiencies observed were steep downstream slope, lack of wavewash protection on the upstream face of the dam, lack of erosion protection in the emergency spillway, heavy growth of trees on the slopes of the dam and lack of seepage and stability analyses records.

The dam is an earth structure built in a narrow draw in the uplands of the Missouri River Bluffs. An 8-inch steel pipe (principal spillway) is provided to drain off excess water from the lake. Additional spillways (emergency spillways), flat channels excavated in earth, are provided at each abutment. Our inspection and evaluation indicates that the spillway does not meet the criteria set forth in the guideilnes for a dam having the above size and hazard potential. The dam will begin to be overtopped by a flood having a discharge (peak and volume) equal to 35% of the PMF. The dam storage and principal spillway will contain a 1% chance flood (100-year flood) without overtopping the emergency spillway. Other deficiencies observed by the inspection team were tree growth starting on the downstream face, and shallow erosion channels on the downstream face and at the toe of the dam on the west slope.

No-Name 447 dam was inspected by an interdisciplinary eam 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. Failure would threaten the life and property of ten families and cause appreciable damage to one county road. Our inspection and evaluation indicates that the dam is deficient in that the spillways do not meet the criteria set forth in the guidelines for a dam having the above size and hazard potential and which require that the spillway be capable of passing a one-half PMF (Probable Maximum Flood). The probable maximum flood is defined as the flood discharge that may be expected from the most severe combination of critical meteorological and hydrologic conditions that are reasonably possible in the region. The dam will begin to be overtopped by a flood having a discharge (peak and volume) equal to 25% of the PMF. The spillways will pass a 1% chance flood (100-year flood) without overtopping, which is a flood that has a 1% chance of being exceeded in any given year.

The dam is an earth structure built in the upper end of a (draw) in the hilly ground along the Missouri River on the fringes of the loess blown in from the river bottom. A spillway was cut into the earth slope on the northeast end of the dam. At some time, a concrete sill was constructed across the spillway channel about 20 feet downstream from the centerline of the dam apparently to control erosion of the spillway bottom. Our inspection and evaluation indicates that the spillway meets the criteria set forth in the guidelines for a dam having the above size and hazard potential. The principal spillway will pass a one-half Probable Maximum Flood without overtopping the dam. Our inspection and evaluation indicates heavy tree growth on both faces of the dam which could lead to conditions causing rupture of the dam. Other deficiencies were inadequate erosion protection of the upstream slope of the dam and spillway and lack of knowledge of the location and condition of a pipe reported to be under or through the dam.

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).