National Dam Safety Program. Ditch Creek Dam (MO 30726), Mississippi - Kaskaskia - St. Louis Basin, Washington County, Missouri. Phase I Inspection Report.
WOODWARD-CLYDE CONSULTANTS CHICAGO IL
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Ditch Creek Dam, Missouri Inventory number 30726 was inspected. Based on the criteria in the guidelines, the dam is judged to be in the high hazard classification. The St. Louis District, Corps of Engineers SLD has estimated the potential damage zone to extend approximately 13 mi downstream of the dam. The nearest occupied structure is 0.1 mi below the dam but its elevation appears to be above the potential damage zone. Missouri State Highway H crosses the downstream channel 0.1 mi downstream of the dam. The population within the 13 mi damage zone designated by SLD indicates that significant loss of property and life is possible in the event of overtopping and failure of the dam. Ditch Creek Dam is an abandoned barite tailings dam. The dam is in the intermediate size classification based on its maximum height of 60 ft. Our inspection and evaluation indicate the dam is in generally fair to good condition. There is no formal spillway or other outlet facilities at this dam. This is considered a deficiency. A low area to the west of the left dam abutment acts as an informal spillway. This is considered a deficiency. The cohesionless nature of the coarse tailings comprising the embankment indicates the dam could be significantly eroded if overtopped. The hydrologic analysis, however, shows the dam embankment will not be overtopped by a flood with 1 percent probability-of-occurrence or by the Probable Maximum Flood PMF, because the flood waters would pass over the informal spillway.
- Hydrology, Limnology and Potamology
- Civil Engineering