National Dam Safety Program. Liguori Lake Dam (No Name 255) (MO 30445), Mississippi - Kaskaskia - St. Louis Basin, Jefferson County, Missouri. Phase I Inspection Report.
Abstract
The dam is in the high hazard potential classification, which means that loss of life and appreciable property loss could occur in the event of failure of the dam. In accordance with the inspection guidelines, a dam of this classification, namely small size classification and high hazard potential classification, must have a spillway capable of passing 50 percent of the Probable Maximum Flood (PMF) without overtopping the dam. Since the spillway of this dam will pass only 25 percent of the PMF without overtopping the dam, and since overtopping of the dam could cause breeching due to erosion it is classified as an unsafe non-emergency structure. Also, our evaluation indicates that the spillway will not pass the 100-year flood, that is a flood having a 1 percent chance of exceedence in any given year. The spillway area immediately downstream of the paved overflow section does not appear sufficiently resistant to prevent embankment erosion at high flows for an indefinite time. See page and stability analyses are not on record as recommended in the guidelines which is considered a deficiency which sould be reconciled. The valve on the 4-inch pipe through the dam is not operable and should be repaired/replaced.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1978
- Accession Number
- ADA104766
Entities
People
- Arthur L. Johnson
Organizations
- St. Louis District, U.S. Army Corps of Engineers