National Dam Safety Program. Slime Pond Dam (MO 30611), Mississippi - St. Francis Basin, Madison County, Missouri. Phase I Inspection Report.
Abstract
Slime Pond Dam is an earth dam constructed in the 1950's to impound tailings and water from a lead ore processing mill. It consists of a long, curved earth embankment, convex downstream, spanning a wide, relatively flat drainage basin. The crest of the dam is approximately 2430 ft long. There is no spillway. The lake level is controlled by a concrete intake tower which was part of the decant system. The overflow from the intake tower flows through a conduit installed through the embankment, exiting at the downstream toe of the dam through a concrete pump house. Our visual inspection and evaluation of available information indicate the dam is in generally poor condition. No evidence was noted of cracking, slumping, sinkhole development, animal burrows, or disruption of the vertical or horizontal alignment of the dam crest. However, the downstream slope of the embankment is steep, on the order of 1.4(H) to 1(V) and may be subject to slumping. Large trees, to 12-in. in diameter are growing on the downstream slope and could provide piping paths or voids in the embankment if they are cut, die or are blown down. Hydraulic/hydrologic analyses indicate the dam will be overtopped by a flood which produces greater than 40 percent of the Probable Maximum Flood.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1981
- Accession Number
- ADA105289
Entities
People
- Jean-yves Perez
- Richard G. Berggreen