National Dam Safety Program. Lake Sainte Louise Dam (MO 10490), Mississippi - Kaskaskia - St. Louis Basin, St. Charles County, Missouri. Phase I Inspection Report

摘要

Various deficiencies were noticed during the inspection and are considered to have an adverse effect on the overall safety and future operation of the dam. Several inches of subsidence or erosion of the downstream slope of the dam, along the alignment of the 12-inch discharge pipe for the 42-inch diameter drop inlet spillway located near the center of the dam, was observed. Minor wearing away at the waterline of the upstream face of the dam was noticed. The condition is not considered serious at this time but continued erosion of this slope will reduce the dam cross section. At the time of the inspection, it could not be determined if the 10-inch sanitary sewer passing beneath the dam can be isolated if necessary in order to prevent loss of foundation soils, should collapse of the sewer beneath the dam occur. Voids resulting from loss of materials into the sewer will provide a passageway for seepage that may develop into a piping condition and subsequent failure of the dam.