Accession Number:

ADA106589

Title:

National Dam Safety Program. Hornsey Lake Dam (MO 30688), Mississippi - Kaskaskia - St. Louis Basin, Washington County, Missouri. Phase I Inspection Report.

Descriptive Note:

Final rept.,

Corporate Author:

HORNER AND SHIFRIN INC ST LOUIS MO

Personal Author(s):

Report Date:

1978-12-01

Pagination or Media Count:

46.0

Abstract:

The purpose of the inspection was to assess the general condition of the dam with respect to safety and, based upon this inspection and available data, determine if the dam poses a hazard to human life or property. The following deficiencies were noticed during the visual inspection and are considered to have an adverse effect on the overall safety and future operation of the dam and spillway A dense cover of small- to medium-size trees and brush that may conceal animal burrows exists on the upstream face of the dam. The upstream face of the dam is in an unkept state. The crest width of the dam is non-uniform and varies from approximately 60 feet to more than 100 feet. The course of the spillway outlet channel is not readily discernible due to the existence of dense brush and trees that begin at the end of the spillway control section. This dam, which is classified as intermediate in size and of high hazard potential, is specified to be the Probable Maximum Flood PMF. Results of a hydrologichydraulic analysis indicated that the existing spillway is inadequate to pass the lake outflow resulting from a storm of PMF magnitude without overtopping the dam. The length of the downstream damage zone, should failure of the dam occur, is estimated to be six miles.

Subject Categories:

  • Hydrology, Limnology and Potamology
  • Civil Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE