Accession Number:

ADA106631

Title:

National Dam Safety Program. Sweetwater Dam (Noname 251) (MO 30436), Mississippi - Kaskaskia - St. Louis Basin, Jefferson County, Missouri. Phase I Inspection Report.

Descriptive Note:

Final rept.,

Corporate Author:

ARMY ENGINEER DISTRICT ST LOUIS MO

Personal Author(s):

• Johnson,Arthur L.

Report Date:

1978-12-01

Pagination or Media Count:

40.0

Abstract:

This report assesses the general condition of the dam with respect to safety, based on available data and on visual inspection, to determine if the dam poses hazards to human life or property. 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. For its size and hazard category, this dam is required by the guidelines to pass one-half PMF to the PMF. The spillway of this dam will pass only 20 percent of the PMF without overtopping the dam. Since the spillway for Sweetwater Dam is not capable of passing a minimum of one-half 50 percent of the PMF without overtopping the dam, the spillway is considered inadequate. The inspection team observed heavy tree growth covering the downstream slope of the dam and spillways. Potential exists for other deficiencies such as rodent holes to be found after the trees and brush have been removed. The downstream slope of the dam was eroded considerably in the area of the right abutment where flow from the right spillway has occurred int he past. Seepage and stability analyses are not on record as recommended in the guidelines, which is considered a deficiency that should be rectified.

Descriptors:

• *EARTH DAMS
• STABILITY
• HYDROLOGY
• DEFICIENCIES
• SAFETY
• VISUAL INSPECTION
• FLOODING
• RESERVOIRS
• MISSOURI

Subject Categories:

• Hydrology, Limnology and Potamology
• Civil Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE