National Dam Safety Program. Trenton Lower Lake Dam (MO 10366), Grand - Chariton Basin, Grundy County, Missouri. Phase I Inspection Report

摘要

The dam is an earth fill approximately 5700 feet in length with a maximum height of about 20 feet. The dam is constructed on three sides of a square and impounds discharges from Trenton Upper Lake. The reservoir covers about 105 acres of nearly level bottomland adjacent to the east side of Muddy Creek on the eastern outskirts of Trenton, Missouri. The spillway consists of an ungated concrete chute with an 8 foot bottom width. The spillway is located in the west leg of the dam some 700 feet north of the southwest corner of the dam. Our inspection and evaluation indicates that the spillway does not meet the criteria set forth in the recommended guidelines for an intermediate dam having a high hazard potential. The Probable Maximum Flood is the appropriate spillway design flood. The spillway will pass the 100-year flood (flood having a one percent chance of being exceeded in any year) without overtopping the dam. The spillway will pass 55% of the Probable Maximum Flood without overtopping the dam.