National Program of Inspection of Non-Federal Dams, Tennessee. Portland City Lake Dam (Inventory Number TN 16510), Barren River Basin, near Portland, Sumner County, Tennessee. Phase I Investigation Report,
Abstract
Portland City Lake Dam has an 35.5 acre lake and is located in Sumner County, Tennessee 2.5 miles northeast of Portland, Tennessee and is an earth fill embankment 32.8 feet high and 600 feet long. The crest width is 20 feet. Facilities for discharge from the reservoir are a low level outlet consisting of a 16 inch cast iron pipe through the dam with a valve on the outlet end and a water supply pipe of unknown diameter with a valve located in the lake. The emergency spillway is in the south abutment and consists of a concrete bottom 21 feet wide and layback concrete walls 4 feet high. The spillway is crossed by a road with four 48 inch concrete pipes set on top of the concrete chute to support the road. The embankment slopes are approximately 1V on 3H on the downstream slope and 1V on 3.1H on the upstream slope. Both slopes have undesirable vegetation. The emergency spillway has major problems which could lead to considerable damage including possible failure during a period of high flow in the spillway, also the spillway is inadequate to pass the 1/2 PMF (design flood) without overtopping the dam. Other problems include probable seep areas at the north abutment as the lake level approaches or exceeds normal pool elevations and the valve location on the drawdown pipe.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1981
- Accession Number
- ADA108467
Entities
People
- William. E. Bush