National Program for Inspection of Non-Federal Dams. Glenecho Lake Dam (MA 00101), Quinebaug River Basin, Charlton, Massachusetts. Phase I Inspection Report.
Abstract
Glenecho Lake Dam is a 255-foot long, 39-foot high earthfill dam built in 1957. The zoned embankment has a core of impervious fill and a cutoff trench into glacial till. The spillway is a 45-foot long, ungated ogee weir with a stilling basin at the toe. The outlet conduit is a 24-inch, cast-iron pipe located just east of the spillway. Flow through the conduit is controlled by a 2-foot square metal slide gate housed in an access well beneath the crest of the dam. The following are visible signs of distress which indicate a potential hazard at the site: cracking, tilting and settlement of the retaining wall on the upstream face of the dam; erosion at several locations on the embankment; dense growth of trees and brush on the downstream slope of the dam and in the downstream channel; lack of bedding material around riprap on the upstream slope of the dam; seepage from a hole in the downstream face of the spillway; and accumulation of rocks and other debris in the stilling basin. Hydraulic analyses indicate that the spillway at the dam can discharge a flow of 3,600 cgs with the water surface at El 771.9 which is the low point on the crest of the dam. Therefore, an outflow test flood (full probable maximum flood) of 3,150 cfs at El 771.1 will not overtop the dam.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1978
- Accession Number
- ADA145338
Entities
Organizations
- New England District, U.S. Army Corps of Engineers