National Program for Inspection of Non-Federal Dams. Dorothy Pond Dam (MA 00146), Blackstone River Basin, Millbury, Massachusetts. Phase I Inspection Report.
Abstract
Dorothy Pond Dam which was constructed around 1825 is an earthfill dam with an upstream mortared masonry headwall. The dam has a maximum height of 13 feet and is approximately 200 feet long. The outlet conduit is a 24-inch diameter cast-iron pipe controlled by a rack and pinion operated wooden slide gate. The spillway, which is located 180 feet west and from the dam, consists of a mortared stone paved channel that discharges into an earth channel. Generally, the dam is considered to be in fair condition. However, there are several visible signs of distress which indicate a potential hazard at this site: slight-to-moderate seepage at the downstream toe of the dam, erosion on the upstream headwall and face of the dam, large trees on the dam crest, and accumulation of debris in the spillway channel. Hydraulic analyses indicate that the existing spillway can discharge a flow of 264 cubic feet per second (cfs) at Elevation (El) 396 which is the top of the dam. An inflow test flood of 2,850 cfs (one-half of the probable maximum flood) will overtop the main dam by about 2.0 feet.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1978
- Accession Number
- ADA146344
Entities
Organizations
- New England District, U.S. Army Corps of Engineers