National Program for Inspection of Non-Federal Dams. Pattaconk Reservoir Dam (CT 00398), Connecticut River Basin, Chester, Connecticut. Phase I inspection Report
Abstract
The 23 foot high dam on Pattaconk Brook is an earth embankment approximately 416 feet in length, 100 feet of which is a continuous earth dike confining an area of a borrow excavation which is flooded regularly. The top of the dam is irregular with a typical width of 17 feet. The upstream slope is at a 2.5 horizontal to 1 vertical inclination while the downstream slope is inclined to 1.75 horizontal to 1 vertical. The upstream slope is protected with riprap while the downstream slope is covered with a fairly heavy growth of brush and small saplings. The 28 foot long spillway crest is of concrete and may be described as a broad crested concrete weir. Immediately downstream of the crest, the spillway is lined with large stones. The outlet gate is located in the concrete gate structure in the pond 25 feet offshore of the dam, and is presently inoperable. The condition of the structure and that of the low level conduit is unknown. At the downstream toe of the dam, the low level outlet is a stone masonry culvert 1.5 feet high by 2.0 feet wide. Based on the visual inspections and past performance, the dam appears to be in poor condition. No evidence of immediate instability of the earth dam was observed, however there are some areas requiring attention. Based upon our hydraulics computations, the spillway capacity is 530 cfs which is equivalent to 34% of the routed test flood outflow.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1979
- Accession Number
- ADA144742
Entities
Organizations
- New England District, U.S. Army Corps of Engineers