National Program for Inspection of Non-Federal Dams. Higganum Reservoir Dam (CT 00430), Connecticut River Basin, Haddam, Connecticut. Phase I Inspection Report.
Abstract
The crest is generally grassy and the downstream slope is heavily overgrown with trees and shrubs. The upstream face is riprapped above water level and to a depth of about 3.0 feet below the normal water surface. The spillway is located in the center of the embankment and is roughly semicircular and contained between vertical masonry walls. The spillway is constructed of cut stone masonry and flows discharge onto a slab paved with stone blocks leading to a natural stream bed. This dam is considered to be in POOR condition. The visible signs of distress which indicate a potential hazard at this site are: large, wet, spongy areas generally along the entire right toe and lower slope of the dam embankment indicative of seepage; an extremely steep downstream slope; a dense large growth of trees and shrubs on the downstream slope; the small storage capacity of the reservoir relative to its drainage area; the close proximity of the populated area immediately downstream; seepage through the spillway masonry joints and a general lack of proper, regular maintenance. The maximum spillway discharge of 5710 cfs represents 48.5 percent of the test flood outflow.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1978
- Accession Number
- ADA144667
Entities
Organizations
- New England District, U.S. Army Corps of Engineers