National Program for Inspection of Non-Federal Dams. Ellis Dam (CT 00478), Thames River Basin, Stafford, Connecticut. Phase I Inspection Report.
Abstract
Ellis Dam consists of a 490 foot long earth embankment and a 150 foot wide grassed emergency spillway. The outlet consists of a concrete riser with 6 foot long weirs on each side and a 24-inch reinforced concrete outlet pipe discharging to Ellis Brook at the toe of dam. Maximum height of dam is 40 feet with a maximum storage capacity of 824 acre-feet at crest elevation. Based on the visual inspection, Ellis Dam appears to be in good condition. There was some deterioration of the concrete on the top of the principal spillway riser, but repairs had been made. Also, there was some settlement in what appears to be a spoil area used during construction. The plans show a slide gate at the inlet to the principal spillway buy only some of the fittings are in place. Maintenance practices at Ellis Dam appear to be good. Soil Conservation Service design for this dam used a rainfall of 15 inches and a runoff of 13.5 inches for the emergency spillway design. The design flood results in a peak inflow of 4985 cfs and a peak outflow of 2396 cfs with a maximum water surface elevation 2.0 feet below the crest of dam, which was used as the test flood.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1980
- Accession Number
- ADA144569
Entities
Organizations
- New England District, U.S. Army Corps of Engineers