National Program for Inspection of Non-Federal Dams. Mixville Pond Dam (CT 00302), Quinnipiac River Basin, Cheshire, Connecticut. Phase I Inspection Report

摘要

Mixville Pond Dam is an earth embankment with a vertical stone masonry downstream face that is approximately 290 feet long and 16.5 feet high. The spillway is 2 feet lower than the crest and is located near the center of the dam. At the west end of the spillway, there is a simple masonry gate inlet structure. The gate controls a 30-inch cast iron low-level discharge pipe that passes through the base of the dam. The assessment of the dam is based on a visual inspection, available information and hydraulic/hydrologic computation. The dam is judged to be in fair condition with several areas that require attention. These areas include seepage through the dam, below and adjacent to the spillway, bulging stone in the downstream masonry face and thick brush covering the crest of the dam to the east of the spillway. The spillway capacity at the top of the dam is 375 cfs or 14 percent of the test flood outflow. The test flood outflow will overtop the dam by 1.9 feet.