National Program for Inspection of Non-Federal Dams. Stockbridge Bowl Dam (MA 00022), Housatonic River Basin, Stockbridge, Massachusetts. Phase I Inspection Report

摘要

Stockbridge Bowl Dam is an earth embankment dam with a concrete and stone masonry spillway. The dam is approximately 340 feet long, with a maximum height of 19 feet. The spillway has a length of 28 feet. The spillway crest is 3 feet below the top of dam. There is a 350-foot long dike, with a maximum height of 18 feet, to the south of the main dam. The dike forms an approach channel to an outlet structure containing a sluice gate and a 5 1/2-ft. diameter outlet conduit. Based on the visual inspection, the overall condition of the project is judged to be poor. Visual observations made during the course of the inspection revealed deficiencies which require attention and should be corrected before further deterioration leads to a hazardous condition. Effects of reservoir storage would reduce the test flood inflow to an outflow of approximately 14,000 cfs which would overtop the dam by about 3.6 feet. Spillway capacity at the top of dam is 470 cfs which is less than 4% of the routed test flood outflow.