National Program For Inspection Of Non Federal Dams Goose Cove Reservoir Dams Dikes North Dam Ma 01098 Northwest Dike Ma 01099 South Dam Ma 00163 And Southwest Dike Ma 01100 Annisquam River Basin Gloucester Massachusetts Phase I Inspection Report

The North Dam is a 318 ft. long earth dam with a maximum height of 34.7 ft. Generally, the dam is in fair condition. There are deficiencies which must be corrected. The South Dam is a 551 ft. long earth dam. The dam is also in fair condition. Both dikes are in fair condition. They also have deficiencies which must be corrected. (Author).

The main dam is a 950 foot long, 28 foot hydraulic height earth fill embankment structure with a 25 foot long concrete spliiway at the right abutment. There are also two earthfill enbankment dikes. The west dike is about 200 ft. lonmg and has a height of 6 ft. The east dike is 100 ft. long and about 13.5 ft. in height. The dam is judged to be in generally good condition and the dikes are in fair condition. The size classification is intermediate and the hazard potential is high.

Overlook Reservoir Dam is a 370 foot long, 47 foot high, earth embankment structure with a masonry core wall and a stone masonry gatehouse. There is a separate 900 foot long, 25 foot high dike with an 10 foot long concrete channel spillway, located along the northern part of the reservoir. The visual inspection indicated the dam and dike to be in generally fair condition. Heavy vegetation, animal burrows, surficial sloughing and erosion were observed on the side slopes of the dam. Excessive tree growth and seepage was observed at the dike. Leakage into the valve chamber located upstream of the chlorination building was observed and the functionability of the control valves at the facility are questionable. The test flood outflow requires only 5 percent of the spillways capacity. Therefore, neither the dam or dike would be overtopped by the test flood.

The main dam is comprised of a 1,100 foot long, 25 foot high main embankment, and a 1,200 foot, 10 foot high east dike. There are also 3 separate earth dikes designated dikes 2, 3 and 4. Dike 2 has a length of 310 feet. Dike 3 has a length of 700 feet and Dike 4 has a length of 700 feet. The test flood inflow from the 0.10 s.m. drainage area is 300 cfs. The storage capacity of the reservoir is enough to retain the entire test inflow. The dam and dikes are in generally good condition. However, due to excessive growth of brush and trees on the slopes and the lack of seismic stability investigation, the dam and dikes are rated fair.

Goose Pond Dam is about 285 ft. long and 27 ft. high. The facility is considered in fair condition. Based on the intermediate size and high hazard potential, the flood test is the Probable Maximum Flood. Investigations are recommended to determine the stability of the embankment and the effect of seepage.

The dike, an earth embankment, was found to be in good condition. The dike is intermediate in size and its hazard potential is high. Because of this, the test flood for the dam is the Probable Maximum Flood.

Manchester Pond Dam, constructed in 1963, is a compacted zoned earthfill embankment about 1,510 ft. long with and impervious core. There are also four dikes or embankments on the reservoir rim. These dikes vary in length from 140 ft. to 915 ft., in height from 7 ft. to 16 ft., and all have a 15 ft. wide crest. A 15 ft. long ogee spillway crest is located on the right abutment of the dam. An outlet control structure is located about 200 ft. left of the right abutment. The reservoir can be drawn down by means of an 18 in. dia. pipe or a 48 in. dia. pipe. The routed test flood outflow (95 cfs) would not overtop the dam. The spillway can pass the routed test flood outflow with about 2.2 ft. of surcharge to top of dam. The dam is judged to be in generally fair condition. There is minor seepage at the downstream toe. Brush and tree growth have taken a firm stand on the downstream slope, where several animal burrows were noted, and minor erosion along one area of the downstream slope was also evident. All four dikes or embankments are judged to be in good condition. There was no evidence of seepage along the dikes. Brush and tree growth have taken a firm stand on the crest and downstream slope of the dikes. The outlet facilities are all in good working condition. There is no adequate means of low level withdrawal.