Taftville Reservoir No. 2 Dam is a zoned embankment about 667 ft. long with a concrete core wall, is 16 ft. wide at the crest, and has a maximum height of about 30 ft. It has a combined drop inlet spillway and outlet tower structure. The outfall from the drop inlet is a 16 in. dia. pipe and the outlet pipe is a 12 in. dia. A trapezoidal notch in the crest of the dam serves as an auxiliary spillway. Maximum storage capacity of the reservoir is 110 acre-feet and the drainage area is 69 acres. The dam appears to be in good condition. The crest and downstream slope are covered with brush growth and there is some local displacement of rock fill and riprap. The outlet tower structure has been subject to vandalism, including demolition and removal of the concrete block tower house. Previous inspection reports noted seepage at the toe of the embankment near the 16 in. dia. spillway outfall pipe, but with the reservoir empty no seepage was evident on the date of this inspection. The drop inlet and auxiliary spillways are together adequate to pass the selected test flood of 1/2 PMF without overtopping the dam.

The dam at Deep River Reservoir is a zoned earth embankment approximately 900 feet long, 62 feet high with an average crest width of 20 feet. It was originally constructed in 1926, 7 and raised in 1971, 2 to its present configuration. It is owned by the City of Norwich, Connecticut and operated by the Department of Public Utilities as the main surface water supply of the City. The dam has an agee overflow spillway at the right abutment. The spillway is a converging chute type with a drop to a stilling basin at the toe of the dam. The outlet works and control tower are centered on the embankment and discharges from the tower's wet well flow through a reinforced 42 inch diameter condiut beneath the dam. An earth embankment dike 240 feet long in an adjacent cove of the reservoir contains an erodable fuse plug emergency spillway. As a result of the visual inspection and the review of available data regarding this facility, the dam is considered to be in GOOD condition. To assure the long-term performance of this structure, several items of concern require attention: modifications need to be made to the existing relief well monitoring system in order to more accurately record the seepage flow, a localized erosion immediately upstream of the left abutment of the dam must be repaired, and vegetable growth in the downstream channel of the emergency spillway should be removed. The maximum outflow capacity of the spillway under a stillwater condition is equal to 18,860 CFS which represents more than 100 percent of the test flood.

Fairview Reservoir Dam is an earth dam with a masonry core wall constructed around 1868 and is used today as a standby water supply for the city of Norwich. The dam has a maximum height of 28.0 feet and is approximately 520.0 feet long, with a top width of 27.0 feet. There are four auxiliary dikes at the north end of the reservoir; all four dikes are earth embankments of the same construction and similar to the main dam. The outlet spillway is located in the Northwest Dike and is 27.0 feet long. The dam is considered to be in FAIR condition. Several visible signs of distress which indicate potential hazards are: seepage at two spots at the downstream toe of the dam, seepage through the roof of the valve chamber, rotting stumps on the main embankment, trees and shrubs on the downstream face of the main dam and both faces of all the dikes, structural deterioration of and seepage from under the spillway, rusted outlet conduits at the valve chamber with valves frozen in the open position allowing constant pressurized outlet pipes to pass through the embankment, and a general lack of regular maintenance. The maximum spillway discharge is 648 cfs, or abut 48 percent of the test flood outflow.

Waterbury Reservoir No. 2 Dam consists of an earth embankment with a downstream stone masonry wall. The dam has a top width of 22 feet, a maximum height of 20 feet, and an overall length of 230 feet including a 40 foot long overflow spillway located near the left end of the dam. The outlet works consist of a gate chamber at the right of the spillway, and a 12-inch cast iron pipe extending approximately 100 feet downstream of the dam. The dam impounds Waterbury Reservoir No. 2 which was formerly used as a storage reservoir for public water supply and currently serves no formal purpose. Based on the visual inspection, the dam is judged to be in poor condition. Features that could affect the future integrity of the dam are seepage at the base of the masonry wall and downstream of the dam; erosion of the upstream slope and crest; and the inaccessibility of the low level outlet or blowoff gates. The spillway capacity with the water level at the top of the dam is 410 cfs and is equal to 156 percent of the test flood routed outflow.

The dam, constructed in 1964 and 1965 to replace an earlier dam which failed in 1963 is an earth embankment approximately 435 feet in length with an emergency spillway at its right end. It is approximately 30.5 feet in height and has a maximum design storage of approximately 235 acre-feet. The principal spillway is a drop inlet structure. The dike, built the same time as the dam is approximately 740 feet in length and 18.5 feet in height. The upstream slope is protected by riprap to approximately 3 feet above the normal pool and grassed to the top of the slope. There is a paved roadway along the top of the dike embankment and the downstream slope is grassed and contains a toe drain. Based upon the visual inspection and past performance, the project, is judged to be in good condition. No evidence of instability of either the dam or dike was observed. Peak inflow to the pond at PMF is 780 cubic feet per second (cfs); peak outflow is 490 cfs with the dam and dike maintaining 3.0 feet of freeboard. The combined spillway capacity to the top of the project is 1142 cfs, which is equivalent to 230% of the routed test flood outflow.

The Greenville Dam is a long stone-filled timber crib spillway structure with two earth embankments with vertical stone masonry facing forming the spillway abutments. The total length of the dam is 664 feet including the 400 feet timber crib spillway. The outlet works for the dam is a series of 6-10 ft. W x 10 ft. H gates leading to a downstream canal used for generating power at a downstream facility. This dam has a maximum height of 29.0 feet and was originally build in the year 1982. The dam was judged to be in FAIR condition. However, because the river stage at the time of the visual inspection was high, the assessment of the dam is based only on those visible portions that could be readily inspected. Those components were the abutment embankments and the outlet structure. The spillway could not be evaluated. Several items require attention to insure the long term performance of the dam. They include: seepage at the left embankment, erosion at the toe of the left embankment, brush growth of the upstream face of the right embankment. Construction work at the left embankment has resulted in the temporary creation of a low area in that embankment crest. The routed Test Flood outflow for this dam is equal to the Probable Maximum Flood (PMF) or approximately 140,000 CFS and would overtop the dam by 6.2 feet. The maximum spillway discharge of 84,480 CFS represents 60 percent of the test flood outflow.