The Seymour Reservoir No. 2 Dam consists of an earth embankment with a masonry core wall. The dam is approximately 900 feet long with a top width of 10 feet and a maximum height of 31 feet. A 25.75 foot long concrete overflow spillway is located near the right end of the dam. The outlet works consist of a 12-inch cast iron low level outlet or blowoff pipe through the embankment, controlled by a downstream gate valve. In addition to the main dam, a low dike is located on the right side of the reservoir. The earth dike is approximately 800 feet long with an average height of 6 feet and a top width of 15 feet. Based on the visual inspection and a review of all available pertinent data, the condition of the dam is judged to be fair. The future integrity of the dam can be affected by deterioration of the floor of the spillway channel; seepage exiting downstream of the dam; the absence of an upstream gate on the low level outlet or blowoff line; and inadequate spillway capacity. The spillway has a capacity of 500 cfs without any flashboards and 100 cfs with flashboards before overtopping the low point of the dam crest. With flashboards, the spillway can pass 18 percent of the routed Test Flood outflow. Without any flashboards the spillway can pass 91 percent of the routed Test Flood outflow and the outflow would overtop the low point of the dam crest by 0.2 feet.

The Seymour Reservoir No. 3 Dam consists of an earth embankment with a masonry core wall. The embankment has a top width of 14 feet and a maximum height of 42 feet. The overall length of the dam is 730 feet, including 23.5 foot long concrete overflow spillway. The outlet works consist of a 12-inch cast iron low level outlet or blowoff pipe through the earth embankment and core wall. The dam impounds the Seymour No. 3 Reservoir, a storage reservoir for public water supply for the Valley Division of the Bridgeport Hydraulic Company. Based on the visual inspection and a review of all available pertinent data, the dam is considered to be in fair condition. Features that could affect the structural integrity of the dam are undermining and seepage associated with the left wall of the spillway discharge channel; uncontrolled seepage that bypasses the underdrain; and the absence of an upstream gate on the low level outlet or blowoff line. The spillway can discharge 132 percent of the routed Test Flood outflow with flashboards and 151 percent without flashboards. The Test Flood would not overtop the dam.

Seymour Reservoir No. 4, a storage reservoir for public water supply is impounded by a main dam and two dikes. The main dam consists of an earth embankment approximately 425 feet long, with a top width of 20 feet, and a maximum height of 28 feet. The right dike begins approximately 100 feet to the right of the main dam, and consists of an earth embankment approximately 400 feet long, with a top width of 15 feet, and a maximum height of 22 feet. The left dike is located approximately 1,000 feet upstream of the main dam on the left bank of the reservoir, and consists of an earth embankment approximately 160 feet long, with a top width of 15 feet and a maximum height of 12 feet. The low level outlets or blowoffs consist of 10 and 8-inch cast iron pipes through the main dam embankment. The spillways consist of an 18-inch concrete overflow pipe through the right dike embankment, two 24-inch concrete overflow pipes through the main dam embankment, and an auxiliary earth spillway located at the left abutment of the left dike. Based on the visual inspection and a review of all available pertinent data, the dam is judged to be in poor condition. Some features that could affect the integrity of the dam and dikes include the seepage and possible internal erosion at the toe of the main embankment, possible internal leakage from the blowoff and spillway pipes, and the lack of filter layers between the riprap and embankment materials. The spillway is capable of passing 102 percent of the routed Test Flood outflow without overtopping the dam.

The Seymour Reservoir No. 1 Dam consists of an earth embankment with a stone masonry core wall. The dam has an overall length of 340 feet including spillway; a top width of 10 feet; and a maximum height of 26 feet. The overflow spillway consists of a 23-foot concrete weir with stone masonry training walls. The outlet works consist of two 12-inch cast iron pipes through the earth embankment and core wall of the dam, controlled by manually operated gates in an upstream gage house. Based on the visual inspection and review of all pertinent data, the condition of the dam is judged to be fair. Features that can affect the integrity of the dam are the deterioration of the spillway weir, the seepage exiting at the toe and downstream of the dam, and inadequate spillway capacity. Due to the small size of the impoundment, the Test Flood outflow was assumed to equal the Test Flood inflow of 625 cfs and would overtop the low point of the dam crest by 0.9 feet. The spillway capacity with the water level at the low point of the dam crest is equal to 105 cfs or 17 percent of the Test Flood.

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.