National Program for Inspection of Non-Federal Dams. Comstock Pond Dam (CT 00424), Connecticut River Basin, Essex, Connecticut. Phase I Inspection Report PDF Download
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Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
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Category :
Languages : en
Pages : 73
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Comstock Pond Dam is an earth fill dam with vertical stone masonry walls along the upstream and downstrams faces. A 25 foot long concrete spillway is located near the middle of the dam and it is bordered by masonry training walls. The downstream spillway channel consists of a 48-inch culvert under Main Street followed by a natural channel with stone walls. The dam has a total length of 540 feet, a maximum height of 8 feet, and a crest width of 16 feet. The dam has a 10 foot by 10 foot wooden platform outlet structure. This platform houses 2 drop screens, 3 gate valve shafts and a 4-inch fire drawoff pipe. The gate valves control a 15-inch outlet pipe which emerges just downstream of the spillway, and two separate pipes which supply service water to the Pratt Read Corporation. The visual inspection revealed that the dam is in fair condition. The upstream stone masonry wall and cap have deteriorated and collapsed in a number of locations. There is an area of erosion and sloughing along the upstream face beyond Station 3+90 in the direction of the left abutment. The ground is soggy at a point approximately 20 feet to the right of the right edge of the spillway. There is some seepage occurring through the downstream wall near the right edge of the spillway. The spillway with water at the top of the dam is capable of passing 186 cfs or 17 percent of the test flood outflow. The test flood will overtop the dam by 0.9 feet.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 73
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Book Description
Comstock Pond Dam is an earth fill dam with vertical stone masonry walls along the upstream and downstrams faces. A 25 foot long concrete spillway is located near the middle of the dam and it is bordered by masonry training walls. The downstream spillway channel consists of a 48-inch culvert under Main Street followed by a natural channel with stone walls. The dam has a total length of 540 feet, a maximum height of 8 feet, and a crest width of 16 feet. The dam has a 10 foot by 10 foot wooden platform outlet structure. This platform houses 2 drop screens, 3 gate valve shafts and a 4-inch fire drawoff pipe. The gate valves control a 15-inch outlet pipe which emerges just downstream of the spillway, and two separate pipes which supply service water to the Pratt Read Corporation. The visual inspection revealed that the dam is in fair condition. The upstream stone masonry wall and cap have deteriorated and collapsed in a number of locations. There is an area of erosion and sloughing along the upstream face beyond Station 3+90 in the direction of the left abutment. The ground is soggy at a point approximately 20 feet to the right of the right edge of the spillway. There is some seepage occurring through the downstream wall near the right edge of the spillway. The spillway with water at the top of the dam is capable of passing 186 cfs or 17 percent of the test flood outflow. The test flood will overtop the dam by 0.9 feet.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 72
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Mill Pond Dam is 220 feet in length, with a maximum height of 18 feet. The upstream face of dam is a vertical mortared stone masonry wall partially replaced in areas with concrete. The downstream face of the dam is a concrete wall approximately 12 feet in height and 4 feet wide. The remains of a factory foundation occupy the irregular shaped dam crest, 30 to 60 feet wide. The composition of the fill material is unknown. The spillway is 68 feet in length extending from the left abutment. Based on the visual inspection, the Mill Pond Dam appears to be in fair condition. Some settlement and cracking of the floor slab at the crest of the dam has occurred. The downstream concrete face appears to be in good condition. Downstream from the concrete portion of the dam a nearly level grassed area was observed. The grassed area indicated no visible seepage and was in generally good condition. The visible face of the spillway is in fair condition. A portion of the right spillway training wall had collapsed for a distance of approximately 18 feet. Most of the stone masonry blocks have been removed in this section and the embankment has been eroded back for a distance of approximately 8 feet. A cast iron drainage pipe is located adjacent to the end of the concrete training wall in this collapsed section. Other portions of the existing wall have been undermined causing masonry blocks to be removed. The outlet structure service gates have recently been replaced and are in good condition. The capacity of the spillway is inadequate to pass the 1/2 PMF test flood outflow of 8,070 CFS and would overtop the dam by 4.9 feet. The spillway is adequate to pass 15 percent of the test flood.
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Category : Government reports announcements & index
Languages : en
Pages : 1316
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Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 91
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This dam consists of an earth embankment, and a concrete wall which extends from the embankments to the spillway on each end of the spillway. The earth embankment is 500 feet long, 8 feet wide at the top and 6.7 feet high, with a downstream slope of 2H:1V. The concrete spillway is located at the western end of the dam and is 40 feet long with 15 inch high permanently attached timber flashboards. Based on the visual inspection, and past operational performance, the dam is judged to be in POOR condition. There are large trees growing on the embankment. The concrete wall is severely cracked and spalled and has been exposed on the downstream side by erosion. Seepage is occurring through the wall and all along the downstream toe of the embankment. The test flood for this dam is the 100 year flood. The test flood has an inflow equal to 1810 cfs and an outflow discharge equal to 1800 cfs at a stillwater elevation of 233.1 which will overtop the dam by 1.0 foot. The maximum outflow capacity of the spillway with the water level at the top of the dam is 53 cfs, which is 3 percent of the test flood outflow.
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Category : Science
Languages : en
Pages : 1028
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Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 56
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Mill Pond Dam is an earth-covered, irregular natural rock formation 600 ft. long, with a top width varying from 10 to 20 ft. and a maximum height of 19 ft. The outlet for the dam is a natural rock weir spillway approximately 35 ft. wide, which is overpassed by a footbridge. The crest of the spillway is about 3 ft. below the lowest point on the dam crest. Based on visual inspection, the Mill Pond Dam is judged to be in good condition; however, during the inspection, there was a light snow cover of approximately 2 inches which may have obscured problems, such as erosion or seepage. A test flood of a 100 year frequency was selected in accordance with the Corps of Engineers' Guidelines. The calculated test flood inflow of 1,000 cfs results in a routed outflow of 990 cfs. With the water level at the top of the dam the spillway capacity is 575 cfs which is 58% of the outflow flood. The storage capacity of the Mill Pond is 52 ac.-ft. at the top of the dam.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
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ISBN:
Category :
Languages : en
Pages : 113
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Park Pond Dam, located at the eastern end of the pond, consists of an earth embankment with a maximum height of 20 feet and a top width which varies from 8 feet to 15 feet. The dam is 420 feet long and has a 19.9 foot concrete spillway at the left end. A diversion channel from an adjacent watershed connects to the spillway approach channel. The impoundment has a maximum storage capacity of 1,100 Acre-Feet. The dike, located at the northwestern end of the pond, consists of an earth embankment with a paved roadway along the crest. The dike has a maximum height of 7 feet, a top width of 21 feet, and a length of about 80 feet. Based on the visual inspection, the dam is judged to be in poor condition and the dike in fair condition. Features which could affect the future integrity of the dam are trees and brush on the embankment; seepage through the embankment; erosion of the downstream slope; deterioration of the spillway approach channel wall and the spillway weir; the accumulation of debris in the spillway and approach and discharge channels; the location of the low level control valve downstream of the dam and lack of erosion protection on the dike. The spillway capacity with water level at the top of the dam and the dike is 310 cfs or 58 percent of the Test Flood routed outflow. The Test Flood would overtop the dam and dike by 0.3 feet.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
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ISBN:
Category :
Languages : en
Pages : 83
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Bushy Hill Pond Dam is an earth embankment structure 265 feet in length with a maximum height of 29 feet. A stone spillway 20 feet in length is located at the right abutment of the dam. The upstream face of the dam is a vertical concrete wall. The dam crest and downstream embankment are grassed. The spillway is located at the right abutment and is 20 feet in length. A 12 inch blow-off pipe provides a low level outlet. Based on the visual inspection, Bushy Hill Pond Dam and its appurtenances are judged to be in poor condition. The crest of the dam appears to dip toward the upstream face. The vertical alignment is good. The face appears to bow slightly upstream and the concrete wall is cracked at many locations. The downstream slope is uneven and erosion has occurred along the toe. Large boulders were observed at the intersection of dam and spillway training wall on the left side of the spillway. Seepage was noted along the toe of the downstream slope. The stone masonry overflow spillway section has open joints; however, no movement or seepage was observed. The spillway discharge channel is in general good condition. Some sloughing of the channel embankment (right side) was noted about 20 feet below the spillway. A 12-inch diameter low level blow-off was operated during the site visit. The test flood would overtop the dam by 1.4 feet. The spillway capacity without overtopping is 140 CFS which is about 9 percent of the test flood outflow.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
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ISBN:
Category :
Languages : en
Pages : 75
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The project, substantially reconstructed in 1967, has a total length of approximately 320 feet, consisting of an approximately 300 foot long embankment and a 20 foot long concrete spillway. The dam is approximately 23.5 feet in height above the streambed of Long Hill Brook and, with the pond level to the top of the dam, impounds approximately 250 acre-feet of water. The upstream slope is protected to the top of the dam by dumped rock riprap. The spillway is a concrete chute and is located near the right end of the dam. The low-level outlet facility is a 24 inch reinforced concrete pipe at the central portion of the embankment and is controlled from a concrete gatehouse on the dam. Based upon visual inspection and past performance, the project is judged to be in fair condition. No evidence of instability of the embankment or spillway was observed. However, there are items which require monitoring and/or maintenance, such as erosion of the spillway discharge channel and a stagnant water condition in the low-level outlet channel which does not allow a free flow of water from the toe drain pipes. Peak inflow to the reservoir at the 1/2 PMF is 850 cubic feet per second (cfs); peak outflow is 580 cfs with the lowest point along the top of the dam overtopped by 0.4 feet. The spillway capacity, with the reservoir level to the low point of the top of the dam, is 380 cfs, which is equivalent to 66% of the routed test flood outflow.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 78
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Upper Pond Dam is an earth embankment dam with a maximum height of 17 feet and a length of 390 feet. The dam embankment left of the spillway is approximately 10 feet in width, with 2 horizontal to 1 vertical upstream and downstream embankment slopes. The centrally located spillway is 72 feet in length and is a stone masonry structure. Stone masonry training walls approximately 5 feet in height are located at each side of the spillway. The outlet works consist of a concrete gate structure and an outlet channel. Based on the visual inspection, the Upper Pond Dam appears to be in poor condition. There was no movement or settlement of the crest observed. The horizontal alignment is good. The top of the outlet gate structure, however, is lower than the embankment crest. Some erosion was noted at the abutments, adjacent to the spillway section and adjacent to the outlet works. Trespassing on the slopes was not significant. Erosion scarps on the upstream slope extending 1-2 feet above waterline were noted. Several areas of broad shallow erosion on the upstream slope and upstream side of abutments were observed. Brush and many large trees (up to 2.5-ft.-dia.) with extensive root systems were noted on the slopes and crest of the dam. Standing water was observed in an area 35 feet downstream of the toe on the right side of the dam. The capacity of the spillway is inadequate to pass the 1/2 PMF test flood outflow of 5,195 CFS and would overtop the dam by about 0.9 feet. The spillway can pass about 33 percent of the test flood.
