National Program for Inspection of Non-Federal Dams. Mill Pond Dam (CT 00164), Connecticut River Basin, Newington, 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 : 56
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Book Description
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.
Publisher:
ISBN:
Category :
Languages : en
Pages : 56
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Book Description
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.
Publisher:
ISBN:
Category :
Languages : en
Pages : 31
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Book Description
Upper Mill Pond Dam is a stone masonry dam approximately 100 feet long and 15 feet high. The spillway is 92 feet long, 9 feet wide and consists of a masonry broad crested weir. The water level is at the spillway crest and can be lowered by opening the low-level discharge gate which was recently made operable by the Middletown Water Department. In general, the overall condition of the dam is FAIR. The structural stability of the dam is good as evidenced by its vertical, horizontal and lateral alignment. The stone masonry is in good condition although moss and weeds are growing from the joints. The spillway weir and east abutment are in good condition. The west abutment is badly spalled at its base. The discharge gate inlet structure is badly spalled and the bar rack is cluttered with debris. There is some seepage at the east end of the dam where the stone masonry meets the abutment/ledge interface. Vegetation is growing around this area as well. The ledge continues along the downstream channel bank and there is minor seepage. A drainage pipe outlets above the west abutment. There is presently a scour hole at this location. This scour hole has caused the last section of the drainage pipe to collapse into the hole and is undermining the west spillway abutment. At the spillway elevation, the water surface area and storage capacity is 5 acres and 31 acre-feet respectively. The spillway capacity when the water level in the pond is at the top of the dam is 250 cfs. The test flood will overtop the dam by 1.8 feet.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
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Category :
Languages : en
Pages : 79
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Book Description
Paper Mill Pond consists of a 17 foot long concrete spillway and a 15 foot long concrete dam, all completely surrounded by buildings of Amerbelle Corporation. At top of a dam elevation, the dam impounds 90 acre-feet. Outlet works consist of a drawdown conduit of unknown size and twin 8-inch line for process water. Under normal conditions, the entire flow of the Hockanum River discharges over the spillway. This dam has a maximum height of 16.7 feet with the top of dam 5.5 feet above the spillway crest. The dam is in fair condition with some seepage from the face of dam and some deteriorated concrete. In addition to the operable outlet works, there is the 48-inch metal penstock that was originally used to supply water to the generator turbine. This outlet is plugged and the pipe partially filled and collapsed.
Author:
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Category : Research
Languages : en
Pages : 1138
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Book Description
Sections 1-2. Keyword Index.--Section 3. Personal author index.--Section 4. Corporate author index.-- Section 5. Contract/grant number index, NTIS order/report number index 1-E.--Section 6. NTIS order/report number index F-Z.
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.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 64
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Aldon Mill Pond Dam is a stone masonry and earth embankment structure approximately 95 feet long and 25.5 feet high. The dam is judged to be in fair condition with several areas that require attention. The dam is classified as small and has a significant hazard potential. The test flood for this dam is the 100-year flood and is calculated to be 2,500 cfs. (Author).
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 42
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The Upper Millpond Dam is located on the Indian River in Clinton, Connecticut. The dam was constructed in 1813. The overall dam length is 82.5 feet including a stone masonry spillway of 24.5 feet located near the left side. There is a concrete cap, approximate 8 inches high by 1 foot wide which was added to the dam on either side of the spillway in 1975. On the right side of the dam is the remains of an outlet box which is partially collapsed. Also, located beneath the spillway is a plugged 10-inch metal outlet pipe. The maximum height of the dam is 8.2 feet and the average depth immediately behind it is 1 foot. The dam is owned and operated by the Town of Clinton. The dam impounds Upper Millpond which is 16.5 acres in size and which is essentially a widened channel of the Indian River. The dam is in fair condition with some cracking and spalling of the concrete cap, no functioning outlet works, several large overhanging trees just upstream of the dam, measurable seepage a round the left abutment and some misalignment of the stone masonry dam itself.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 69
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Rogers Pond Dam is a 231 foot long earth and vertical stone masonry dam with a maximum height of 9 feet. There is a 50 foot long concrete spillway near the center of the dam. The width of the dam varies from a minimum of 6 feet at the right spillway edge to 21 feet at the left abutment. The purpose of this dam is primarily recreational. The visual inspection of Rogers Pond Dam indicated that the dam is in fair condition. The inspection revealed that portions of the upstream masonry wall have been displaced at several locations. Numerous trees are growing on the left upstream embankment. Seepage was noted along the stone wall on both sides of the spillway and the ground was wet and soggy 25 feet downstream of the left side of the dam, and a large depression was observed just downstream of the wall along the right side of the dam. The storage at top of dam is 60 acre-feet. The spillway will discharge 500 cfs or 42% of the test flood with the pool level at the top of the dam. The peak test flood inflow is 1195 cfs, with a peak test flood outflow of 1140 cfs, which will overtop the dam by 0.6 feet.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 34
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Book Description
Moulsons Pond Dam is a stone masonry dam approximately 80 feet long and 23 feet high. The spillway is L shaped with a concrete cap that extends almost the total length of the dam. A bridge spans over the river immediately downstream of the spillway. The top of road is the dam crest and the west bridge abutment is the west spillway abutment. There is a 2-foot high concrete abutment at the east end that is 8 feet below the top of the dam. At the west end of the dam there is a 6-foot diameter pipe that passes beneath the roadway into a sluiceway that goes to an old mill. There is no control for this sluiceway which is always open and the water discharges into the downstream channel. There is no low-level discharge pipe.
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.
