National Program for Inspection of Non-Federal Dams. Crystal Lake Dam (CT 00104), Connecticut River Basin, Winchester, Connecticut. Phase I Inspection Report PDF Download
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Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 76
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Book Description
The dam is an earthfill embankment with a concrete and masonry spillway at the central part of the dam. A new highway embankment for Route 263 was constructed in 1976 just downstream from the dam. The old road is now used as an access to the dam lies just below the crest and extends along the dam from the right abutment to the spillway. The dam is approximately 520 feet long an 8 feet wide at the crest, which is 14 feet above the streambed of Sucker Brook. The spillway consists of a 45 foot long broad-crested concrete weir and a concrete apron which is just below the weir and enclosed by masonry training walls. This apron funnels the water into a 60 inch asphalt coated corrugated metal pipe through the new highway embankment. Based upon the visual inspection at the site and past performance, the dam is judged to be in fair condition. No evidence of structural instability was observed, however there are areas requiring attention such as seepage on the right toe of the dam, spalling of the spillway weir and wet areas and lime deposits on the masonry training walls. Peak inflow to the reservoir is 1250 cfs; peak outflow is 550 cfs with the dam overtopped 0.1 feet. The spillway capacity is 410 cfs., which is equivalent to 75% of the routed test flood outflow. The hydraulic/hydrologic calculations do include the effects of the Route 263 highway embankment and 60 inch culvert.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 76
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Book Description
The dam is an earthfill embankment with a concrete and masonry spillway at the central part of the dam. A new highway embankment for Route 263 was constructed in 1976 just downstream from the dam. The old road is now used as an access to the dam lies just below the crest and extends along the dam from the right abutment to the spillway. The dam is approximately 520 feet long an 8 feet wide at the crest, which is 14 feet above the streambed of Sucker Brook. The spillway consists of a 45 foot long broad-crested concrete weir and a concrete apron which is just below the weir and enclosed by masonry training walls. This apron funnels the water into a 60 inch asphalt coated corrugated metal pipe through the new highway embankment. Based upon the visual inspection at the site and past performance, the dam is judged to be in fair condition. No evidence of structural instability was observed, however there are areas requiring attention such as seepage on the right toe of the dam, spalling of the spillway weir and wet areas and lime deposits on the masonry training walls. Peak inflow to the reservoir is 1250 cfs; peak outflow is 550 cfs with the dam overtopped 0.1 feet. The spillway capacity is 410 cfs., which is equivalent to 75% of the routed test flood outflow. The hydraulic/hydrologic calculations do include the effects of the Route 263 highway embankment and 60 inch culvert.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 134
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Crystal lake is an earthen embankment dam with a maximum height of 50 feet and a length of 130 feet. The upstream and downstream slopes are faced with riprap. The dam has a water control structure with a 36-inch diameter outlet pipe controlled by two sluice gates and a stop log spillway. The dam impounds Crystal lake which is used for recreational purposes. The lake has a storage volume of 350 acre-feet. Based upon the height of the dam, the size classification is intermediate. The dam is judged to be in generally fair condition. The crest is level, and no lateral movement was observed. The vertical and horizontal alignment of the dam is good. Some minor erosion along the dam adjacent to the left abutment was noted. The riprap paving on the upstream face is in good condition. The rockfill downstream face is also in good condition. Small trees and scrub brush are growing on the upstream and downstream slopes and could cause problems if not removed. The total capacity of the water control structure and the 36-inch diameter outlet pipe is adequate to pass the spillway test flood with a freeboard of 0.8 feet.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 75
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The dam is a 170 ft. long, 22 ft. high dam consisting of stone, earth, and concrete. The inspection did not disclose any findings that indicate an immediate unsafe condition. The general condition of the dam is good. The dam's spillway will not pass the required test flood. Many overhanging trees and two debris dams were noted in the downstream channel. (Author).
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 105
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The dam is approximately 450 feet long on the paved roadway running along the axis of the dam which serves as a town street and is approximately 40 feet wide. With a maximum height of approximately 14 feet, the dam is composed of a downstream dry-laid stone masonry wall with an upstream earth fill. The upstream slopes are inclined gently into the lake and are protected by dumped riprap. The two spillways are actually lowered portions of the roadway. The spillways, each 75 feet long, discharge over the downstream masonry wall and onto a dumped riprap splash apron. The low level outlet is a culvert through the dam from 2 low level sluice gates located at the upstream face of the dam. From this outlet, water is routed either to a small generator in the Union Pin Company factory immediately downstream of the dam, or to a discharge channel alongside the factory and back into the stream. Based on the visual inspection at the site and past performance, the dam is judged to be in fair condition overall. No evidence of instability was observed in the dam or its appurtenances, and the condition of the earth dikes was good. Based upon the size (Intermediate) and hazard classification (High) of the dam in accordance with Corps of Engineers Guidelines, the test flood will be equivalent to the Probable Maximum Flood (PMF). Peak inflow to the lake is 9,500 cubic feet per second (cfs); peak outflow is 6,000 cfs with a freeboard of 1.0 feet to the top of the project. Based on our hydraulics calculations, the spillway capacity is 8,600 cfs, which is equivalent to 143% of the routed test flood outflow.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 84
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Book Description
Crystal Lake Dam is an earthen embankment structure with a maximum height of 36 feet and a length of 230 feet. The centrally located stone masonry spillway is 50 feet wide. The broad crested weir has a series of stone steps which compromise the downstream face. The outlet works consist of an 18 inch diameter conduit which passes through the dam to the left of the spillway structure. Crystal Lake is used for passive recreation. The lake has a maximum storage volume of 63 acre-feet and the size classification is thus small. A breath of the dam could effect several homes and commercial establishments, along with Connecticut Route 4 and 272 which are in the probable impact area. With the possibility of some loss of life and the probability of excessive economic losses, the dam has been classified as having a high hazard potential. The dam is judged to be in generally fair condition. The crest of the dam has a slight undulation and is subjected to vehicular traffic. Some erosion of the downstream slope has occurred. No embankment or downstream seepage was noted. Large trees are growing along the downstream slope of the dam. The stone masonry spillway is in good condition. The capacity of the spillway is inadequate to pass the one-half PMF test flow outflow (3790 CFS) without overtopping the dam. The test flood would overtop the dam by about 1.6 feet. The spillway can pass about 51 percent of the test flood outflow without overtopping the dam.
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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 : 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.
Publisher:
ISBN:
Category :
Languages : en
Pages : 88
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Based on the visual inspection, available records and past performance, the dam is considered to be in fair condition. Based on size and hazard classifications in accordance with Corps guidelines, the test flood is the PMF. In addition to long term recommendations, there are several remedial measures which should be implemented immediately.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 84
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Winchester Lake Dam is a 675-foot long earth embankment dam with a maximum height of 23 feet. The top width of the dam is 14 feet. The upstream embankment slope is 2.5:1 and is protected with riprap below the water surface. The downstream slope is 2:1. The spillway is 25 feet wide, located at the right side of the dam. A 24-inch diameter cast iron pipe under the center of the dam provides a low level outlet. The lake is open to the public and used for recreational purposes. Winchester Lake has a storage volume of 3,120 acre-feet; the size classification is thus intermediate. The dam and its appurtenances were judged to be in generally fair condition. The dam embankment is overgrown with extensive vegetation on both the upstream and downstream faces. Many large trees are in the vicinity of the toe of the slope. General erosion and sloughing of the slopes were noted. A 3-inch pipe was discharging a significant quantity of clear water at the toe of the slope adjacent to the blow-off location. The slope in this vicinity was wet and spongy. The upstream face has riprap in good condition; however, the upper 7 feet of the slope is not protected. Erosion has occurred on both sides of the spillway structure. The capacity of the spillway is adequate to pass the 1/2 PMF spillway test flood outflow with a freeboard of 0.7 feet.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 86
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The 140 foot long dam is an earth embankment, the top of which, at elevation 154.5, is approximately 15 feet above the streambed of Belcher Brook. A drop inlet at a flow line elevation about 4.5 feet below the top of the dam, is the spillway facility. A wooden gate extending the full 7.5 foot depth of the structure is the low level outlet, however it is apparently stuck in a closed position. The inlet structure feeds an arched brick culvert which has an estimated chord length of 7 feet and an effective depth of approximately 3 feet, due to heavy siltation. A recent partial collapse of the brick culvert where it abuts the downstream low-level outlet headwall caused partial blockage of the culvert as well as an approximately six foot wide cavity and sloughing to the crest of the dam on the downstream slope. Based on the visual inspection at the site and past performance, the dam is judged to be in very poor condition. Evidence of instability was noted in the form of a collapse of the outlet conduit and a subsequent failure of the downstream slope of the dam. There are other areas requiring attention as well. Based upon the hydraulics computations, the spillway capacity is 180 cfs to the top of the dam, which is equivalent to 72% of the routed test flood outflow.
