National Program for Inspection of Non-Federal Dams. Sterling Pond Dam (CT 00610), Thames River Basin, Sterling, 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 : 87
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Book Description
The Sterling Pond Dam, built on 1870 to impound water for industrial use, is a masonry structure with earth fill along the upstream slope. The dam is approximately 1010 feet in length, 12.5 feet in height and impounds approximately 125 acre-feet of water on the Mossup River. There are three stone masonry spillways; one at each end and one at the central portion of the dam. The spillway at the left end is 65 feet long, the central spillway is 70 feet along and the right spillway is 52 feet long. Based upon the visual inspection at the site and past performance of the dam, the project is judged to be in fair condition. There are items requiring repair, maintenance and monitoring such as deterioration of the masonry at the spillways, erosion at the top and upstream slope of the earth fill embankment, lack of riprap protection on the upstream slope and minor seepage. The total capacity of all three spillways with the lake level to the top of the dam is 2940 cfs, which is 10% of routed test flood outflow.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 87
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Book Description
The Sterling Pond Dam, built on 1870 to impound water for industrial use, is a masonry structure with earth fill along the upstream slope. The dam is approximately 1010 feet in length, 12.5 feet in height and impounds approximately 125 acre-feet of water on the Mossup River. There are three stone masonry spillways; one at each end and one at the central portion of the dam. The spillway at the left end is 65 feet long, the central spillway is 70 feet along and the right spillway is 52 feet long. Based upon the visual inspection at the site and past performance of the dam, the project is judged to be in fair condition. There are items requiring repair, maintenance and monitoring such as deterioration of the masonry at the spillways, erosion at the top and upstream slope of the earth fill embankment, lack of riprap protection on the upstream slope and minor seepage. The total capacity of all three spillways with the lake level to the top of the dam is 2940 cfs, which is 10% of routed test flood outflow.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 103
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The Packers Pond Dam, built about 1880 to provide water for industrial use, is an earth embankment impounding 450 acre-feet of water on Mill Brook. The length of the dam, including the spillway, is 325 feet. The top of the dam averages between 12-15 feet in width and is approximately 18 feet above the old streambed at the spillway discharge channel. The spillway, located at the right end of the dam, is a 64 foot long, broad-crested, stone masonry structure which provides 4.4 feet of freeboard from the crest to the top of the dam. The outlet is a concrete intake and gate structure located on the upstream slope at the left end of the dam. The gate is not functional and the size of the outlet could not be exactly determined. However, the outlet is assumed to be approximately 3 feet wide by 2.5 high. A railroad embankment runs along the downstream toe of the dam. This embankment is about 24 feet in height, with the top of the embankment approximately 12 feet higher than the top of the dam. The spillway capacity with the pond level at the top of the dam is 1700 cfs, which is 28% of the routed test flood outflow.
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Category : Government reports announcements & index
Languages : en
Pages : 1152
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Author:
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ISBN:
Category : Science
Languages : en
Pages : 1194
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Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
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Category :
Languages : en
Pages : 97
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Fitchville Pond Dam is a stone masonry and concrete gravity dam constructed about 1871 and is used solely for recreation. The dam has a height of 27 feet and is approximately 200 feet in length. The spillway is an uncontrolled ogee overflow structure which comprises the right two thirds of the dam. The outlet works for the dam consists of three manually operated sluice gates which discharge flows into a waste way at the left abutment of the dam. Due to its age, Fitchville Pond Dam was neither designed nor constructed by present state-of-the-art procedures. Based upon the visual inspection at the site and the lack of engineering, operational and maintenance data, there are areas of concern which must be corrected to assure the long-term performance of this dam. The dam is considered to be in FAIR condition. The dam is classified as SMALL in size and a SIGNIFICANT hazard structure in accordance with the recommended guidelines established by the Corps of Engineers.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
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Category :
Languages : en
Pages : 110
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The dam consists of a concrete principal spillway, embankments to the right and left of this spillway and an emergency spillway near the right end of the dam. The principal spillway is a concrete chute with weir-boards at the upstream end and the emergency spillway is an unlined channel cut into the right end of the embankment. A swale, which will overflow to the toe of the dam at approximately the same elevation as the auxiliary spillway, exists at the left end of the dam. There is no low-level outlet at the dam. Based upon the visual inspection at the site and past performance, the dam appears to be in fair condition with items which require repair, maintenance and monitoring. These include spalling of the concrete walls at the principal spillway, seepage through the embankments, trees and brush on the embankments and in the emergency spillway, erosion of the upstream slopes, extending the embankment to fill the swale at left end of the dam, and debris and overhanging brush in the spillway discharge channels. The total spillway capacity at the same pool level is 820 cfs, which is greater than 100% of the routed test flood outflow.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
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Category :
Languages : en
Pages : 108
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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.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
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Category :
Languages : en
Pages : 69
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The dam, built around 1920, has a total length of approximately 400 feet, consisting of a 184 foot long board-crested masonry spillway, a 190 foot long earth embankment, and a 27 foot long sluiceway. The top of the embankment, at elevation 88.7, is approximately 20 feet wide, 8.7 feet above the spillway crest, and 23 feet above the streambed of the Little River. With the pond level to the top of the dam, the pond impounds approximately 1000 acre-feet of water. The sluiceway at the left end of the dam leads to abandoned factory buildings about 400 feet from the dam. The intake to the sluiceway is a wood bulkhead, which contains 5 gates. Based upon the visual inspection at the site and past performance, the project is judged to be in poor condition. No evidence of instability of the project was observed. However, there are items which require maintenance, such as the dense vegetation on the embankment and the inoperable sluice gates. The spillway capacity with the pond level to the top of the dam is 13,000 cfs, which is equivalent to 108% of the routed test flood outflow.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
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Category :
Languages : en
Pages : 85
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North Grosvenordale Pond Dam is a composite masonry and earth dam consisting of two downstream stepped, ashlar faced masonry overflow sections, a granite block and earth fill right abutment and an earth fill right abutment and and earthfill dike on the left abutment. The entire length of the dam is about 2,400 ft. It is a run-of-the-river dam which once served the industrial needs of the downstream mill. Outflows through the millrace are now used for fire protection of the mill. North Grosvenordale Pond is about 1.5 miles long and has a surface area at spillway level of about 60 acres. The drainage area above the dam is about 99 sq. mi. and the maximum storage to the top of the dam is estimated at about 840 acre-ft. The dam is judged to be in generally fair condition. At the time of the inspections, water was flowing over the right spillway, so that it was not possible to observe the condition of the downstream ashlar face, or to determine whether there is any erosion at the toe of the spillways. The crest of the left spillway is higher than the right spillway. The difference is less than 6 in. The sluiceway through the left spillway is inoperative. Some of the left spillway stones have been dislodged and displaces. Several joints in the training walls are in need of repointing. The bridges over the spillways are in a deteriorating condition. Tree and brush growth is abundant along the left abutment dike. The spillways are not adequate to pass the 1/2 PMP test flood of 25,400 cfs without overtopping the non-overflow sections of the dam. The test flood would overtop the dike by about 2.2 ft. The spillway can pass 4,950 cfs or about 20 percent of the test flood without overtopping the dike.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 90
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Springs Pond Dam consists of a 77 foot stone masonry spillway and a 73 foot earth embankment with vertical downstream stone masonry wall. At top of dam elevation, the dam impounds 63 acre-feet. The outlet works consist of a 30x42-in stone conduit controlled by a wood slide gate. Under normal conditions, the entire flow, of Middle River discharges over the spillway. This dam has a maximum height of 14.4 feet with the top of dam 4.4 feet above the spillway crest and is classified as small in size with a hazard classification of significant. There are no available records to indicate when construction of the dam took place or the original purpose of the dam. The visual inspection indicates that the water was used for either power or process water at some time but is no longer used. Based upon the visual inspection, the dam is in fair condition with some seepage from the downstream face and some deterioration of the south abutment and approach channel for the outlet works. Some trees and brush are growing on the upstream side of the embankment. There are two outlet structures, neither of which is operable. An outlet at the north end of the dam was originally for control of water for downstream use. There no longer is any apparent need for this outlet. The southerly outlet structure is for use in drawing down the pool. The test flood results in the dam being overtopped by 3.1 feet to an elevation of 487.5 NGVD. At top of dam elevation, the spillway capacity is 2,300 cfs, which is 34 percent of the test flood flow.
