National Program For Inspection Of Non Federal Dams Simonds Pond Dam Ma 00874 Merrimack River Basin Leominster Massachusetts Phase I Inspection Report
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| Author | : CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV. |
| Publisher | : |
| Total Pages | : 87 |
| Release | : 1981 |
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Simonds Pond is approximately 365 feet long and has a hydraulic height of 26 feet. The storage capacity is 86.5 acre-feet. The dam has a concrete cap and stone abutments. The emergency spillway is 48 feet long and occupies the center portion of the dam. As a result of the visual inspection and a review of available data, Simonds Pond Dam is considered to be in poor condition. Major concerns are: significant seepage at the toe of the dam; missing mortar and poor condition of the joints of the spillway; extensive spalling and cracking of the concrete cap on the top of the dam and spillway; deterioration of the spillway apron; extensive spalling of the concrete gatehouse foundation; and inadequate spillway capacity. The test flood inflow was estimated to be 2,500 cfs and resulted in an outflow discharge estimated to be 2,460 cfs, which would overtop the dam by approximately 1.3 feet. The maximum spillway capacity with the water level at the dam crest was estimated to be 700 cfs, which is approximately 28 percent of the test flood discharge.
| Author | : CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV. |
| Publisher | : |
| Total Pages | : 81 |
| Release | : 1980 |
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The dam is a 470 ft. long earthfill dam with a maximum height of 14 ft. There are deficiencies which must be corrected to assure the continued performance of the dam. Generally the dam is in poor condition. It is small in size with a hazard potential of high. (Author).
| Author | : CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV. |
| Publisher | : |
| Total Pages | : 73 |
| Release | : 1979 |
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Rockwell Pond Dam is a 460-foot lon>, 20-foot high earthfill dam built in the 1800's. The 75.7-foot long, modified sharp-crested spillway has a crest at El 416.4. A concrete bridge spans the spillway channel. The main outlet is a 12-inch diameter pipe controlled by a valve which is submerged in a manhole. The following deficiencies were observed at the site: mssing riprap and localized growth of brush and small trees on the upstream face of the right embankment; localized erosion of upstream and downstream earth slopes; voids exposing soil behind the spillway weir wall; cracked or missing mortar from joints in the spillway training walls; spalled concrete and exposed reinforcing steel on the bridge pier; efflorescence and spalling on the underside of the bridge deck; a submerged inoperable valve on the main outlet; and an inoperable slide gate on the intake of the auxiliary outlet. The test flood would overtop the dam by about 1.6 feet. The spillway can discharge 60 percent of the test flood before the dam is overtopped.
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| Total Pages | : 1224 |
| Release | : 1985 |
| Genre | : Science |
| ISBN | : |
| Author | : CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV. |
| Publisher | : |
| Total Pages | : 80 |
| Release | : 1979 |
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The impounding structures at Fall Brook Reservoir include a 1392-foot long, 37-foot high main dam with a spillway and outlet, and a 256-foot long, 11-foot high dike. The spillway is located at the south abutment of the dam, and consists of a broad-crested weir 19 feet long with vertical stone masonry training walls that extend the length of the discharge channel. The outlet for the dam consists of a 30-inch diameter cast-iron pipe which discharges at the toe of th dam. The dam is generally in fair condition. The test flood outflow of 2,370 cfs and pool at El 657.6 will overtop the dam by 0.6 feet and the dike by 1.4 feet. The spillway capacity at El 646.2 (the low point on the crest of the dike) is 500 cfs, which is 21 percent of the test flood outflow.
| Author | : CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV. |
| Publisher | : |
| Total Pages | : 101 |
| Release | : 1979 |
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The dam consists of an earth dike, about 250 ft. long on the left bank of the river, and a z-shaped stone masonry spillway about 212 ft. long. The dam itself is generally in good condition. There was no evidence of settlement, lateral movement or other signs of structural failure. It is small in size with a high hazard potential.
| Author | : CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV. |
| Publisher | : |
| Total Pages | : 68 |
| Release | : 1979 |
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Bailey Pond Dam, Amesbury, Mass., is a 180 foot long earth embankment with concrete walls forming a portion of the upstream face of the dam and the approach channel to the spillway. The height of the dam is 15 ft. which is the height of the inlet chamber below the spillway. The dam and spillway are generally in fair condition. A test flood equal to 1/4 the PMF was selected.
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| Total Pages | : 1022 |
| Release | : 1985 |
| Genre | : Government reports announcements & index |
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| Author | : CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV. |
| Publisher | : |
| Total Pages | : 122 |
| Release | : 1980 |
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| ISBN | : |
Lake Wampanoag Dam is approximately 660 feet long including the spillway and has a maximum height of approximately 22 feet. It consists of an earth embankment with riprap at the upstream face and a loamed and seeded crest and downstream face. Based on the size classification (intermediate) and hazard potential classification (high), the spillway test flood is the PMF.
| Author | : CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV. |
| Publisher | : |
| Total Pages | : 77 |
| Release | : 1979 |
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Chaffin Pond Dam is actually a section of roadway embankment approximately 135 ft. long, 11 ft. high and with a minimum width of 100 ft. Three submerged culvert outlets pass through the dam between upstream and downstream headwalls, allowing the water level to be the same on both sides of the dam. The control entrance to the assumed 30-in. diameter outlet on the left side has slots for stoplogs; however, none are in place. The control for a 4-ft. box culvert in the center is an open wood gate. The third outlet culvert is also gated but apparently blocked. Water from Chaffin Pond flows to outlet works at a second pond downstream from the dam where water is drawn for hydraulic research purposes. The dam is in poor condition, based on a visual examination of the structure. The headwalls have experienced major structural failures and the potential for a collapse of the upstream headwall with possible obstruction of flow to the outlet does exist. Hydraulic analyses indicate that the test flood would surcharge the pond by 680 acre-ft. and raise the pond level to about 4.2 ft. below the top of the dam. Therefore, no overtopping would be expected.
