[PDF] National Program For Inspection Of Non Federal Dams Crystal Lake Dam Nh 00018 Nhwrb Number 9111 Merrimack River Basin Gilmanton New Hampshire Phase I Inspection Report eBook

Author : CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
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Page : 84 pages
File Size : 28,42 MB
Release : 1978
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The dam is a 188 ft. long, 16 ft. high earth embankment dam. The condition is fair. The visual inspection did not disclose any immediate safety problems. The dam's spillway will not pass the test flood, therefore it is recommended that the owner engage a qualified engineer to evaluate further the potential for overtopping the inadequacy of the spillway. (Author).

Author : CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher :
Page : 91 pages
File Size : 14,38 MB
Release : 1980
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The dam is an earthen embankment structure with a central concrete core wall about 147 ft. in overall length and 9 ft. high from the crest of the dam to downstream toe. The dam is considered to be in fair condition. It is classified as small in size and significant in its hazard classification. (Author).

Author : CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher :
Page : 108 pages
File Size : 25,11 MB
Release : 1980
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Chase Pond Dam is a rock filled log crib with timber planking overflow structure between stone and concrete embankments. The overall length of the dam is 103 ft. The timber overflow section is approximately 12 ft. high by 50.5 ft. long and 10 ft. wide at the crest. The embankments, which are approximately 5.4 feet higher than the crest of the timber overflow section, are composed of masonry and concrete on the upstream and training wall faces. As a result of the visual inspection of this facility, the dam is considered to be in poor condition. The dam is small in size with a significant hazard classification. The dam at the outlet from Tannery Pond could be overtopped or breached. Keywords include: Inspection, Dam safety, Merrimack River Basin, Wilmot, New Hampshire, and Chase Pond.

Author : CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher :
Page : 83 pages
File Size : 46,57 MB
Release : 1979
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The dam is a stone masonry gravity dam with a total length of about 325 ft. It is small in size with a low hazard potential. The dam is in fair condition at the present time. In light of the dam's fair condition, technical inspections should be made every year. (Author).

Author : CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher :
Page : 80 pages
File Size : 39,5 MB
Release : 1978
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Mountain Pond Dam is located on the north end of Mountain Pond in Sanbornton, N.H., in mountainous terrain two miles south of the village of New Hampton. The dam is an earth embankment, 97 feet long and 14 feet high with a gated 8-inch outlet. The impoundment stores the water supply for the Town of New Hampton and is also the fire protection reserve. It is small in size with a low hazard potential. The test flood is in the range of a 50 to 100 year frequency. The condition of the dam is considered to be fair, requiring that modifications be made by the owner within 1-2 years after receipt of this inspection report. Keywords include: Inspection, Dam safety, Merrimack River Basin, Sanbornton, New Hampshire, and Tributary of Pemigewasset River.

Author : CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher :
Page : 70 pages
File Size : 43,75 MB
Release : 1978
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Todd Lake Dam is a concrete capped, gravity rock wall and earth fill structure with a maximum height above the downstream channel of 16.5 feet. The 57 foot long concrete cap serves as a spillway and includes two 12 foot long depressed sections which permit the installation of 12 inch high flashboards. The dam's size is intermediate with a significant hazard potential. The dam is in fair condition. Deficiencies in the areas of spillway capacity and possible structural stability require additional engineering investigations. Only a few relatively minor operation and maintenance improvements are necessary. Keywords include: Visual inspection, Dam safety, Merrimack River Basin, Bradford New Hampshire, and Ring Brook.

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Page : 98 pages
File Size : 47,62 MB
Release : 1978
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The dam is an earth embankment 279 ft. long and a height of 16 ft. The dam is in fair condition at the present time. Deficiencies in the areas of inadequate spillway capacity, deteriorated earth embankments and some operational aspects require near-term attention. It is intermediate in size with a significant hazard potential. The spillway is considered inadequate and the overtopping could result in the failure of the dam. (Author).

Author : CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher :
Page : 70 pages
File Size : 37,54 MB
Release : 1978
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The dam consists of a 260 ft. long granite-faced earth dam with spillway, flume, and outlet culvert consisting of granite masonry and concrete. It is small in size with a significant hazard potential classification. It is in fair condition. Although there is no immediate concern, features revealed by this inspection do require attention. A formal sequenced operation plan for emergencies involving upstream and downstream dam operations should be developed and submitted to the NHWRB for review and comment.

Author : CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher :
Page : 83 pages
File Size : 28,72 MB
Release : 1978
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The dam is a 404 ft. long, earth-filled rock crib which incorporates a 58 ft. long spillway and a 42 inch diameter steel pipe outlet controlled by a stoplog weir. It is intermediate in size with a significant hazard potential. The dam is in poor condition at the present time. The dam requires considerable maintenance. (Author).

Author : CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher :
Page : 120 pages
File Size : 31,45 MB
Release : 1980
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St. Pauls School Dam is a concrete overflow section approximately 15 ft. high from the bottom of the upstream channel to the top of the training walls and approximately 100 ft. long between the training walls. The upstream face of the concrete section is vertical and measures approximately 9 ft. from its crest to a concrete apron on the channel bottom. The dam is in fair condition at the present ime, with a few major concerns which must be corrected. The size is intermediate with a significant hazard potential. The dam could be damaged by the discharge over the abutments. It is not anticipated that lives would be lost. Keywords include: Visual inspection, Dam safety, Merrimack River Basin, Concord New Hampshire, and Turkey River.