National Program For Inspection Of Non Federal Dams Badger Pond Dam Nh 00085 State No 2102 Merrimack River Basin Belmont New Hampshire Phase I Inspection Report

The masonry and concrete dam has a hydraulic height of 21 ft. and is 260 ft. long. The dam is in fair condition. Seepage near the downstream rockfill buttress and the north abutment are among major concerns. It is small in size with a high hazard classification. A major breach at spillway crest would probably result in the loss of 10 or more lives and could cause extensive property damage. (Author).

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.

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.

Sanborn Pond Outlet dam is an earthen embankment structure about 265 feet in overall length and a maximum height of 16.5 feet from crest of dam to downstream toe. The upstream and downstream faces consists of a 2 feet thick vertical dry stone masonry wall which extends the full height of the dam. Located about 105 feet from the left abutment is the principal spillway which consists of a 19 feet long spillway structure with vertical dry masonry training walls and flashboards. The dam in considered to be in poor condition with some major concern which must be corrected. It is intermediate in size with a significant hazard potential. Keywords include: Visual inspection, Dam safety, Merrimack River Basin, Louden, New Hampshire, and Sanborn Brook.

Berry Pond Dam is an earth embankment 185 feet long and 12 feet high, with a stop-logged spillway, 11 feet wide and 7 feet high. The dam was superimposed in 1967 upon an earlier rock crib dam built in 1884. Three pipes penetrate the dam, two of which are abandoned. The operative pipe, a gated 8 in. line, regulates flow through a man-made channel to a downstream water supply reservoir for the Town of Pittsfield. It is small in size with a low hazard classification. The dam's condition is rated as fair but deficiencies were found in freeboard, in emergency discharge provisions, and in draw-down capability. Keywords include: Inspection, Dam safety, Merrimack River Basin, Pittsfield, New Hampshire, and Tributary to Suncook River.

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.

The dam is an earthen embankment dam with a hydraulic height of 14 ft. and 422 ft. long. The dam is in poor condition. There are a few major concerns which must be corrected to assure the continued performance of the dam. It is small in size with a high hazard classification. The test flood may range from 1/2 to the Probable Maximum Flood. The PMF was selected as the test flood because of the potential for loss of life and poor condition of the dam. (Author).

The dam is composed of three main sections including an earth dike with stone masonry retaining wall, a concrete dike section and a solid concrete spillway section. It is small in size with a significant hazard classification. The dam was found to be in fair condition based on a limited spillway capacity of only 52 percent of the test flood. (Author).

The dam is a 450 ft. long, 35 ft. high earthfill dam with cemented rubble stone masonry core walls. The dam is intermediate in size with a significant hazard potential. The test flood is taken as 1/2 of the PMF. Generally the dam is in fair condition. (Author).

The dam is 223 ft. long and about 14 ft. high. The dam is intermediate in size with a hazard potential of significant. The dam is in good condition at the present time. Only a few relatively minor operating and maintenance improvements are necessary. The owner should implement a formal, written flood and emergency warning system. (Author).