National Dam Inspection Program Lower Lake Dam Ndi Pa 00306 Pa Der 52 144 Delaware River Basin East Branch Wallenpaupack Creek Pike County Pennsylvania Phase I Inspection Report
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| Author | : O'BRIEN AND GERE ENGINEERS INC PHILADELPHIA PA JUSTIN AND COURTNEY DIV. |
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| Total Pages | : 94 |
| Release | : 1979 |
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Lower Lake Dam is an earth embankment with a concrete gravity spillway. The embankment is approximately 340 feet in length with a maximum height of 22.5 feet. The dam inpounds a reservoir with a surface area of 250 acres and a storage capacity of 1,085 acre-feet at normal pool level. The top of the dam is 20 feet wide; the upstream and downstream side slopes are approximately 2.5 horizontal to 1.0 vertical (2.5H:1V). No information is available concerning the properties of the embankment materials. Within the embankment is a tapered reinforced concrete cutoff wall that extends from bedrock to 3.5 feet below the top of the embankment. The reinforced concrete spillway, which has maximum height of 13 feet from base to crest, consists of 3 sections separated by bridge piers. Each section id broad-crested weir with a vertical upstream face and a flat, sloping downstream face. The crest of the center section is 48.5 feet long and crest of each of the two end sections is 45.75 feet long. The crest of the center section, which is 3 feet wide, is 0.5 feet below the crest of the end sections; each of the end sections is 2.5 feet wide.
| Author | : O'BRIEN AND GERE ENGINEERS INC PHILADELPHIA PA JUSTIN AND COURTNEY DIV. |
| Publisher | : |
| Total Pages | : 78 |
| Release | : 1979 |
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| ISBN | : |
Promised Land Dam is an earth embankment approximately 125 feet long with a maximum height of 16 feet. The spillway is a broadcrested weir, approximately 33 feet long, located in the center of the embankment. The reservoir drain system consists of a 48 inch square conduit controlled by means of a stop-log structure. The dam impounds a 422 acre reservoir for recreation within the Promised Land State Park. Examination of the results of the hydrologic and hydraulic analyses indicates that the spillway is capable of passing 45 percent of the Probable Maximum Flood (PMF) without overtopping the embankment. Since the spillway cannot pass 50 percent of the PMF, which is the Spillway Design Flood (SDF), the spillway system is classified as 'Inadequate'. Based on visual observations made during the date of the inspection, the dam and its appurtenant structures are considered to be in fair condition. There is a low area at the top of dam near the right abutment, and bulges in the dry stone wall are evident. Seeps exist near the downstream toe on the right side of the dam. A large (50 foot high, 24 inch diameter) tree is adjacent to the downstream toe of the dam on the right side. Riprap protection to the upstream slope is missing. Some concrete surfaces have deteriorated due to spalling. (author).
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| Total Pages | : 368 |
| Release | : 1979 |
| Genre | : Science |
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| Author | : Bernard M. Mihalcin |
| Publisher | : |
| Total Pages | : 95 |
| Release | : 1981 |
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| ISBN | : |
Wild Acres Lake Dam is located on a branch of Hornbecks Creek in Delaware Township, Pike County, Pennsylvania. The facility is an integral part of the surrounding development known as Wild Acres. The community is nestled in the mountains of Pike County less than five miles west of U.S. Route 209 which parallels the Delaware River in this area. Observations made during the visual inspection indicate the embankment and adjacent dike are in good condition. Heavy brush growth and small trees were observed along the embankment crest and upstream face. No evidence of seepage through the downstream embankment face, excess settlement, sloughing, erosion or animal burrows was encountered by the inspection team. Some rock slope protection has been displaced immediately adjacent the spillway right wingwall, leaving small bare areas on both the upstream and downstream embankment faces. The top of the concrete corewall exhibits excessive cracking and spalling along its entire length except for that portion associated with the dike along the right abutment which is in relatively good condition.
| Author | : Hendrik Jongsma |
| Publisher | : |
| Total Pages | : 73 |
| Release | : 1980 |
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Based on the visual inspection, past performance and the available engineering data, the dam and its appurtenant structures appear to be in fair condition. In accordance with the Corps of Engineers' evaluation guidelines, the size classification of this dam is small and the hazard classification is high. These classifications indicate that the Spillway Design Flood (SDF) should be in the range of one-half the Probable Maximum Flood (PMF) to the full PMF. The recommended SDF for this flood control structure is the PMF. The spillway capacity is adequate for passing 71 percent of the PMF peak inflow without overtopping the dam. The spillway, therefore, is considered to be inadequate, but not seriously inadequate.
| Author | : Will M. Heiser |
| Publisher | : |
| Total Pages | : 60 |
| Release | : 1979 |
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Fawn Lake Dam is a homogeneous earth embankment structure provided with a blanket drain and a rock toe. The design includes provision of a key trench. The embankment is approximately 400 feet long and has a maximum height of 41 feet. A 90-foot long overflow spillway is located between the embankment and the left abutment. The dam is provided with 5 feet of freeboard above the spillway, crest. Spillway training walls extend both upstream and downstream of the spillway, as shown on Plate 4. A concrete apron extends 100 feet downstream of the spillway, and varies in width from 90 feet at the spillway to 25 feet at the outlet channel. A trapezoidal outlet channel is lined with grouted riprap for approximately 250 feet downstream of the apron. A 24-inch diameter reinforced concrete pipe is provided as a low level outlet. Flow through the pipe is controlled by a gate valve at the upstream toe of the embankment. The operating stem expands from the valve to the top of dam, and is supported on concrete columns embedded in the embankment.
| Author | : Frederick Futchko |
| Publisher | : |
| Total Pages | : 81 |
| Release | : 1980 |
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Maple Lake Dam is a homogeneous, earthfill embankment. It is 35 feet high at its maximum section and 685 feet long. The main spillway is located at the maximum section of the dam. It consists of a reinforced concrete riser structure near the upstream toe of the dam, a 24-inch diameter conduit, and a concrete outlet structure at the downstream toe of the dam. The auxiliary spillway is an excavated, trapezoidal channel at the left abutment of the dam. Based on visual inspection, available records, calculations, past operational performance, and according to criteria established for these studies, Maple Lake Dam is judged to be in good condition. Based on existing conditions, the main and auxiliary spillways will pass an approximate minimum of 48 percent of the Probable Maximum Flood (PMF before overtopping of the dam occurs. No stability problems were evident for the embankment at the time of the visual inspection, but a potential hazard to stability exists due to erosion that might occur when there is flow in the auxiliary spillway.
| Author | : Bernard M. Mihalcin |
| Publisher | : |
| Total Pages | : 74 |
| Release | : 1981 |
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Based on the visual inspection, operational history, and available engineering data, the dam and its appurtenances are considered to be in excellent condition. The size classification of the facility is small and the hazard classification is high. In accordance with the recommended guidelines, the Spillway Design Flood (SDF) ranges between the 1/2 PMF (Probable Maximum Flood) and the PMF. Since the facility is classified near the lower bounds of the small category, the SDF is considered to be the 1/2 PMF. Results of hydrologic and hydraulic analysis indicate that the facility is capable of accommodating about 76 percent of the PMF prior to embankment overtopping. As a result, the spillway is deemed adequate.
| Author | : Bernard M. Mihalcin |
| Publisher | : |
| Total Pages | : 63 |
| Release | : 1981 |
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The purpose is to determine if the dam constitutes a hazard to human life or property. Beaver Lake Lodge Dam is located on Raymondskill Creek in Milford Township, Pike County, Pennsylvania. The visual inspection of the facility suggested that the dam and its appurtenances are in poor condition. The overall appearance of the facility suggests it to be in poor condition. Remedial measures are necessary to: (1) repair to deteriorated concrete spillways, (2) remove the trees and overgrowth from the embankment crest and slopes, (3) provide adequate erosion protection along the downstream embankment toe, and (4) restore the operability of the outlet conduit, or provide an alternate means of reservoir drawdown.
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| Total Pages | : 105 |
| Release | : 1981 |
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Based on a visual inspection, operational history, and hydrologic and hydraulic analysis, the dam is considered to be in fair condition. The size classification of the facility is small and its hazard classification is considered to be high. In accordance with the recommended guidelines, the Spillway Design Flood (SDF) for the facility ranges between the 1/2 PMF (probable Maximum Flood) and the PMF. Since the facility is classified near the upper bounds of the small category with regard to available storage capacity, the SDF is considered to be the PMF. Results of the hydrologic and hydraulic analysis indicate that under existing conditions the facility will pass and/or store only about 17 percent of the PMF prior to embankment overtopping at the low area adjacent the left abutment. If the low area were regraded to the design top of dam, the spillway system would then pass about 28 percent of the PMF prior to embankment overtopping. Under existing conditions, spillway discharges are controlled by the existence of a township-owned roadway embankment and culvert that is situated about 100 feet downstream of the spillway weir.
