MAHANOY CITY — The Lofty Reservoir Dam upgrade project continues to progress with the plan to have it substantially completed by December.
The reservoir is owned by the Mahanoy Township Authority and is required to be upgraded by raising the dam breast 4 feet to improve safety during heavy rain events. The state Department of Environmental Protection ordered the authority raise the dam breast and make other improvements. The Ashland Area Municipal Authority has substantially completed a similar upgrade project that raised its reservoir in Butler Township by 5 feet.
Raising the dam breast will prevent water from flowing over the wall and force the water to use the spillway for better control and safety.
The authority board received an update on the project during its workshop and meeting on Wednesday from Alfred Benesch & Co. project managers James J. Rhoades Jr. and Jennifer M. Kowalonek.
According to Kowalonek, the project work began June 14 and is 75 percent complete and, barring the unexpected, may be done by Christmas so the dam is operational and can hold water. Landscaping will wait until the spring when temperatures moderate enough for seeding,
The project includes improvements to raise the dam breast, control seepage, rehabilitate upstream embankment, upgrade the spillway and repair the outlet. The overall project also includes installation of modern water meters for customers throughout the authority’s distribution system.
Performance Construction Services Inc., Harrisburg, is the general contractor. Overall construction cost is $3.7 million and, after adding other costs, such as engineering, permitting, legal and others, the total cost is $5.4 million.
Project funding comes from a Commonwealth Financing Authority grant of $1,666,667, with the rest paid through a 20-year Pennsylvania Infrastructure Investment Authority loan at 1 percent interest.
The Lofty Dam, located in Kline Township, serves as a DEP-permitted public water supply source. It is an earthen embankment 1,100 feet long and 28 feet high. The impoundment covers 31 acres and contains 118 million gallons of water. MTA public water serves a population of about 7,000 through 2,800 connections in the boroughs of Mahanoy City and Gilberton and the villages of Bowmans, Boston Run, Maple Hill and other areas of Mahanoy Township, including undeveloped residential and commercial properties with potential for growth.
Typically, the authority pumps in excess of 60 million gallons annually from this source to meet customer demands. The Lofty Dam area will continue to be part of the state Game Commission’s Forest-Game Cooperative Program, where the area is open to the public for hunting and trapping.
In 1989, MTA sold the dam and 1,068 acres to the state game commission with the intent to have the PGC rehabilitate the dam. In 1998, DEP’s Bureau of Dam Safety performed an inspection on the embankment and expressed concern with the seepage, and deteriorated conditions of the embankment and the spillway. Subsequently, the spillway was repaired in accordance with the state agency’s recommendations. In 1999, inspections determined that seepage and embankment conditions continued to deteriorate. Based on this, the Bureau of Dam Safety requested the seepage and embankment conditions be corrected and stabilized. An alternative was to draw down and breach the reservoir. Since the dam is used as a public water supply source, breaching was not a viable option.
After years of legal dealings, in 2005 the MTA was forced to take back ownership as the PGC refused to rehabilitate the dam.
The extensive work led to the draining of the reservoir. Kowalonek said that when the dam was built about 100 years ago, the foundation was not properly placed, prompting additional work.
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