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Raystown Dam

Raystown Dam, managed by the U.S. Army Corps of Engineers (Corps), is located on the Raystown Branch of the Juniata River, about 5.5 miles upstream from its confluence with the Juniata River and 92 miles above the confluence of the Juniata River with the Susquehanna River. Raystown Dam and Raystown Lake are located in south central Pennsylvania in Huntingdon County, near the borough of Huntingdon. Construction of the dam began in October 1968 and was completed in October 1973. Raystown Dam, which is 225 feet high, consists of a rolled earth and rockfill embankment with a gated spillway in the right abutment, the top 3.5 feet of ungated spillway being a fuse plug of erodible backfill material. The gated spillway is controlled by two 45-foot square tainter gates and is equipped with a warm water outlet system with a 4.75-foot by 6.75-foot slide gate served by inlet ports at three levels. There is a low-level outlet tunnel with two 5.5 foot by 10-foot gates.

Project Name Raystown
LIHI Certificate Number 23
LIHI Effective and
Expiration Dates
August 11, 2014
August 11, 2022
Owner Allegheny Electric Cooperative
State Pennsylvania
Location Located on the Raystown Branch of the Juniata River, in Huntingdon County in south central Pennsylvania.
Installed Capacity 21 MW
Average Annual Generation 87,895,876 KWh (1996-2005)
Facility Type
FERC No. 2769

The Allegheny Electric Cooperative (AEC) operates the 21 megawatt (rated capacity) Raystown Hydroelectric Project (William F. Matson Generating Station) at Raystown Lake. The hydroelectric station, completed in 1988, is located at the base of Raystown Dam and is operated in close cooperation with the Corps. The Corps gives all flow and temperature regulating instructions to AEC. Constant flow discharges are adjusted on a daily basis to minimize fluctuations downstream.

The hydroelectric station control facilities are separate from those of the Corps facilities. The hydroelectric station intake tower has the capability of withdrawing water from different levels of the lake for downstream temperature control. Intake trash rack clear spacing is 3 inches. Flow velocities at the intake are maintained at less than or equal to 3 feet per second. The concrete tunnel stretching from the intake tower to the powerhouse is 12 feet in diameter, steel-lined, and 930 feet long. The steel penstock is 12 feet in diameter and 550 feet long. There are two power-generating units in the powerhouse. Unit 1 has a flow range of 200 to 600 cubic feet per second (cfs) and a rated output of 7 megawatts. Unit 2 has a flow range of 500 to 1100 cfs and a rated output of 14 megawatts. 22 adjustable wicket gates control flow through each unit. Flow is also regulated by the closure of two turbine shut-off valves located upstream of the generating units. Flow through the tunnel, penstock, and powerhouse can be regulated by the closure of a 12-foot square wheel gate located in the intake structure.

Certification History

February 20, 2015: The Raystown Hydroelectric Project (FERC No. 2769), LIHI Certificate No. 23 has been determined by the Executive Director, Michael J. Sale to continue to satisfy the requirements of the Low Impact Hydropower Institute (LIHI) Certification Program. The Raystown Project is located on the Raystown Branch of the Juniata River, in Huntingdon County in south central Pennsylvania.

In rendering this Certification, the Institute’s Executive Director used authority delegated by the LIHI Governing Board and the unanimous recommendation by the LIHI Governing Board Technical Committee resulting from a full review of the Application Reviewer’s report and all public comments and additional materials provided by the Applicant.  The decision to certify the Raystown Creek Hydroelectric Project is for an 8-year term, effective August 11, 2014 and expiring August 11, 2022, with the following condition:

“Along with its annual compliance letter, AEC shall include an update on any changes in PFBC’s downstream fisheries management objectives that may have occurred or have been discussed over the past year. AEC shall cooperate with PFBC on any studies related to new coldwater fisheries management downstream of the facility, subject to the fact that the Corps of Engineers will have final say over structural or operational changes at their dam. AEC shall keep LIHI apprised of developments in this area on an annual basis.”

June 4, 2014: The Low Impact Hydropower Institute has received an application for a second term of certification of the Raystown Hydroelectric Project. The current certificate term is set to expire on August 11, 2014, but has been extended to March 31, 2015 to allow for internal review of the application for an additional term. The application materials can be found in the “Files” section below.

January 22, 2007: The Raystown Hydroelectric Project has been certified as low impact for an eight year term, effective August 11, 2006 and expiring August 11, 2014.

August 11, 2006: Allegheny Electric Cooperative has submitted an application for the certification of the Raystown Hydroelectric Project.


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