The warning system to be used in the event of an emergency at Exelon Power's Muddy Run Pumped Storage Facility in Lancaster County will be tested next week.

During the test, scheduled for about 10 a.m. on Thursday, a brief tone will sound, followed by the words "this is a test, this is a test." The test will last approximately two minutes. No action by the public or any county or local emergency organization is necessary during the test.

The system, designed to warn the owners and residents of cottages along a stretch of Conowingo Pond in the event of an emergency at Muddy Run, consists of six sets of loudspeakers mounted atop poles upstream and downstream of the facility. These poles were installed in Drumore Township, Lancaster County, and Lower Chanceford and Peach Bottom townships in York County.

Exelon Power installed the system in 2003 as an additional method of warning the public, specifically cottage owners along the Susquehanna River.

As part of Muddy Run's emergency preparedness plans, the system is sounded every three months, on the second Thursday of January, April, July and October of each year at approximately 10 a.m.

In the event of a real emergency, a tone will sound, followed by the words, "this is an emergency, please move to higher ground, this is an emergency, please move to higher ground."

Muddy Run Pumped Storage Facility is an electric generating station operated by Exelon Generation Company, LLC.


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Muddy Run, which was built in 1968, includes a 1,000-acre, 250-foot deep reservoir, by the construction of a 4,800-foot-long, 250-foot-high, rock-filled dam.

The dam is inspected regularly, is equipped with instrumentation to monitor its condition, and undergoes regular maintenance. The continues to perform well, Excelon said.

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