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The Conowingo Dam (also Conowingo Hydroelectric Plant, Conowingo Hydroelectric Station) is a large hydroelectric dam in the lower Susquehanna River near the town of Conowingo, Maryland. The medium-height, masonry gravity dam is one of the largest non-federal hydroelectric dams in the U.S., and the largest dam in the state of Maryland.
The environmental group American Rivers named the Susquehanna "America's Most Endangered River for 2005" because of the excessive pollution it receives. Most of the pollution in the river is caused by excess animal manure from farming, agricultural runoff, urban and suburban stormwater runoff, and raw or inadequately treated sewage.
The 13,000 pounds of snakehead harvested from the Conowingo were sent to J.J. McDonnell and Co. Inc., a seafood wholesaler south of Baltimore in Elkridge, Maryland, for processing.
Shamokin Dam: 0: PA: Original low head navigation and canal feeder. Demolished 1904. Adam T. Bower Memorial Dam near Sunbury, Pennsylvania: 8 ft (2.4 m) 0: PA: Shamokin Dam power plant low head dam: 0: PA: Clarks Ferry Dam: 0: PA: Canal for the Wiconisco Canal around the site of Clarks Ferry Bridge. Demolished. Dock Street Dam: 6 ft (1.8 m) 0 ...
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A new town, named Conowingo Village, was created in 1928, on the Harford County side of the dam. It was initially a company town to house the dam's plant managers and workers. From the 1980s to 2000, the power company leased the homes to non-workers. In October 2000, the village was shuttered.
The Conowingo Dam followed in 1928. The Safe Harbor Dam had the largest effect on the river ecosystem. When it first closed its gates on September 29, 1931, it flooded more than 10 miles of the upper Conejohela Flats, creating the artificial Lake Clarke .
The lower reservoir is the Conowingo Reservoir, created in the Susquehanna River by the Conowingo Dam, with a normal pool elevation of 109 feet (33 m). The power house uses excess grid capacity during off peak hours to pump water from the Conowingo Reservoir into the upper reservoir through four 25-foot (7.6 m) diameter, 343-foot (105 m ...