List of dams and reservoirs of the Susquehanna River

And by making it more Susquehanna specific.

The dams have a positive impact on the environment. They slow water, trapping silt and pollutants. Conowingo Dam[1] is credited with preventing much of the silt from Pennsylvania from reaching the Chesapeake Bay. The dam spillways can add oxygen to the water. The down stream side of dams is favored by aquatic birds, possibly because the fish that pass through the dam are a bit stunned. Conowingo Dam is noted for its bald eagles.[2] Hydroelectric power is considered an environmentally friendly method of power generation.

The dams also make a negative impact on the environment. They raise the water level, altering the riparian environment. The upstream pools can become environmentally unsound below the surface, especially during summer. They block migratory fish, such as the American shad. The dams from York Haven down to the Chesapeake all have fish ladders or lifts to mitigate this.

And by making it more Susquehanna specific.

The dams have both a positive and negative impact on human society, outside of the environmental impacts above.

River dams have long been associated with power generation. In the past dams powered mills directly. Today dams are used both for direct hydroelectric generation and to form pools for cooling other forms of generation. Dams create navigable stretches of river where they may have been unnavigable before. The first dams at Sunbury, Pennsylvania were to support year round ferry crossings.

The creation of dams does have negative impacts. Communities on the river edge are displaced, such as Conowingo, Bald Friar, and Glen Cove, Maryland in 1928. Longitudinal river navigation is impeded. Although the historic Susquehanna was very difficult to navigate most of the year. Timber rafts could come down in the spring high water, but very few boats went up the river, before the canals were built. The Conowingo Dam is located near "Smith's Falls", where John Smith had to turn back while exploring the region in the early 17th century due to the impassable rapids.

Listed from the headwaters toward the mouth of the river. This includes existing and historic structures, as well as dams off the river that have a major impact on the river. The river also grows its own ice dams during the winter and notable ones will be included.

• Foote, Peter S. "HISTORY OF THE DEVELOPMENT OF FISH PASSAGE FACILITIES AT FERC LICENSED PROJECTS ON THE LOWER SUSQUEHANNA RIVER" (PPS). The Louis Berger Group, Inc. Retrieved 2006-07-18.