Morgan Falls Dam, Hydroelectric dam in Sandy Springs, United States.

Morgan Falls Dam is a 896-foot-long, 56-foot-tall gravity dam on the Chattahoochee River at the northern end of Sandy Springs, Georgia, crossing into Cobb County. Completed in 1904, it impounds Bull Sluice Lake upstream. The concrete structure houses a hydroelectric plant authorized for 16,800 kW.

Built in 1904 by Georgia Power, Morgan Falls Dam supplied electricity to Atlanta's streetcars and was then by far the largest hydroelectric plant in the state. It was named for the recently deceased mother of Georgia Power president S. Morgan Smith, whose maiden name was Morgan. In 1924 it was rebuilt as a 60-cycle plant rated at 15,000 kW, up from the original 10,500 kW, and in 1957 it was raised to regulate flow from Buford Dam, 36 miles upstream.

The dam is named for the mother of Georgia Power president S. Morgan Smith, whose maiden name was Morgan; she had died shortly before construction. The reservoir it created is called Bull Sluice Lake. Upstream, the former rapids became a wetland where beavers, muskrats, waterfowl, songbirds and migrating birds are watched today.

The dam lies at the northern end of Sandy Springs and crosses the Chattahoochee into eastern Cobb County. Its 896-foot length and 56-foot height are best seen from the riverbanks on either side. Because the structure was raised in 1957 to regulate releases from Buford Dam, 36 miles upstream, flow levels can shift with upstream operations.

The dam's 1957 raising was not for power but to hold back releases from Buford Dam, 36 miles upstream, so Atlanta could draw water when demand peaked. The impoundment behind it, Bull Sluice Lake, replaced a narrow stretch of Chattahoochee rapids with open water and marsh.