St. Stephen Powerhouse Dam (Lake Moultrie)

Field Descriptions

Dam Name: St. Stephen Powerhouse
Other Name: LAKE MOULTRIE
NID ID: SC82201
Longitude: -79.93333
Latitude: 33.4227
County: BERKELEY
River: COOPER/SANTEE
State: SC
Nearest City: ST.STEPHEN, SC.
Distance: 2.00 miles
Owner Name: CESAC
Owner Type: Federal
Dam Designer: CENWO
Private Dam? No
Dam Type: Gravity
Core: Concrete (Type)
Foundation: R
Purposes: Hydroelectric
Year Completed: 1985
Dam Length: 965 feet
Structural Height: 128 feet
Hydraulic Height: 75 feet
Maximum Discharge: 24500 cu ft/sec
Maximum Storage: 2560000 acre-feet
Hazard Potential: Significant
Emergency Action Plan? Yes
Inspection Date: 2008-01-18
Inspection Frequency: 5
State Regulated Dam? No
Spillway Width: 0 feet
Outlet Gates: None
Volume of Dam: 700000 cubic yards
Federal Funding Agency: LAKE MOULTRIE
Federal Design Agency: Department of Defense;
U.S. Army Corps of Engineers
Federal Construction Agency: Department of Defense;
U.S. Army Corps of Engineers
Federal Regulatory Agency: Department of Defense;
U.S. Army Corps of Engineers
Federal Inspection Agency: CE
Federal Operating Agency: Department of Defense;
U.S. Army Corps of Engineers
Federal Owner (Agency): Department of Defense;
U.S. Army Corps of Engineers
Other Federal Agencies: Department of Defense;
U.S. Army Corps of Engineers
Source Agency: Department of Defense;
U.S. Army Corps of Engineers

Dam Safety For Boats

A large amount of water can be released from a dam without any warning at any time and by any means. For example, when the demand for electricity is high, the turbines at a dam may be turned on automatically, resulting in a significant increase in the downstream flow of water in only a matter of seconds.

If there's a need to release water through the sluiceways (outlets at the base of the dam), this operation can also create a great swell of discharged water downstream.

During flood operations, any or all spillway gates across the width of a dam can be opened to release upstream flood water that needs to pass to the next downstream reservoir. Upstream or downstream, even the most experienced boater with the strongest motor is no match for this strong flow of water plunging over a spillway of a dam. Even if you're boating far downstream of a spilling dam, recirculating current can pull a powerful boat upstream toward plunging water that could shred any boat.

Some dams equipped with navigation locks create turbulent water as well. When vessels pass through, strong flow is released near the exhaust ports of the wing wall of the lock.

Warning Systems At Dams

To warn reservoir users of potential danger, warning devices are installed at many dams:






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