Middle Oconee-Walnut Creek 3 Dam (Clarks Hill - Strom Thurmond Lake)

Field Descriptions

Dam Name: Middle Oconee-Walnut Creek 3
NID ID: GA04290
Longitude: -83.80556
Latitude: 34.20639
County: HALL
River: CANDLER BRANCH
State: GA
Owner Name: HALL COUNTY AND UPPER CHATTAHOOCHEE RIVER SANDWCD
Owner Type: Local Government
Private Dam? No
Dam Type: Earth
Purposes: Flood Control
Year Completed: 1977
Dam Length: 570 feet
Dam Height: 37 feet
Maximum Discharge: 3120 cu ft/sec
Maximum Storage: 541 acre-feet
Normal Storage: 61 acre-feet
Surface Area: 9 acres
Drainage Area: 1.69 square miles
Hazard Potential: Low
Emergency Action Plan? Not Required By Submitting Agency
Inspection Date: 2001-01-01
Inspection Frequency: 5
State Regulated Dam? No
Spillway Type: Uncontrolled
Spillway Width: 100 feet
Volume of Dam: 56000 cubic yards
Federal Design Agency: U.S. Department of Agriculture;
Natural Resources Conservation Service
Formerly Soil Conservation Service (SCS)
Federal Construction Agency: U.S. Department of Agriculture;
Natural Resources Conservation Service
Formerly Soil Conservation Service (SCS)
Source Agency: U.S. Department of Agriculture;
Natural Resources Conservation Service
Formerly Soil Conservation Service (SCS)

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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