Quick Facts About Yonah Dam
Yonah Dam Map
Yonah Dam Information
Yonah Dam is a gravity dam located about 9 miles from Madison, Oconee, South Carolina.
The dam, which is on the Tugalo River, was primarily built for Hydroelectric purposes, but also serves for Fish and Wildlife Pond and Recreation benefits.
The dam was designed by and commissioned in 1925 and is currently owned by Georgia Power Company.
Yonah Dam Structure
The Yonah Dam is approximately 980 feet (299 m) long, 90 feet (27 m) high and has a structural volume of cubic yards (0 cubic metres).
Yonah Dam Storage Capacity & Surface Area
The reservoir has a normal storage capacity of 10,200 acre-ft (12,581 Ml) and maximum capacity of 10,200 acre-ft (12,581 Ml).
The surface area of the reservoir is 325 acres (132 ha) and the total catchment area is 470 square miles (1,217 square kilometres).
Yonah Dam Spillway
The dam has a 450 feet (137 m) wide uncontrolled spillway with a maximum discharge capacity of 106000 cubic feet per second (3002 cubic metres per second).
Yonah Dam Compared to Four Famous American Dams
| Yonah Dam Oconee, South Carolina |
Hoover Dam Clark County, Nevada |
Grand Coulee Dam Okanogan County, Washington |
Theodore Roosevelt Dam Maricopa County, Arizona |
Glen Canyon Dam Coconino County, Arizona |
|
|---|---|---|---|---|---|
| Height (ft) | 90 | 730 | 550 | 357 | 216 |
| Length (Ft) | 980 | 1,244 | 5,673 | 6,920 | 1,565 |
| Storage Volume (acre-ft) | 10,200 | 30,237,000 | 9,562,000 | 3,540,000 | 29,875,000 |
| Drainage Area (sq miles) | 470 | 167,800 | 74,100 | 3,611 | 108,355 |
Yonah Dam Weather
Current Conditions at Yonah Dam
Failed to fetch current weather data.7-Day Forecast for Yonah Dam
Failed to fetch weather forecast data.Yonah Dam Frequently Asked Questions
Yonah Dam is in South Carolina.
Yonah Dam is in Oconee County.
Yonah Dam is 90 feet high.
Yonah Dam is 980 feet long.
More Dams in Oconee County:
Bad Creek Main DamClemson Lower Diversion Dam
Clemson Upper Diversion Dam
Keowee Dam
Yonah Dam
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Yonah Dam
Condition Assessment Classification
Satisfactory
No existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor
A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
High
Dams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner’s property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
Source: National Inventory of Dams