Quick Facts About Tolt River – South Fork Dam
Tolt River – South Fork Dam Map
Tolt River – South Fork Dam Information
Tolt River – South Fork Dam is an earthen embankment dam located about 16 miles from Carnation, King, Washington.
The dam, which is on the South Fork Tolt River, was primarily built for Water Supply purposes, but also serves for Hydroelectric benefits.
The dam was designed by Carey & Kramer Consulting Engineers and commissioned in 1962 and is currently owned by City of Seattle.
Tolt River – South Fork Dam Structure
The Tolt River – South Fork Dam is approximately 980 feet (299 m) long, 200 feet (61 m) high and has a structural volume of 1,460,000 cubic yards (1,116,250 cubic metres).
Tolt River – South Fork Dam Storage Capacity & Surface Area
The reservoir has a normal storage capacity of 57,500 acre-ft (70,925 Ml) and maximum capacity of 68,400 acre-ft (84,370 Ml).
The surface area of the reservoir is 1,040 acres (421 ha) and the total catchment area is 19 square miles (49 square kilometres).
Tolt River – South Fork Dam Spillway
The dam spillway has a maximum discharge capacity of 13000 cubic feet per second (368 cubic metres per second).
Tolt River – South Fork Dam Compared to Four Famous American Dams
| Tolt River – South Fork Dam King, Washington |
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) | 200 | 730 | 550 | 357 | 216 |
| Length (Ft) | 980 | 1,244 | 5,673 | 6,920 | 1,565 |
| Storage Volume (acre-ft) | 68,400 | 30,237,000 | 9,562,000 | 3,540,000 | 29,875,000 |
| Drainage Area (sq miles) | 19 | 167,800 | 74,100 | 3,611 | 108,355 |
Tolt River – South Fork Dam Weather
Current Conditions at Tolt River – South Fork Dam
Failed to fetch current weather data.7-Day Forecast for Tolt River – South Fork Dam
Failed to fetch weather forecast data.Tolt River – South Fork Dam Frequently Asked Questions
Tolt River – South Fork Dam is in Washington.
Tolt River – South Fork Dam is in King County.
Tolt River – South Fork Dam is 200 feet high.
Tolt River – South Fork Dam is 980 feet long.
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Tolt River - South Fork Dam
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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