Tolt River - South Fork Dam

Tolt River – South Fork Dam Quick Facts

Location: King, Washington
Coordinates: 47.693, -121.6887
River: South Fork Tolt River
Primary Purpose: Water Supply
Type: Earth
Commissioned: 1962
Dam Height: 200 ft (61 m)
Dam Length: 980 ft (299 m)
Dam Capacity: 68,400 acre-ft (84,370 Ml)
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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 Five Famous American Dams

Height (ft)
Length (Ft)
Storage Volume (acre-ft)
Drainage Area (sq miles)
 
Tolt River – South Fork Dam
King, Washington
Height (ft)
200
Length (Ft)
980
Storage Volume (acre-ft)
68,400
Drainage Area (sq miles)
19
Hoover Dam
Clark County, Nevada
Height (ft)
730
Length (Ft)
1,244
Storage Volume (acre-ft)
30,237,000
Drainage Area (sq miles)
167,800
Grand Coulee Dam
Okanogan County, Washington
Height (ft)
550
Length (Ft)
5,673
Storage Volume (acre-ft)
9,562,0000
Drainage Area (sq miles)
74,100
Theodore Roosevelt Dam
Maricopa County, Arizona
Height (ft)
357
Length (Ft)
1,208
Storage Volume (acre-ft)
3,411,500
Drainage Area (sq miles)
5,736
Oroville Dam
Butte County, California
Height (ft)
235
Length (Ft)
6,920
Storage Volume (acre-ft)
3,540,000
Drainage Area (sq miles)
3,611
Glen Canyon Dam
Coconino County, Arizona
Height (ft)
216
Length (Ft)
1,565
Storage Volume (acre-ft)
29,875,000
Drainage Area (sq miles)
108,355

Tolt River – South Fork Dam Weather

Current Conditions at Tolt River – South Fork Dam

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7-Day Forecast for Tolt River – South Fork Dam

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Tolt River – South Fork Dam Frequently Asked Questions

In which state is the Tolt River – South Fork Dam?

Tolt River – South Fork Dam is in Washington.

In which county is the Tolt River – South Fork Dam?

Tolt River – South Fork Dam is in King County.

How high is the Tolt River – South Fork Dam?

Tolt River – South Fork Dam is 200 feet high.

How long is the Tolt River – South Fork Dam?

Tolt River – South Fork Dam is 980 feet long.

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Lower North River # 81c Dam
Lower North River # 82 Dam
Pawtuckaway Lake /Drowns Dam
Pawtuckaway Lake Dollof Dam
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Tolt River - South Fork 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

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