Pactola Dam

Pactola Dam Quick Facts

Location: Pennington, South Dakota
Coordinates: 44.0744, -103.4888
River: Rapid Creek River
Primary Purpose: Flood Risk Reduction
Type: Earth
Commissioned: 1959
Dam Height: 245 ft (75 m)
Dam Length: 1,255 ft (383 m)
Dam Capacity: 140,898 acre-ft (173,795 Ml)
Condition Assessment: Not Available
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Pactola Dam Map

Pactola Dam Information

Pactola Dam is an earthen embankment dam located about 15 miles from Rapid City, Pennington, South Dakota.

The dam, which is on the Rapid Creek River, was primarily built for Flood Risk Reduction purposes, but also serves for Irrigation, Recreation and Water Supply benefits.

The dam was designed by US Bureau of Reclamation and commissioned in 1959 and is currently owned by US Bureau of Reclamation.

Pactola Dam Structure

The Pactola Dam is approximately 1,255 feet (383 m) long, 245 feet (75 m) high and has a structural volume of 4,532,000 cubic yards (3,464,963 cubic metres).

Pactola Dam Storage Capacity & Surface Area

The reservoir has a normal storage capacity of 55,965 acre-ft (69,032 Ml) and maximum capacity of 140,898 acre-ft (173,795 Ml).

The surface area of the reservoir is 1,557 acres (630 ha) and the total catchment area is 229 square miles (593 square kilometres).

Pactola Dam Spillway

The dam spillway has a maximum discharge capacity of 255000 cubic feet per second (7221 cubic metres per second).

Pactola Dam Compared to Five Famous American Dams

Height (ft)
Length (Ft)
Storage Volume (acre-ft)
Drainage Area (sq miles)
 
Pactola Dam
Pennington, South Dakota
Height (ft)
245
Length (Ft)
1,255
Storage Volume (acre-ft)
140,898
Drainage Area (sq miles)
229
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

Pactola Dam Weather

Current Conditions at Pactola Dam

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7-Day Forecast for Pactola Dam

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Pactola Dam Frequently Asked Questions

In which state is the Pactola Dam?

Pactola Dam is in South Dakota.

In which county is the Pactola Dam?

Pactola Dam is in Pennington County.

How high is the Pactola Dam?

Pactola Dam is 245 feet high.

How long is the Pactola Dam?

Pactola Dam is 1,255 feet long.

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More Dams in Pennington County:

Deerfield Dam
Pactola Dam
Sheridan Lake Dam

More Dams in South Dakota:

Angostura Dam
Belle Fourche Dam
Carthage Dam
Columbia Road Dam
Deerfield Dam
East Vermillion Dam
Elm Lake Dam
Grizzly Gulch Tailings Dam
Houghton Dam
Lacreek #10 Dam
Lacreek Dam No. 9
Lake Wanalain Dam
Mina Dam
Mitchell Dam
Oglala Dam
Pactola Dam
Redfield Lake Dam
Richmond Dam
Shadehill Dam
Sheridan Lake Dam
Willow Creek 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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