Wilbur D. Mills Lock and Dam, Arkansas, USA

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Quick Facts About Wilbur D. Mills Lock and Dam

Location: Arkansas, Arkansas
Coordinates: 33.988647, -91.3137311
River: Arkansas River
Primary Purpose: Navigation
Type: Concrete Gravity
Commissioned: 1967
Dam Height: 31 ft (9 m)
Dam Length: 10,000 ft (3,048 m)
Dam Capacity: 133,200 acre-ft (164,300 Ml)
Hazard Potential: Significant
Condition Assessment: Not Available

Wilbur D. Mills Lock and Dam Map

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Wilbur D. Mills Lock and Dam Information

Wilbur D. Mills Lock and Dam is a concrete gravity dam located in Akansas City, Arkansas, Arkansas.

The dam, which is on the Arkansas River, was primarily built for Navigation purposes, but also serves for Recreation benefits.

The dam was designed by CESWL and commissioned in 1967 and is currently owned by USACE – Little Rock District.

Wilbur D. Mills Lock and Dam Structure

The Wilbur D. Mills Lock and Dam is approximately 10,000 feet (3,048 m) long, 31 feet (9 m) high and has a structural volume of 845,000 cubic yards (646,049 cubic metres).

Wilbur D. Mills Lock and Dam Storage Capacity & Surface Area

The reservoir has a normal storage capacity of 110,080 acre-ft (135,781 Ml) and maximum capacity of 133,200 acre-ft (164,300 Ml).

The surface area of the reservoir is 10,600 acres (4,290 ha) and the total catchment area is 160,475 square miles (415,629 square kilometres).

Wilbur D. Mills Lock and Dam Spillway

The dam has a 960 feet (293 m) wide controlled spillway with a maximum discharge capacity of 371200 cubic feet per second (10511 cubic metres per second).

Wilbur D. Mills Lock and Dam Compared to Four Famous American Dams

Wilbur D. Mills Lock and Dam
Arkansas, Arkansas
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) 31 730 550 357 216
Length (Ft) 10,000 1,244 5,673 6,920 1,565
Storage Volume (acre-ft) 133,200 30,237,000 9,562,000 3,540,000 29,875,000
Drainage Area (sq miles) 160,475 167,800 74,100 3,611 108,355

Wilbur D. Mills Lock and Dam Weather

Current Conditions at Wilbur D. Mills Lock and Dam

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7-Day Forecast for Wilbur D. Mills Lock and Dam

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Wilbur D. Mills Lock and Dam Frequently Asked Questions

In which state is the Wilbur D. Mills Lock and Dam?

Wilbur D. Mills Lock and Dam is in Arkansas.

In which county is the Wilbur D. Mills Lock and Dam?

Wilbur D. Mills Lock and Dam is in Arkansas County.

How high is the Wilbur D. Mills Lock and Dam?

Wilbur D. Mills Lock and Dam is 31 feet high.

How long is the Wilbur D. Mills Lock and Dam?

Wilbur D. Mills Lock and Dam is 10,000 feet long.

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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