Mackay Dam, Idaho, USA

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Quick Facts About Mackay Dam

Location: Custer, Idaho
Coordinates: 43.9527, -113.6732
River: Big Lost River Sinks
Primary Purpose: Other
Type: Rockfill
Commissioned: 1918
Dam Height: 75 ft (23 m)
Dam Length: 1,430 ft (436 m)
Dam Capacity: acre-ft (0 Ml)

Mackay Dam Map

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Mackay Dam Information

Mackay Dam is dam located about 4 miles from Mackay, Custer, Idaho.

The dam, which is on the Big Lost River Sinks, was primarily built for Other purposes, but also serves for benefits.

The dam was designed by and commissioned in 1918 and is currently owned by .

Mackay Dam Structure

The Mackay Dam is approximately 1,430 feet (436 m) long, 75 feet (23 m) high and has a structural volume of cubic yards (0 cubic metres).

Mackay Dam Storage Capacity & Surface Area

The reservoir has a normal storage capacity of 45,000 acre-ft (55,507 Ml) and maximum capacity of acre-ft (0 Ml).

The surface area of the reservoir is 1,392 acres (563 ha) and the total catchment area is 788 square miles (2,041 square kilometres).

Mackay Dam Spillway

The dam has a 73 feet (22 m) wide uncontrolled spillway with a maximum discharge capacity of 7000 cubic feet per second (198 cubic metres per second).

Mackay Dam Compared to Four Famous American Dams

Mackay Dam
Custer, Idaho
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) 75 730 550 357 216
Length (Ft) 1,430 1,244 5,673 6,920 1,565
Storage Volume (acre-ft) 30,237,000 9,562,000 3,540,000 29,875,000
Drainage Area (sq miles) 788 167,800 74,100 3,611 108,355

Mackay Dam Weather

Current Conditions at Mackay Dam

Parameter Value
Current Time 19:17
Sunrise 07:30
Sunset 18:07
Temperature (°F) 23
Feels Like (°F) 15
Cloud Coverage (%) 91
Pressure (inHg) 1015
Humidity (%) 85
Wind Speed (mph) 6
Rain (mm) 0

7-Day Forecast for Mackay Dam

Day Min Temp (°F) Max Temp (°F) Feels Like (°F) Pressure (inHg) Humidity (%) Wind Speed (mph) Wind Gust (mph) Wind Dir Precip Prob (%) Precip Volume (mm) Weather
Today 15 33 27 1010 75 10 15 WNW 90 - light snow
Tue 9 30 22 1021 75 5 6 NW 0 - scattered clouds
Wed 12 30 23 1019 77 6 6 SSE 100 - light snow
Thu 13 32 30 1020 83 4 4 NW 0 - overcast clouds
Fri 11 32 27 1026 80 4 4 NW 0 - broken clouds
Sat 21 35 31 1026 80 4 5 SSE 0 - overcast clouds
Sun 25 39 37 1022 99 7 11 SSE 100 - light snow
Mon 23 39 33 1022 64 7 16 WNW 100 1 rain and snow

Mackay Dam Frequently Asked Questions

In which state is the Mackay Dam?

Mackay Dam is in Idaho.

In which county is the Mackay Dam?

Mackay Dam is in Custer County.

How high is the Mackay Dam?

Mackay Dam is 75 feet high.

How long is the Mackay Dam?

Mackay Dam is 1,430 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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