Lock and Dam No 8

Lock and Dam No 8 Quick Facts

Location: Union, Arkansas
Coordinates: 33.301667, -92.4633333
River: Ouachita River
Primary Purpose: Navigation
Type: Gravity
Commissioned: 1911
Dam Height: 25 ft (8 m)
Dam Length: 334 ft (102 m)
Dam Capacity: 85,000 acre-ft (104,846 Ml)
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Lock and Dam No 8 Map

Lock and Dam No 8 Information

Lock and Dam No 8 is a gravity dam located in None, Union, Arkansas.

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

The dam was designed by and commissioned in 1911 and is currently owned by DAEN LMK.

Lock and Dam No 8 Structure

The Lock and Dam No 8 is approximately 334 feet (102 m) long, 25 feet (8 m) high and has a structural volume of 0 cubic yards (0 cubic metres).

Lock and Dam No 8 Storage Capacity & Surface Area

The reservoir has a normal storage capacity of 59,200 acre-ft (73,022 Ml) and maximum capacity of 85,000 acre-ft (104,846 Ml).

The surface area of the reservoir is acres (0 ha) and the total catchment area is square miles (0 square kilometres).

Lock and Dam No 8 Spillway

The dam spillway has a maximum discharge capacity of 6500 cubic feet per second (184 cubic metres per second).

Lock and Dam No 8 Compared to Five Famous American Dams

Height (ft)
Length (Ft)
Storage Volume (acre-ft)
Drainage Area (sq miles)
 
Lock and Dam No 8
Union, Arkansas
Height (ft)
25
Length (Ft)
334
Storage Volume (acre-ft)
85,000
Drainage Area (sq miles)
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

Lock and Dam No 8 Weather

Current Conditions at Lock and Dam No 8

Parameter Value
Current Time 19:41
Sunrise 06:38
Sunset 17:09
Temperature (°F) 56
Feels Like (°F) 55
Cloud Coverage (%) 3
Pressure (inHg) 1016
Humidity (%) 76
Wind Speed (mph) 5
Rain (mm) 0

7-Day Forecast for Lock and Dam No 8

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 51 73 67 1018 45 7 18 ENE 0 - few clouds
Wed 57 73 66 1014 98 10 24 NW 97 3 light rain
Thu 47 71 64 1019 33 9 26 NW 0 - clear sky
Fri 46 70 64 1021 46 5 10 E 0 - clear sky
Sat 47 72 69 1018 43 5 9 SE 0 - clear sky
Sun 50 75 72 1018 48 6 17 S 0 - broken clouds
Mon 57 73 73 1012 62 12 33 SSE 0 - broken clouds
Tue 66 74 74 1009 73 11 30 S 63 1 light rain

Lock and Dam No 8 Frequently Asked Questions

In which state is the Lock and Dam No 8?

Lock and Dam No 8 is in Arkansas.

In which county is the Lock and Dam No 8?

Lock and Dam No 8 is in Union County.

How high is the Lock and Dam No 8?

Lock and Dam No 8 is 25 feet high.

How long is the Lock and Dam No 8?

Lock and Dam No 8 is 334 feet long.

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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

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