Rock Island Dam

Rock Island Dam Quick Facts

Location: Douglas, Washington
Coordinates: 47.342359, -120.094324
River: Columbia River
Primary Purpose: Hydroelectric
Type: Gravity
Commissioned: 1932
Dam Height: 71 ft (22 m)
Dam Length: 3,108 ft (947 m)
Dam Capacity: 131,000 acre-ft (161,586 Ml)
Condition Assessment: Satisfactory
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Rock Island Dam Map

Rock Island Dam Information

Rock Island Dam is a gravity dam located about 32 miles from Vantage, Wa, Douglas, Washington.

The dam, which is on the Columbia River, was primarily built for Hydroelectric purposes, but also serves for Flood Risk Reduction benefits.

The dam was designed by Stone & Webster Engineering Corporation and commissioned in 1932 and is currently owned by PUD #1 of Chelan County, WA.

Rock Island Dam Structure

The Rock Island Dam is approximately 3,108 feet (947 m) long, 71 feet (22 m) high and has a structural volume of 0 cubic yards (0 cubic metres).

Rock Island Dam Storage Capacity & Surface Area

The reservoir has a normal storage capacity of 113,700 acre-ft (140,247 Ml) and maximum capacity of 131,000 acre-ft (161,586 Ml).

The surface area of the reservoir is 3,120 acres (1,263 ha) and the total catchment area is 89,400 square miles (231,545 square kilometres).

Rock Island Dam Spillway

The dam spillway has a maximum discharge capacity of 920000 cubic feet per second (26051 cubic metres per second).

Rock Island Dam Compared to Five Famous American Dams

Height (ft)
Length (Ft)
Storage Volume (acre-ft)
Drainage Area (sq miles)
 
Rock Island Dam
Douglas, Washington
Height (ft)
71
Length (Ft)
3,108
Storage Volume (acre-ft)
131,000
Drainage Area (sq miles)
89,400
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

Rock Island Dam Weather

Current Conditions at Rock Island Dam

Parameter Value
Current Time 17:04
Sunrise 07:01
Sunset 16:28
Temperature (°F) 50
Feels Like (°F) 46
Cloud Coverage (%) 0
Pressure (inHg) 1013
Humidity (%) 67
Wind Speed (mph) 8
Rain (mm) 0

7-Day Forecast for Rock Island 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 41 54 51 1013 54 8 18 WSW 63 0 light rain
Wed 43 47 47 1005 96 9 19 SSE 100 12 moderate rain
Thu 41 52 50 1011 75 5 6 NW 38 0 light rain
Fri 37 49 44 1015 56 7 7 NW 0 - scattered clouds
Sat 34 44 40 1019 63 6 5 NW 0 - broken clouds
Sun 36 48 44 1004 72 23 39 W 59 1 light rain
Mon 33 44 38 1012 61 6 8 NW 0 - overcast clouds
Tue 31 42 36 1031 58 6 5 NW 0 - broken clouds

Rock Island Dam Frequently Asked Questions

In which state is the Rock Island Dam?

Rock Island Dam is in Washington.

In which county is the Rock Island Dam?

Rock Island Dam is in Douglas County.

How high is the Rock Island Dam?

Rock Island Dam is 71 feet high.

How long is the Rock Island Dam?

Rock Island Dam is 3,108 feet long.

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More Dams in Douglas County:

Berry Creek Dam
Cooper Creek (Sutherlin) Dam
Dog River Reservoir Dam
Douglas County State Lake Dam
Galesville Dam
Horse Spring Coulee Dam
Lake Aaron Dam
Lake Geneva Dam
Lake Miltona Dam
Leader Lake Dam
Lemolo No 1 Dam
Lone Star Lake Dam
Lower Eau Claire Lake Dam
Mud Lake Dam
Newport Landing Dam
Papio Creek 15-A Dam
Rock Island Dam
Rueter Hess Dam
Saint Croix Dam
Strontia Springs Dam
Tahkenitch Lake Dam
Zosel 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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