Wanapum Dam Quick Facts
Wanapum Dam Map
Wanapum Dam Information
Wanapum Dam is a gravity concrete rockfill dam located about 76 miles from Richland, Wa, Kittitas, Washington.
The dam, which is on the Columbia River, was primarily built for Hydroelectric purposes, but also serves for Recreation and Flood Risk Reduction benefits.
The dam was designed by Harza Engineering Corporation and commissioned in 1965 and is currently owned by Grant County PUD.
Wanapum Dam Structure
The Wanapum Dam is approximately 8,639 feet (2,633 m) long, 93 feet (28 m) high and has a structural volume of 5,795,000 cubic yards (4,430,596 cubic metres).
Wanapum Dam Storage Capacity & Surface Area
The reservoir has a normal storage capacity of 590,000 acre-ft (727,753 Ml) and maximum capacity of 796,000 acre-ft (981,850 Ml).
The surface area of the reservoir is 14,590 acres (5,904 ha) and the total catchment area is 95,000 square miles (246,049 square kilometres).
Wanapum Dam Spillway
The dam has a 832 feet (254 m) wide controlled spillway with a maximum discharge capacity of 1400000 cubic feet per second (39644 cubic metres per second).
Wanapum Dam Compared to Five Famous American Dams
Wanapum Dam Weather
Current Conditions at Wanapum Dam
| Parameter | Value |
|---|---|
| Current Time | 21:24 |
| Sunrise | 07:18 |
| Sunset | 18:12 |
| Temperature (°F) | 59 |
| Feels Like (°F) | 58 |
| Cloud Coverage (%) | 100 |
| Pressure (inHg) | 1012 |
| Humidity (%) | 61 |
| Wind Speed (mph) | 11 |
| Rain (mm) | 0 |
7-Day Forecast for Wanapum 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 | 58 | 76 | 70 | 1015 | 47 | 12 | 22 | W | 20 | 0 |  |
| Wed | 50 | 65 | 60 | 1011 | 46 | 25 | 32 | W | 0 | - |  |
| Thu | 42 | 60 | 54 | 1011 | 37 | 19 | 32 | W | 0 | - | |
| Fri | 37 | 62 | 52 | 1025 | 38 | 10 | 15 | S | 0 | - | |
| Sat | 44 | 56 | 50 | 1023 | 41 | 5 | 4 | WSW | 0 | - | |
| Sun | 52 | 66 | 62 | 1013 | 44 | 25 | 40 | WNW | 0 | - | |
| Mon | 45 | 63 | 56 | 1019 | 39 | 15 | 27 | W | 0 | - |  |
| Tue | 45 | 64 | 52 | 1020 | 38 | 7 | 7 | W | 0 | - | |
Wanapum Dam Frequently Asked Questions
Wanapum Dam is in Washington.
Wanapum Dam is in Kittitas County.
Wanapum Dam is 93 feet high.
Wanapum Dam is 8,639 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