Summary
The dam, standing at a hydraulic height of 14 feet and a structural height of 12 feet, is classified as an Earth dam with a core made of stone and a foundation of soil. It has a normal storage capacity of 50 acre-feet and a maximum storage capacity of 70 acre-feet, serving as an offstream structure on the Tucannon River.
Despite being rated as having a low hazard potential and not being inspected since 1998, Rainbow Lake Dam is regulated by the Washington Department of Ecology and is subject to state permitting, inspection, and enforcement. The dam has not been assessed for its condition or emergency action plan preparedness, indicating potential gaps in risk management measures. With its scenic surroundings and recreational opportunities, Rainbow Lake Dam remains a significant water resource for the local community and a point of interest for water resource and climate enthusiasts.
Year Completed |
1955 |
Dam Length |
1700 |
River Or Stream |
Tucannon River-Offstream |
Primary Dam Type |
Earth |
Surface Area |
10 |
Hydraulic Height |
14 |
Drainage Area |
0.2 |
Nid Storage |
70 |
Structural Height |
12 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
14 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo 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
HighDams 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.
Area Campgrounds
| Location | Reservations | Toilets |
|---|---|---|
Tucannon Guard Station
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Tucannon Campground
|
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Boundary Campground
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Forest Boundary Campground
|
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Tucannon
|
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Alder Thicket Campground
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Rainbow Lake Dam