Thompson Valley Reservoir Reservoir Report
Last Updated: December 13, 2025
Thompson Valley Reservoir, located in Silver Lake, Oregon, is a significant water resource managed by the local government for irrigation purposes.
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Summary
Built in 1922, this Earth dam stands at a height of 48 feet and has a storage capacity of 30,500 acre-feet, providing water for a drainage area of 150 square miles. With a normal storage capacity of 21,040 acre-feet, the reservoir covers a surface area of 1,900 acres and has a maximum discharge rate of 2,514 cubic feet per second.
This reservoir on Silver Creek is regulated by the Oregon Water Resources Department and undergoes regular inspections to ensure its structural integrity and safety. Classified as having a "significant" hazard potential, Thompson Valley Reservoir has not been rated for its condition assessment as of yet. The emergency action plan status and risk management measures for this dam are currently not specified, highlighting the importance of continued monitoring and maintenance to mitigate any potential risks associated with its operation.
For water resource and climate enthusiasts, Thompson Valley Reservoir offers a fascinating example of early 20th-century engineering for irrigation purposes in Oregon. Its historical significance, combined with its vital role in providing water for agricultural activities in the region, underscores the importance of sustainable water management practices in the face of changing climatic conditions. As a key component of the local water infrastructure, this reservoir serves as a reminder of the intricate relationship between human development and natural resources, urging us to prioritize conservation efforts for the future.
Year Completed |
1922 |
Dam Length |
290 |
Dam Height |
48 |
River Or Stream |
SILVER CREEK |
Primary Dam Type |
Earth |
Surface Area |
1900 |
Hydraulic Height |
45 |
Drainage Area |
150 |
Nid Storage |
30500 |
Structural Height |
48 |
Hazard Potential |
Significant |
Nid Height |
48 |
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 |
|---|---|---|
Thompson Reservoir
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East Bay
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Silver Creek Marsh
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Upper Buck Creek
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Lower Buck Creek
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Thompson Valley Reservoir