Calderwood Reservoir Reservoir Report
Nearby: Mud Lake Greaser Lake Reservoir
Last Updated: December 13, 2025
Calderwood Reservoir, located in Plush, Oregon, is a privately owned water resource that serves primarily for irrigation purposes.
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Summary
Built in 1908, this Earth dam stands at a height of 12 feet and has a storage capacity of 1,477 acre-feet. With a surface area of 97.4 acres and a drainage area of 8.3 square miles, the reservoir plays a crucial role in the management of water resources in the region.
Managed by the Oregon Water Resources Department, Calderwood Reservoir is regulated, permitted, inspected, and enforced to ensure its safe operation. Despite its low hazard potential, the dam is not currently rated for its condition. The reservoir's location on Fish Creek, with a maximum discharge capacity of 120 cubic feet per second, highlights its importance in supporting local agriculture and water supply needs in the area. Additionally, the reservoir provides vital habitat for local wildlife and contributes to the overall ecological balance in the region.
While Calderwood Reservoir may not be a well-known landmark, its significance in water resource management and climate adaptation efforts cannot be understated. With its historical presence dating back over a century, this reservoir continues to be a vital component of the region's water infrastructure, supporting both human livelihoods and environmental sustainability. As climate change presents new challenges, the careful management and maintenance of Calderwood Reservoir will be crucial in ensuring the resilience and adaptability of the local water supply system.
Year Completed |
1908 |
Dam Length |
260 |
Dam Height |
12 |
River Or Stream |
FISH CREEK |
Primary Dam Type |
Earth |
Surface Area |
97.4 |
Hydraulic Height |
10 |
Drainage Area |
8.3 |
Nid Storage |
1477 |
Structural Height |
15 |
Hazard Potential |
Low |
Nid Height |
15 |
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.
Calderwood Reservoir