Weaver Reservoir Reservoir Report
Nearby: Yoncalla Reservoir Bear Creek 3
Last Updated: December 13, 2025
Located in Yoncalla, Oregon, Weaver Reservoir, also known as Thurman-Weaver, is a privately owned water resource managed for irrigation purposes.
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Summary
Built in 1970, this earth dam structure stands at a height of 22 feet and has a storage capacity of 55 acre-feet, serving as a vital source of water for agricultural activities in the region. With a surface area of 9.95 acres and a maximum discharge capacity of 450 cubic feet per second, Weaver Reservoir plays a crucial role in sustaining the local ecosystem.
Managed by the Natural Resources Conservation Service, Weaver Reservoir is regulated by the Oregon Water Resources Department, ensuring state oversight and enforcement of safety standards. The dam's low hazard potential and not rated condition assessment indicate its stable operational status, providing a reliable water supply for the surrounding area. Despite its modest size, Weaver Reservoir's strategic location along Yoncalla Creek contributes to the overall water management infrastructure in Oregon, highlighting the importance of sustainable resource utilization in mitigating the impacts of climate change on water availability.
As a part of the larger water management system in Douglas County, Oregon, Weaver Reservoir serves as a testament to the collaborative efforts between private owners, state agencies, and federal partners in safeguarding water resources for irrigation and other essential purposes. With its consistent inspection schedule and adherence to regulatory guidelines, Weaver Reservoir stands as a model for responsible water resource management, showcasing the intersection of environmental stewardship, climate resilience, and agricultural sustainability in the Pacific Northwest.
Year Completed |
1970 |
Dam Length |
500 |
Dam Height |
22 |
River Or Stream |
YONCALLA CREEK (OFFSTREAM) |
Primary Dam Type |
Earth |
Surface Area |
9.95 |
Hydraulic Height |
20 |
Drainage Area |
0.44 |
Nid Storage |
55 |
Structural Height |
22 |
Hazard Potential |
Low |
Nid Height |
22 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Umpqua River Near Elkton
|
2290cfs |
Little Wolf Creek Near Tyee
|
4cfs |
Coast Fork Willamette R Blw Cottage Grove Dam
|
81cfs |
North Umpqua River At Winchester
|
1480cfs |
Row River Near Cottage Grove
|
183cfs |
Little River At Peel
|
2120cfs |
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 |
|---|---|---|
Tyee Recreation Site
|
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Tyee - Sutherlin
|
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Eagleview Group Site
|
Weaver Reservoir