Pacific Plywood Log Pond Reservoir Report
Last Updated: December 13, 2025
Located in Willamina, Oregon, the Pacific Plywood Log Pond, also known as the Willamina Sewage Lagoon, is a significant water resource managed by the local government.
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Summary
This earth dam structure, completed in 1944, stands at a height of 15 feet with a storage capacity of 132 acre-feet. Situated along the Willamina River, this pond serves various purposes and is regulated by the Oregon Water Resources Department.
With a low hazard potential and a condition assessment of "Not Rated," the Pacific Plywood Log Pond is integral to the local water management infrastructure. Equipped with a slide (sluice gate) outlet gate, this dam has a structural height of 15 feet and a hydraulic height of 10 feet. Despite its age, the dam remains a crucial component for flood control and water storage in the region, demonstrating its importance in maintaining water resources in Yamhill County, Oregon.
Although last inspected in 2016, the Pacific Plywood Log Pond is subject to regular inspections every 6 years to ensure its structural integrity and functionality. With no documented risk assessment or emergency action plan in place, there is a need for continued monitoring and management of this dam to mitigate any potential risks or issues that may arise in the future. Water resource and climate enthusiasts should take note of this site as it plays a crucial role in the local water management system and environmental conservation efforts.
Year Completed |
1944 |
Dam Length |
5019 |
Dam Height |
15 |
River Or Stream |
WILLAMINA RIVER |
Primary Dam Type |
Earth |
Surface Area |
12.1 |
Hydraulic Height |
10 |
Nid Storage |
132 |
Structural Height |
15 |
Outlet Gates |
Slide (sluice gate) |
Hazard Potential |
Low |
Nid Height |
15 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
South Yamhill River At Mcminnville
|
8310cfs |
Tucca Creek Near Blaine
|
123cfs |
Nestucca River Near Beaver
|
4610cfs |
Willamette River At Salem
|
35800cfs |
Luckiamute River Near Suver
|
3790cfs |
Trask River Above Cedar Creek
|
4300cfs |
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.
Pacific Plywood Log Pond
South Yamhill River