Elgin Mill Trmt. Lagoon #2 Reservoir Report
Nearby: Elgin Mill Trmt. Lagoon #1 Howell
Last Updated: December 14, 2025
Elgin Mill Treatment Lagoon #2 is a private water resource facility located in Union, Oregon.
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Summary
This Earth-type dam was completed in 2017 and stands at a height of 36 feet, providing a storage capacity of 82 acre-feet. The lagoon is regulated and inspected by the Oregon Water Resources Department, ensuring compliance with state regulations for water management.
With its significant hazard potential, Elgin Mill Treatment Lagoon #2 is subject to regular inspections every three years to assess its condition and safety. The last inspection in September 2018 found the dam to be in satisfactory condition, although its overall assessment is currently unrated. Emergency action plans and risk assessment measures are yet to be fully implemented, highlighting the importance of ongoing monitoring and management of this vital water resource infrastructure in the region.
The lagoon, designed by JUB, plays a crucial role in maintaining water quality and storage for the community of Elgin. Situated within the Walla Walla District, it serves as a key element of the local water management system. Climate enthusiasts and water resource experts alike can appreciate the significance of Elgin Mill Treatment Lagoon #2 in ensuring sustainable water supply and environmental protection in the area.
Year Completed |
2017 |
Dam Height |
36 |
Primary Dam Type |
Earth |
Nid Storage |
82 |
Hazard Potential |
Significant |
Nid Height |
36 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Minam River Near Minam
|
340cfs |
Umatilla River Above Meacham Creek
|
266cfs |
Meacham Creek At Gibbon
|
444cfs |
Mill Creek Near Walla Walla
|
102cfs |
Grande Ronde River At Troy
|
3000cfs |
Mill Creek At Five Mile Rd Br Nr Walla Walla
|
634cfs |
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.
Elgin Mill Trmt. Lagoon #2