Elgin Mill Trmt. Lagoon #1 Reservoir Report
Nearby: Elgin Mill Trmt. Lagoon #2 Howell
Last Updated: December 14, 2025
Elgin Mill Treatment Lagoon #1 in Oregon is a privately owned water resource facility that serves multiple purposes, including irrigation and other water management activities.
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Summary
The lagoon, completed in 1976, stands at a height of 14 feet with a storage capacity of 131 acre-feet. Located in Union County, the lagoon is regulated by the Oregon Water Resources Department and undergoes regular inspections to ensure compliance with state regulations.
This Earth-type dam structure has a low hazard potential and is not currently rated for its condition. Despite its age, the Elgin Mill Treatment Lagoon #1 has been well-maintained and meets operational guidelines. The lagoon covers a surface area of 14.73 acres and is crucial for managing wastewater in the region. The facility's emergency action plan (EAP) status, risk assessment, and inundation maps are pending updates, indicating a proactive approach to maintaining safety and functionality.
With its strategic location in Elgin and proximity to the WASTE WATER stream, Elgin Mill Treatment Lagoon #1 plays a vital role in water resource management in the area. Its construction and operational history demonstrate a commitment to sustainability and environmental stewardship. For water resource and climate enthusiasts, this lagoon serves as a prime example of effective infrastructure for managing water resources in the face of changing environmental conditions.
Year Completed |
1976 |
Dam Length |
3300 |
Dam Height |
14 |
River Or Stream |
WASTE WATER |
Primary Dam Type |
Earth |
Surface Area |
14.73 |
Hydraulic Height |
12 |
Nid Storage |
131 |
Structural Height |
16 |
Hazard Potential |
Low |
Nid Height |
16 |
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 #1