Elmer Reservoir 3 (Union) Reservoir Report
Last Updated: December 14, 2025
Elmer Reservoir 3 in Union, Oregon is a privately owned irrigation reservoir situated along the Grande Ronde River.
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Summary
Completed in 1977, this earth dam structure stands at 14 feet high and spans a length of 1200 feet, with a storage capacity of 400 acre-feet. The reservoir serves primarily for irrigation purposes, helping to support agricultural activities in the region.
Despite its low hazard potential and not currently rated condition assessment, Elmer Reservoir 3 is subject to state regulation and inspection, ensuring its safe operation and maintenance. The reservoir features a slide gate outlet system and has a drainage area of 0.3 square miles. With a normal storage capacity of 58 acre-feet and a surface area of 36 acres, the reservoir plays a crucial role in supporting water resource management in the area.
Located in Imbler, Union County, this reservoir is a key component of the local water infrastructure, contributing to the sustainable use of water resources for irrigation purposes. As a significant water management structure in the region, Elmer Reservoir 3 showcases the importance of responsible water resource management in the face of changing climate conditions.
Year Completed |
1977 |
Dam Length |
1200 |
Dam Height |
14 |
River Or Stream |
GRANDE RONDE RIVER |
Primary Dam Type |
Earth |
Surface Area |
36 |
Hydraulic Height |
10 |
Drainage Area |
0.3 |
Nid Storage |
400 |
Structural Height |
14 |
Outlet Gates |
Slide (sluice gate) |
Hazard Potential |
Low |
Nid Height |
14 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Minam River Near Minam
|
298cfs |
Meacham Creek At Gibbon
|
315cfs |
Umatilla River Above Meacham Creek
|
196cfs |
Grande Ronde River At Troy
|
2460cfs |
Mill Creek Near Walla Walla
|
71cfs |
Umatilla R At W Reservation Bndy Nr Pendleton
|
434cfs |
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.
Elmer Reservoir 3 (Union)