Easterday Reservoir Reservoir Report
Last Updated: December 13, 2025
Easterday Reservoir, located in Malheur County, Oregon, is a private water resource primarily used for irrigation purposes.
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Summary
Completed in 1948, this earth dam structure stands at 16 feet tall and spans a length of 2350 feet, providing a storage capacity of 1243 acre-feet. The reservoir is situated along the Granite Creek, with a drainage area of 7.5 square miles and a maximum discharge of 350 cubic feet per second.
With a low hazard potential and a condition assessment of "Not Rated", Easterday Reservoir is regulated by the Oregon Water Resources Department, ensuring state permitting, inspection, and enforcement protocols are in place. The outlet gates are of the needle type, and the last inspection date was recorded in August 2011. While the emergency action plan status and risk assessment details are not specified in the data, the reservoir's location in a rural area underscores its importance in supporting agricultural activities in the region.
For water resource and climate enthusiasts, Easterday Reservoir offers a fascinating glimpse into the infrastructure that sustains agricultural operations in Oregon. Its historical significance as a vital water source for irrigation, coupled with its low hazard potential, showcases the balance between human development and environmental stewardship. As climate change continues to impact water availability, understanding and managing reservoirs like Easterday becomes increasingly crucial for ensuring sustainable water management practices in the face of evolving environmental challenges.
Year Completed |
1948 |
Dam Length |
2350 |
Dam Height |
14 |
River Or Stream |
GRANITE CREEK |
Primary Dam Type |
Earth |
Surface Area |
20 |
Hydraulic Height |
12 |
Drainage Area |
7.5 |
Nid Storage |
1243 |
Structural Height |
16 |
Outlet Gates |
Needle |
Hazard Potential |
Low |
Nid Height |
16 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
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.
Easterday Reservoir
Cottonwood Cr - M1
Canyon Cr - M9