Hoefer-Pierson Reservoir Reservoir Report
Nearby: Pierson-Upper Dober Reservoir
Last Updated: December 13, 2025
Hoefer-Pierson Reservoir, located in Oregon, serves as a vital water resource for irrigation purposes in the region.
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Summary
Owned privately, this reservoir was completed in 1970 and has a storage capacity of 16 acre-feet, with a normal storage level of 15.8 acre-feet. Situated along Christensen Creek, the dam stands at a height of 23 feet and has a hydraulic height of 17 feet, providing essential water management for the surrounding area.
With a significant hazard potential, Hoefer-Pierson Reservoir is regulated and inspected by the Oregon Water Resources Department to ensure its structural integrity and operational efficiency. The reservoir features a needle outlet gate and has a maximum discharge capacity of 652 cubic feet per second. Despite not being rated for its condition, the reservoir plays a crucial role in supporting agricultural activities and water supply in the region, highlighting the importance of sustainable water resource management in the face of changing climate conditions.
As a key component of the irrigation infrastructure in Washington County, Oregon, Hoefer-Pierson Reservoir offers valuable insights into the challenges and opportunities associated with water resource management in the region. With its strategic location and essential role in providing water for agricultural activities, this reservoir serves as a critical lifeline for local communities and underscores the need for effective regulatory oversight and maintenance to ensure its long-term sustainability in the face of evolving climate conditions.
Year Completed |
1970 |
Dam Length |
376 |
Dam Height |
23 |
River Or Stream |
CHRISTENSEN CREEK |
Primary Dam Type |
Earth |
Surface Area |
2.6 |
Hydraulic Height |
17 |
Drainage Area |
1.28 |
Nid Storage |
16 |
Structural Height |
23 |
Outlet Gates |
Needle |
Hazard Potential |
Significant |
Nid Height |
23 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Tualatin River Near Dilley
|
1130cfs |
Willamette River At Newberg
|
52600cfs |
Fanno Creek At Durham
|
36cfs |
Fanno Creek At 56th Ave
|
3cfs |
East Fork Dairy Creek Near Meacham Corner
|
21cfs |
Tryon Creek Blw Nettle Creek
|
11cfs |
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.
Hoefer-Pierson Reservoir