Deraeve Reservoir #2 Reservoir Report
Last Updated: December 13, 2025
Deraeve Reservoir #2, also known as Deraeve Upper Dam, is a privately owned irrigation reservoir located in McCoy, Oregon.
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Summary
Built in 1987 by designer BOATWRIGHT, this earth-type dam stands at a height of 22 feet and has a hydraulic height of 17 feet. The reservoir has a storage capacity of 103 acre-feet, with a normal storage level of 66 acre-feet and a surface area of 13.5 acres.
Situated on the Ash Swale tributary, Deraeve Reservoir #2 serves the primary purpose of irrigation in the region. With a low hazard potential and a condition assessment of "Not Rated," this dam is regulated by the Oregon Water Resources Department and undergoes regular inspections. The outlet gates for this reservoir are of the slide (sluice gate) type, and the last inspection was conducted in May 2017 with an inspection frequency of 6 years.
Overall, Deraeve Reservoir #2 plays a crucial role in supporting agricultural activities in the area while maintaining a low hazard potential. As a part of the water resource infrastructure in Polk County, Oregon, this dam exemplifies the importance of sustainable water management practices in the face of changing climate conditions. With its strategic location and design features, Deraeve Reservoir #2 stands as a testament to the intersection of water resource management and climate resilience in the region.
Year Completed |
1987 |
Dam Length |
250 |
Dam Height |
22 |
River Or Stream |
ASH SWALE, TRIB TO |
Primary Dam Type |
Earth |
Surface Area |
13.5 |
Hydraulic Height |
17 |
Drainage Area |
0.89 |
Nid Storage |
103 |
Outlet Gates |
Slide (sluice gate) |
Hazard Potential |
Low |
Nid Height |
22 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
South Yamhill River At Mcminnville
|
8310cfs |
Willamette River At Salem
|
35800cfs |
Luckiamute River Near Suver
|
3790cfs |
Zollner Creek Near Mt Angel
|
320cfs |
Willamette River At Newberg
|
52600cfs |
Abiqua Creek At Silverton
|
74cfs |
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.
Deraeve Reservoir #2
Mission Lake