Roy Farm Reservoir Report
Nearby: Vandehey Reservoir Lind Reservoir
Last Updated: December 13, 2025
Roy Farm, located in Cornelius, Oregon, is a privately owned water resource structure regulated by the Oregon Water Resources Department.
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Summary
Completed in 1989, this earth dam stands at 14 feet tall and spans 400 feet in length, with a storage capacity of 100 acre-feet and a maximum discharge of 193 cubic feet per second. The dam, situated on the East Fork Dairy Creek, serves a primary purpose of "Other," supporting various agricultural activities on the farm.
Despite its low hazard potential and moderate risk assessment, Roy Farm has not been rated for its condition assessment. The dam features a slide (sluice gate) outlet gate and an uncontrolled spillway type. With a drainage area of 0.42 square miles and a surface area of 11.2 acres, the structure plays a crucial role in managing water resources in the region. The last inspection of Roy Farm took place in December 2017, with a scheduled inspection frequency of every 6 years.
Roy Farm's presence in Washington County, Oregon, highlights the importance of sustainable water resource management in the face of changing climate patterns. As climate enthusiasts, monitoring and ensuring the structural integrity of such vital water resource facilities is key to safeguarding against potential risks and ensuring the continued resilience of our water infrastructure in the region.
Year Completed |
1989 |
Dam Length |
400 |
Dam Height |
14 |
River Or Stream |
EAST FORK DAIRY CREEK, TRIB TO |
Primary Dam Type |
Earth |
Surface Area |
11.2 |
Hydraulic Height |
10 |
Drainage Area |
0.42 |
Nid Storage |
100 |
Structural Height |
14 |
Outlet Gates |
Slide (sluice gate) |
Hazard Potential |
Low |
Nid Height |
14 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
East Fork Dairy Creek Near Meacham Corner
|
21cfs |
Tualatin River Near Dilley
|
1130cfs |
Columbia Slough At Portland
|
5cfs |
Fanno Creek At 56th Ave
|
3cfs |
Fanno Creek At Durham
|
36cfs |
Nehalem River Near Vernonia
|
464cfs |
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.
Roy Farm