Osborne Creek Reservoir Report
Nearby: Woodrat Knob Owen
Last Updated: December 19, 2025
Osborne Creek, also known as Cascade Ranch #, is a private water resource located in Jackson County, Oregon.
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Summary
This earth dam, completed in 1964, serves primarily for irrigation purposes and stands at a height of 60 feet with a hydraulic height of 56 feet. The dam has a storage capacity of 775 acre-feet and covers a surface area of 35.4 acres, drawing water from a drainage area of 3.25 square miles.
Despite its essential role in providing water for agriculture, Osborne Creek's dam is rated as having a high hazard potential with a poor condition assessment. The last inspection in July 2021 highlighted its need for maintenance and repairs. The outlet gates consist of a slide (sluice gate) design, and the dam is regulated by the Oregon Water Resources Department, with permitting, inspection, and enforcement processes in place to ensure its safety and compliance with regulations.
Located in Brownsboro, Oregon, Osborne Creek's dam serves as a critical infrastructure for water management in the region. As climate change continues to impact water resources, the maintenance and improvement of structures like Osborne Creek are crucial for sustainable water use and resilience to changing environmental conditions. Efforts to address the dam's maintenance needs and mitigate potential risks are essential to safeguarding this important water resource for the community and the environment.
Year Completed |
1964 |
Dam Length |
730 |
Dam Height |
60 |
River Or Stream |
Osborne Creek |
Primary Dam Type |
Earth |
Surface Area |
35.4 |
Hydraulic Height |
56 |
Drainage Area |
3.25 |
Nid Storage |
775 |
Structural Height |
65 |
Outlet Gates |
Slide (sluice gate) |
Hazard Potential |
High |
Nid Height |
65 |
Seasonal Comparison
Weather Forecast
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.
Osborne Creek
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