Plat I Reservoir Report
Last Updated: December 13, 2025
Plat I is a vital flood risk reduction structure located in Sutherlin, Oregon, along the Sutherlin Creek.
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Summary
Built in 1967 by the Natural Resources Conservation Service, this earth dam stands at a height of 30 feet and spans a length of 1236 feet. With a maximum storage capacity of 2760 acre-feet and a normal storage capacity of 870 acre-feet, Plat I plays a crucial role in managing water levels and reducing flood risks in the region.
Managed by the local government and regulated by the Oregon Water Resources Department, Plat I has been deemed to have a high hazard potential but is currently in satisfactory condition. The dam's spillway type is uncontrolled, and it has a maximum discharge capacity of 770 cubic feet per second. With its primary purpose being flood risk reduction, Plat I also serves irrigation needs in the area. It is crucial for water resource and climate enthusiasts to monitor the condition and management of Plat I to ensure its continued effectiveness in protecting the surrounding communities.
Despite its moderate risk assessment level, Plat I remains a key infrastructure for water management in Douglas County, Oregon. With regular inspections and enforcement measures in place, this dam continues to safeguard the region from potential flooding events. Its location, design, and operational capacity make Plat I a valuable asset for water resource management and climate resilience efforts in the area, highlighting the importance of proactive monitoring and maintenance of critical water infrastructure.
Year Completed |
1967 |
Dam Length |
1236 |
Dam Height |
28 |
River Or Stream |
SUTHERLIN CREEK |
Primary Dam Type |
Earth |
Surface Area |
155 |
Hydraulic Height |
26 |
Drainage Area |
9 |
Nid Storage |
2760 |
Structural Height |
30 |
Hazard Potential |
High |
Nid Height |
30 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
North Umpqua River At Winchester
|
1480cfs |
Little River At Peel
|
2120cfs |
Little Wolf Creek Near Tyee
|
4cfs |
South Umpqua River Near Brockway
|
386cfs |
Umpqua River Near Elkton
|
2290cfs |
Coast Fork Willamette R Blw Cottage Grove Dam
|
81cfs |
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.
Area Campgrounds
| Location | Reservations | Toilets |
|---|---|---|
Whistlers Bend County Park
|
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Amacher County Park
|
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Amacher Park
|
Plat I
Douglas County