Twigg Reservoir Reservoir Report
Last Updated: December 13, 2025
Twigg Reservoir, located in Oregon, is a private water resource managed by the state regulatory agency OWRD.
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Summary
Built in 1957 for irrigation purposes, this Earth-type dam stands at a height of 16 feet and has a maximum storage capacity of 65 acre-feet. Despite its small size, Twigg Reservoir plays a crucial role in supporting local agriculture and maintaining water resources in the region.
The reservoir, situated on an unnamed tributary of Christensen Creek, covers a surface area of 14.6 acres and is primarily used for irrigation. With a low hazard potential and a condition assessment that is currently not rated, Twigg Reservoir serves as a reliable water source for the surrounding community. Although it has not been inspected since November 2016, the reservoir continues to operate effectively, showcasing its importance in sustaining water supplies for agricultural needs.
Managed by private owners, Twigg Reservoir stands as a testament to the vital role that small-scale water resources play in supporting local economies and maintaining environmental sustainability. With a history of providing reliable irrigation water since its completion over six decades ago, this reservoir serves as a valuable asset in the management of water resources and climate resilience in the region.
Year Completed |
1957 |
Dam Length |
240 |
Dam Height |
16 |
River Or Stream |
UNNAMED TRIB/CHRISTENSEN CREEK |
Primary Dam Type |
Earth |
Surface Area |
14.6 |
Hydraulic Height |
11 |
Nid Storage |
65 |
Hazard Potential |
Low |
Nid Height |
16 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Tualatin River Near Dilley
|
1360cfs |
Willamette River At Newberg
|
64600cfs |
Fanno Creek At Durham
|
49cfs |
Fanno Creek At 56th Ave
|
4cfs |
Tryon Creek Blw Nettle Creek
|
15cfs |
Tualatin River At West Linn
|
4340cfs |
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.
Twigg Reservoir