Marvin Fast Dam Reservoir Report
Last Updated: December 13, 2025
Marvin Fast Dam is a private dam located in Amity, Oregon, along the Ash Swale river.
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Summary
Built in 1979, the dam stands at 16 feet tall and stretches 700 feet in length, with a storage capacity of 440 acre-feet for irrigation purposes. Managed by the USDA NRCS, this dam plays a vital role in providing water resources for agricultural activities in the region.
Despite its low hazard potential, the condition assessment of Marvin Fast Dam is currently marked as "Not Available", indicating a need for further evaluation and monitoring. The dam's emergency action plan status, risk assessment, and inundation maps preparedness are also listed as unavailable. With a maximum discharge capacity of 2037 cubic feet per second, ensuring the safety and maintenance of this crucial water resource infrastructure is paramount for the surrounding community.
As a significant component of the local water management system, Marvin Fast Dam serves as a key player in supporting irrigation activities in the area. Its strategic location and storage capacity make it a valuable asset for sustaining agricultural production and managing water resources effectively. However, ongoing assessments and improvements are necessary to safeguard the dam's structural integrity and emergency response preparedness for the long-term benefit of the region's water supply and climate resilience.
Year Completed |
1979 |
Dam Length |
700 |
Dam Height |
16 |
River Or Stream |
Ash Swale |
Primary Dam Type |
Other |
Drainage Area |
25.2 |
Nid Storage |
440 |
Hazard Potential |
Low |
Nid Height |
16 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
South Yamhill River At Mcminnville
|
11800cfs |
Willamette River At Salem
|
43700cfs |
Luckiamute River Near Suver
|
5830cfs |
Zollner Creek Near Mt Angel
|
320cfs |
Willamette River At Newberg
|
64600cfs |
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.
Marvin Fast Dam
Mission Lake