Alfred Lewis Reservoir Report
Last Updated: December 14, 2025
Alfred Lewis is a private irrigation dam located in Cornelius, Oregon, along Dairy Creek.
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Summary
Managed by the USDA NRCS, this earth dam stands at 20 feet in height and 755 feet in length, providing a storage capacity of 100 acre-feet for agricultural purposes. With a low hazard potential, the dam has a spillway width of 16 feet and a maximum discharge rate of 131 cubic feet per second.
While the dam's condition assessment is not available, it is regularly monitored for safety. Despite its small drainage area of 0.29 square miles, Alfred Lewis plays a crucial role in supporting water resource management in the region. With its strategic location and purpose, this dam serves as a vital component of the local irrigation infrastructure, ensuring a reliable water supply for agricultural activities in Marion County, Oregon. For water resource and climate enthusiasts, Alfred Lewis represents a fascinating blend of engineering ingenuity and environmental stewardship in maintaining a sustainable water supply system in the region.
Dam Length |
755 |
Dam Height |
20 |
River Or Stream |
Dairy Creek |
Primary Dam Type |
Earth |
Drainage Area |
0.29 |
Nid Storage |
100 |
Hazard Potential |
Low |
Nid Height |
20 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Willamette River At Salem
|
28400cfs |
Silver Creek At Silverton
|
52cfs |
Abiqua Creek At Silverton
|
74cfs |
Zollner Creek Near Mt Angel
|
320cfs |
Pudding River Near Woodburn
|
3250cfs |
Butte Creek At Monitor
|
327cfs |
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.
Alfred Lewis
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