Mallories Lagoon #1 Reservoir Report
Last Updated: December 13, 2025
Mallories Lagoon #1 in Marion, Oregon is a privately owned irrigation reservoir regulated by the Oregon Water Resources Department.
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Summary
The lagoon, with a dam height of 13 feet and a storage capacity of 92 acre-feet, serves as a crucial water source for agricultural purposes in the area. Despite its low hazard potential, the condition of the dam has not been officially rated, and the last inspection was conducted in May 2020 with a frequency of every 6 years.
Located in the Portland District, Mallories Lagoon #1 features a slide (sluice gate) outlet gate for water release. While the dam serves primarily for irrigation, it is also classified as an earth dam with no associated locks or spillways. The surrounding area lacks inundation maps, emergency action plans, and updated contact information, raising concerns about preparedness in case of unforeseen events. Enthusiasts of water resources and climate resilience should keep an eye on Mallories Lagoon #1 for potential developments in risk assessment and management measures in the future.
Dam Height |
13 |
Primary Dam Type |
Earth |
Nid Storage |
92 |
Outlet Gates |
Slide (sluice gate) |
Hazard Potential |
Low |
Nid Height |
13 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Silver Creek At Silverton
|
52cfs |
Abiqua Creek At Silverton
|
74cfs |
Zollner Creek Near Mt Angel
|
320cfs |
Butte Creek At Monitor
|
453cfs |
Pudding River Near Woodburn
|
4380cfs |
Willamette River At Salem
|
35800cfs |
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.
Mallories Lagoon #1
Silver Creek Reservoir