Port Of Morrow Wwt Lagoon Reservoir Report
Last Updated: December 14, 2025
The Port of Morrow Wastewater Treatment Lagoon in Morrow County, Oregon, is a vital resource for local irrigation purposes.
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Summary
Completed in 1994, this Earth dam structure stands at a height of 20 feet and has a storage capacity of 436 acre-feet. Situated off-channel and managed by the local government, the lagoon covers a surface area of 39 acres and serves as a key component in the region's water management infrastructure.
Despite its low hazard potential and a history of not being rated for condition assessment, the Port of Morrow Wwt Lagoon remains a crucial asset for ensuring water availability in the area. With state permitting, inspection, and enforcement in place, the lagoon meets regulatory standards and plays a significant role in sustaining agricultural activities in the region. The facility is situated in an isolated location with no downstream settlement, highlighting its importance for local water resource management.
Owned and regulated by the local government with state oversight from the Oregon Water Resources Department, the Port of Morrow Wastewater Treatment Lagoon exemplifies the collaborative efforts in maintaining water resources in the region. With a focus on irrigation, this facility continues to support agricultural activities while adhering to state regulations and ensuring water availability for the community.
Year Completed |
1994 |
Dam Height |
20 |
River Or Stream |
OFF CHANNEL |
Primary Dam Type |
Earth |
Surface Area |
39 |
Drainage Area |
0.14 |
Nid Storage |
436 |
Outlet Gates |
Slide (sluice gate) |
Hazard Potential |
Low |
Nid Height |
20 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Umatilla River Near Umatilla
|
516cfs |
Yakima River At Kiona
|
23800cfs |
Yakima River At Mabton
|
28900cfs |
Willow Creek At Morgan Street
|
2cfs |
Willow Creek At Heppner
|
0cfs |
Willow Creek Abv Willow Cr Lake
|
6cfs |
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.
Port Of Morrow Wwt Lagoon