Multnomanh Channel Dam #2 Reservoir Report
Nearby: Van Raden Schmidt, Howard Reservoir
Last Updated: December 13, 2025
Multnomanh Channel Dam #2, located in Multnomah County, Oregon, is a private dam regulated by the Oregon Water Resources Department.
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Summary
Standing at a height of 11.5 feet with a storage capacity of 240 acre-feet, this dam plays a crucial role in managing water resources in the area. Although its primary purpose and dam type are not specified, its low hazard potential and "Not Rated" condition assessment indicate that it is well-maintained and poses minimal risk to surrounding communities.
This dam, also known as Ducks Unlimited South Reservoir, is situated on a tributary of the Columbia River and falls under the jurisdiction of the Portland District of the US Army Corps of Engineers. While specific details about its construction and function remain unclear, its presence highlights the importance of private entities in water resource management. With inspection frequency set at 6 years and the last inspection conducted in December 2016, Multnomanh Channel Dam #2 demonstrates a commitment to ensuring its structural integrity and the safety of downstream areas.
As a pivotal structure in the region's water infrastructure, Multnomanh Channel Dam #2 serves as a reminder of the complex network of dams and reservoirs that contribute to water supply, flood control, and environmental conservation efforts. While further information regarding its design, purpose, and operation is needed to fully understand its role, its presence underscores the interconnectedness of water resources and the need for ongoing monitoring and maintenance to ensure the safety and sustainability of our water systems.
Dam Height |
11.5 |
River Or Stream |
TRIB/COLUMBIA RIVER |
Nid Storage |
240 |
Hazard Potential |
Low |
Nid Height |
12 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
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.
Multnomanh Channel Dam #2
Happy Rock Moorage Inc.