Amoco Dam 9 Reservoir Report
Nearby: Amoco Dam Amoco Dam 1
Last Updated: December 13, 2025
Amoco Dam 9, located on the Missouri River in North Dakota, was completed in 1978 by the AMOCO OIL COMPANY.
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Summary
This private dam stands at a height of 22 feet and has a storage capacity of 64 acre-feet, serving a primary purpose of "Other." The dam is regulated by the North Dakota State Water Commission and has state permitting, inspection, and enforcement processes in place.
With a spillway width of 75 feet and a surface area of 8 acres, Amoco Dam 9 is classified as an Earth dam with a stone core and soil foundation. Despite being rated as "Not Rated" in terms of condition assessment, the dam has a moderate risk level (3) and an undetermined hazard potential. Although no associated structures or locks are present, the dam is equipped with uncontrolled spillways for managing water flow.
For water resource and climate enthusiasts, Amoco Dam 9 offers a fascinating case study in dam construction and regulation. Its location on the Missouri River, the primary source of water for numerous communities and ecosystems, highlights the importance of maintaining and monitoring infrastructure to ensure efficient water management and mitigate potential risks. As climate change continues to impact water resources, understanding the design, purpose, and regulatory framework of dams like Amoco Dam 9 becomes essential for sustainable water resource management in the future.
Year Completed |
1978 |
Dam Height |
22 |
River Or Stream |
MISSOURI RIVER-TR |
Primary Dam Type |
Earth |
Surface Area |
8 |
Drainage Area |
2 |
Nid Storage |
64 |
Hazard Potential |
Undetermined |
Foundations |
Soil |
Nid Height |
22 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Heart River Nr Mandan
|
101cfs |
Missouri River At Bismarck
|
16700cfs |
Burnt Creek Nr Bismarck
|
9cfs |
Hay Creek At Main Avenue In Bismarck
|
3cfs |
Apple Creek Nr Menoken
|
59cfs |
Sweetbriar Creek Nr Judson
|
3cfs |
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.
Amoco Dam 9
River Road Bismarck