Amoco Dam 1 Reservoir Report

Last Updated: December 13, 2025

Amoco Dam 1, located in Morton County, North Dakota, was completed in 1973 by the Amoco Oil Company.


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Summary

This private dam stands at a height of 24 feet and has a storage capacity of 110 acre-feet. It is primarily used for purposes other than flood control or water supply, with an uncontrolled spillway width of 75 feet.

The dam's condition assessment is currently marked as "Not Rated," with an undetermined hazard potential and moderate risk level. The North Dakota State Water Commission regulates and inspects the dam, ensuring that it meets state permitting and enforcement standards. While no associated structures or locks are present, the dam's location on the Missouri River-TR provides vital water resource management for the surrounding area.

For water resource and climate enthusiasts, Amoco Dam 1 serves as a noteworthy example of private dam infrastructure in North Dakota. Its design by the Amoco Oil Company and state regulation by NDSWC highlight the importance of sustainable water management practices in the region. With a focus on risk management and regulatory compliance, this dam plays a crucial role in maintaining water quality and availability for the local community and ecosystem.

Year Completed

1973

Dam Height

24

River Or Stream

MISSOURI RIVER-TR

Primary Dam Type

Earth

Surface Area

14

Drainage Area

2

Nid Storage

110

Outlet Gates

None

Hazard Potential

Undetermined

Foundations

Soil

Nid Height

24
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.