Jackman Coulee Dam 1 Reservoir Report
Last Updated: December 13, 2025
Jackman Coulee Dam 1, also known as Tom O'Leary #1, is located in Bismarck, North Dakota and was completed in 2003.
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Summary
This local government-owned dam on the Jackman Coulee River serves the primary purpose of flood risk reduction in the area. With a height of 22 feet and a length of 290 feet, the dam has a storage capacity of 57.1 acre-feet and a drainage area of 1.51 square miles.
The dam is classified as an earth dam with a stone core foundation, and it features an uncontrolled spillway that is 130 feet wide. Despite being rated as having a low hazard potential, the dam's risk assessment is considered moderate. The condition of the dam is currently not rated, and it has not been assessed for an Emergency Action Plan (EAP) or other risk management measures. The last inspection was conducted in October 2003, and it is regulated by the North Dakota State Water Commission (NDSWC).
Overall, Jackman Coulee Dam 1 plays a crucial role in mitigating flood risks in the surrounding area and is a key structure in the local water resource management system. Its strategic location and design contribute to the overall safety and well-being of the community, providing peace of mind for residents and authorities alike. As climate change continues to impact the frequency and intensity of extreme weather events, the importance of infrastructure like Jackman Coulee Dam 1 only grows, highlighting the need for ongoing monitoring and maintenance to ensure its effectiveness in the face of evolving environmental challenges.
Year Completed |
2003 |
Dam Length |
290 |
Dam Height |
22 |
River Or Stream |
JACKMAN COULEE |
Primary Dam Type |
Earth |
Drainage Area |
1.51 |
Nid Storage |
57.1 |
Structural Height |
22 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
22 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Missouri River At Bismarck
|
16700cfs |
Hay Creek At Main Avenue In Bismarck
|
3cfs |
Burnt Creek Nr Bismarck
|
9cfs |
Apple Creek Nr Menoken
|
59cfs |
Heart River Nr Mandan
|
101cfs |
Heart River At Stark Bridge Nr Judson
|
61cfs |
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.
Jackman Coulee Dam 1
River Road Bismarck