Jackman Coulee Dam 2 Reservoir Report
Last Updated: December 13, 2025
Jackman Coulee Dam 2, also known as Tom O'Leary #2, is a crucial structure located in Bismarck, North Dakota, designed by Michael Gunsch PE.
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Summary
Completed in 2003, this earth dam stands at a height of 23 feet and serves the primary purpose of flood risk reduction along the Jackman Coulee. With a storage capacity of 92.1 acre-feet and a surface area of 0.6 acres, this dam plays a significant role in managing water resources in the region.
Owned by the local government and regulated by the North Dakota State Water Commission, Jackman Coulee Dam 2 is inspected regularly to ensure its satisfactory condition and high hazard potential. With one valve outlet gate and an uncontrolled spillway width of 60 feet, this dam is equipped to handle flood events effectively. The risk assessment for this dam is moderate, highlighting the importance of ongoing risk management measures to safeguard the surrounding area from potential inundation.
For water resource and climate enthusiasts, Jackman Coulee Dam 2 represents a vital piece of infrastructure in the region, showcasing the intersection of engineering excellence and environmental stewardship. As a key player in flood risk reduction efforts, this earth dam stands as a testament to the proactive measures taken to protect communities and manage water resources effectively. In an era of increasing climate-related challenges, the importance of structures like Jackman Coulee Dam 2 cannot be overstated in ensuring the resilience and sustainability of our water systems.
Year Completed |
2003 |
Dam Height |
23 |
River Or Stream |
JACKMAN COULEE |
Primary Dam Type |
Earth |
Surface Area |
0.6 |
Drainage Area |
1.93 |
Nid Storage |
92.1 |
Structural Height |
23 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
High |
Foundations |
Soil |
Nid Height |
23 |
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 2
River Road Bismarck