Obach Dam; Mike 2 Reservoir Report
Last Updated: December 6, 2025
Obach Dam; Mike 2 is a privately owned structure located in Stark, North Dakota, along the Heart River.
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Summary
Built in 2012 by the USFWS, this earth dam stands at a height of 12.8 feet with a structural height of 15.8 feet and a length of 410 feet. The dam serves multiple purposes including fire protection, stock, and as a small fish pond, providing a storage capacity of 110.4 acre-feet with a normal storage capacity of 27.6 acre-feet.
With a low hazard potential and a moderate risk assessment, Obach Dam; Mike 2 is regulated by the NDSWC and is subject to state permitting, inspection, and enforcement. The dam features an uncontrolled spillway with a width of 80 feet and has a surface area of 12 acres, serving a drainage area of 0.39 square miles. Despite its moderate risk assessment, the dam has not been rated for its condition assessment, and emergency preparedness measures such as an EAP and inundation maps are not currently in place.
Overall, Obach Dam; Mike 2 plays a crucial role in the local water resource management system, providing essential services for fire protection, stock, and fish pond purposes. Its construction and design by the USFWS ensure its functionality and efficiency in serving the community while adhering to state regulations and enforcement measures to mitigate potential risks and ensure public safety.
Year Completed |
2012 |
Dam Length |
410 |
Dam Height |
12.8 |
River Or Stream |
HEART RIVER-TR |
Primary Dam Type |
Earth |
Surface Area |
12 |
Drainage Area |
0.39 |
Nid Storage |
110.4 |
Structural Height |
15.8 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
16 |
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.
Obach Dam; Mike 2