Glen Ullin Rr Dam 2 Reservoir Report
Last Updated: December 8, 2025
Glen Ullin Rr Dam 2, also known as North Reservoir, is a state-owned earth dam located in Morton County, North Dakota.
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Summary
Built in 1943 by NDSWC & NPRR, this dam serves primarily for recreational purposes along the Big Muddy Creek. With a height of 13.3 feet and a length of 3520 feet, it provides a storage capacity of 143.1 acre-feet, with a normal storage of 47.7 acre-feet.
The dam's spillway type is uncontrolled, with a width of 40 feet, and it features one slide (sluice gate) outlet gate. Despite being considered as having a significant hazard potential, the dam's condition assessment is currently not rated. It underwent structural modifications in 1991 and is regulated, inspected, and enforced by the NDSWC, ensuring its safety and functionality. The risk assessment for the dam is moderate (3), reflecting the efforts in place to manage and mitigate potential risks.
For water resource and climate enthusiasts, Glen Ullin Rr Dam 2 presents a fascinating case study of a historic earth dam that continues to play a vital role in the local community's recreational activities. With its scenic location and important water storage capacity, this dam stands as a testament to the ongoing efforts to manage and safeguard our valuable water resources. Its design, construction, and maintenance serve as important factors in ensuring the safety and sustainability of this essential infrastructure for years to come.
Years Modified |
1991 - Structural |
Year Completed |
1943 |
Dam Length |
3520 |
Dam Height |
13.3 |
River Or Stream |
BIG MUDDY CREEK |
Primary Dam Type |
Earth |
Surface Area |
12.5 |
Drainage Area |
2 |
Nid Storage |
143.1 |
Outlet Gates |
Slide (sluice gate) - 1 |
Hazard Potential |
Significant |
Foundations |
Soil |
Nid Height |
13 |
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.
Glen Ullin Rr Dam 2