Lemmon Ranch Dam Reservoir Report
Last Updated: December 6, 2025
Located in North Dakota, Lemmon Ranch Dam, also known as Hagens Dam, is a privately owned structure designed by the WPA and completed in 1938.
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Summary
Situated on the Russian Slough Creek, this earth dam has a height of 10 feet and a length of 625 feet, providing storage capacity of 200 acre-feet for recreational purposes. The dam is regulated by the NDSWC and is inspected, permitted, and enforced by the state, ensuring its safety and compliance with regulations.
With a spillway width of 40 feet and uncontrolled spillway type, Lemmon Ranch Dam has a significant hazard potential and a moderate risk assessment rating. Despite its condition not being rated, the dam's emergency action plan status, inundation maps, and risk management measures are currently unclear. The dam's location in Adams County, North Dakota, adds to its appeal for water resource and climate enthusiasts interested in exploring the historical and environmental significance of this structure, which stands as a testament to New Deal-era infrastructure projects and the importance of water management in the region.
Year Completed |
1938 |
Dam Length |
625 |
Dam Height |
10 |
River Or Stream |
RUSSIAN SLOUGH CREEK |
Primary Dam Type |
Earth |
Nid Storage |
200 |
Structural Height |
12 |
Outlet Gates |
None |
Hazard Potential |
Significant |
Foundations |
Soil |
Nid Height |
12 |
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.
Lemmon Ranch Dam