Earsley Dam; Allan 1 Reservoir Report
Nearby: Lemmon Ranch Dam Rustan Dam; Lewellyn
Last Updated: December 6, 2025
Earsley Dam; Allan 1, also known as Wetland No.
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Summary
1, is a private earth dam located in North Dakota, specifically in Adams County. Built in 2005 by the USFWS, this dam serves multiple purposes including fire protection, stock, and small fish pond. With a height of 19.1 feet and a storage capacity of 351.4 acre-feet, Earsley Dam plays a crucial role in the local water resource management, especially in the Russian Slough Creek watershed.
Being regulated by the NDSWC and the state of North Dakota, Earsley Dam is classified as having a low hazard potential and a moderate risk level. Despite not being rated for its condition assessment, the dam meets all state regulatory standards and undergoes regular inspections. With a spillway width of 160 feet and uncontrolled spillway type, Earsley Dam is designed to manage potential flooding events effectively.
For water resource and climate enthusiasts, Earsley Dam; Allan 1 stands out as a significant structure in the St. Paul District. Its strategic location and multiple purposes make it a vital component in the local ecosystem and water management infrastructure. With its low hazard potential and moderate risk level, Earsley Dam exemplifies how private entities can contribute to sustainable water resource management and climate resilience in the region.
Year Completed |
2005 |
Dam Height |
19.1 |
River Or Stream |
RUSSIAN SLOUGH CREEK |
Primary Dam Type |
Earth |
Surface Area |
33.7 |
Drainage Area |
21.34 |
Nid Storage |
351.4 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
19 |
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.
Earsley Dam; Allan 1