Lake Mann Dam Reservoir Report
Nearby: Silver Lake Dam Tewaukon Nwr Pool 8n
Last Updated: December 13, 2025
Lake Mann Dam, also known as Tewaukon Pool 13a Dam, is a federal-owned structure located in Sargent, North Dakota.
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Summary
Managed by the US Fish and Wildlife Service, this earth-type dam was completed in 1965 and serves primarily as a fish and wildlife pond along the Wild Rice River. With a height of 9 feet and a length of 784 feet, the dam has a storage capacity of 658 acre-feet and covers a surface area of 58 acres.
Despite being classified as having a low hazard potential and fair condition assessment, Lake Mann Dam is subject to state regulation, permitting, inspection, and enforcement by the North Dakota State Water Commission. The dam features a controlled spillway with a width of 3 feet and other controlled outlet gates. The surrounding area has a very high risk assessment rating, indicating potential risks that require careful monitoring and management. The dam undergoes inspection every five years, with the last assessment conducted in October 2020.
Lake Mann Dam plays a crucial role in supporting fish and wildlife habitats in the region, highlighting the intersection between water resource management and environmental conservation efforts. Its construction and management are overseen by the Fish and Wildlife Service, reflecting a commitment to balancing human needs with ecological sustainability. As water resource and climate enthusiasts, understanding the significance of structures like Lake Mann Dam is vital in ensuring the preservation and stewardship of our natural resources for future generations.
Year Completed |
1965 |
Dam Length |
784 |
Dam Height |
9 |
River Or Stream |
Wild Rice River |
Primary Dam Type |
Earth |
Surface Area |
58 |
Hydraulic Height |
9 |
Drainage Area |
0.18 |
Nid Storage |
658 |
Structural Height |
9 |
Outlet Gates |
Other Controlled |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
9 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Wild Rice River Nr Rutland
|
21cfs |
Bear Creek Nr Oakes
|
5cfs |
Sheyenne River At Lisbon
|
222cfs |
James River At Nd-Sd State Line
|
194cfs |
Maple River Nr Enderlin
|
25cfs |
Antelope Creek At Dwight
|
25cfs |
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.
Lake Mann Dam