Beaulieu Lake Reservoir Report
Nearby: Sand Hill Lake Bejou Wma
Last Updated: December 5, 2025
Beaulieu Lake, located in Mahnomen, Minnesota, is a picturesque reservoir with a rich history dating back to its completion in 1922.
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Summary
This gravity dam, standing at a height of 10 feet and stretching 300 feet in length, serves as a vital water resource for the surrounding area. With a normal storage capacity of 1128 acre-feet and a drainage area of 43.6 square miles, Beaulieu Lake plays a crucial role in managing water flow and storage in the region.
Despite its age, Beaulieu Lake has a low hazard potential and is currently rated as "Not Rated" in terms of condition assessment. The dam's primary purpose is categorized as "Other," with a design by DU and ownership by the Federal government. The reservoir's location near Marsh Creek makes it a valuable asset for water management and conservation efforts in the area. With its serene surroundings and important role in water resource management, Beaulieu Lake stands as a testament to the intersection of engineering, nature, and sustainability in the beautiful state of Minnesota.
Year Completed |
1922 |
Dam Length |
300 |
Dam Height |
10 |
River Or Stream |
MARSH CREEK - TR |
Primary Dam Type |
Gravity |
Surface Area |
300 |
Hydraulic Height |
5 |
Drainage Area |
43.6 |
Nid Storage |
1128 |
Structural Height |
10 |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
10 |
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.
Beaulieu Lake