Mgdevlon Dam Reservoir Report
Nearby: Janitell #1 Pfaft #1
Last Updated: December 6, 2025
Mgdevlon Dam, located in Prairie, Montana, is a gravity dam with a structural height of 21 feet and a hydraulic height of 18 feet.
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Summary
Owned and managed by the Bureau of Land Management, this federal dam serves the primary purpose of water resource management for the region. With a storage capacity of 57.3 acre-feet and a drainage area of 3.9 square miles, Mgdevlon Dam plays a crucial role in regulating water flow in the unnamed drainage area it controls.
Despite its low hazard potential, Mgdevlon Dam undergoes regular inspections every five years to ensure its structural integrity and compliance with safety standards. The dam has not been rated for its condition assessment, but given its federal ownership and oversight by the Bureau of Land Management, it is likely well-maintained and safe for continued operation. Situated in a remote location with no associated structures, Mgdevlon Dam is a key component in the water resource infrastructure of the region, contributing to the conservation and management of water resources in Montana.
Water resource and climate enthusiasts will find Mgdevlon Dam an intriguing example of federal dam management in Montana. With its unique design and purpose, this gravity dam showcases the efforts of the Bureau of Land Management in ensuring water security and regulation in the area. The dam's location in a pristine natural setting adds to its appeal, highlighting the importance of sustainable water resource management in maintaining ecological balance and supporting local communities.
Dam Length |
731 |
River Or Stream |
UNNAMED DRAINAGE |
Primary Dam Type |
Gravity |
Surface Area |
11.5 |
Hydraulic Height |
18 |
Drainage Area |
3.9 |
Nid Storage |
57.3 |
Structural Height |
21 |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
21 |
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.
Mgdevlon Dam