Mallard Island Gma #6 Reservoir Report
Last Updated: December 14, 2025
Mallard Island Gma #6 is a Federal-owned fish and wildlife pond located in McLean, North Dakota.
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Summary
Built in 1988, this Earth-type dam stands at 8 feet tall and has a storage capacity of 125 acre-feet. The primary purpose of this structure is to provide habitat for aquatic life and support conservation efforts in the area.
Managed by the North Dakota Game and Fish Department, Mallard Island Gma #6 is regulated by the North Dakota State Water Commission. With a low hazard potential and moderate risk assessment rating, this dam serves as a crucial component of the local ecosystem. Although its condition is currently rated as "Not Rated", regular inspections and maintenance ensure its continued functionality and safety.
Despite its uncontrolled spillway type, Mallard Island Gma #6 poses minimal risk to surrounding areas. With a surface area of 17.4 acres and a drainage area of 0.27 square miles, this structure plays a vital role in water resource management and climate resilience efforts in North Dakota.
Year Completed |
1988 |
Dam Height |
8 |
River Or Stream |
LAKE SAKAKAWEA-TR |
Primary Dam Type |
Earth |
Surface Area |
17.4 |
Drainage Area |
0.27 |
Nid Storage |
125 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
8 |
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.
Mallard Island Gma #6
McLean County