Mallard Island Gma #4;5;7 Reservoir Report
Last Updated: December 14, 2025
Mallard Island Gma #4;5;7 is a Federal-owned fish and wildlife pond situated in McLean, North Dakota.
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Summary
Completed in 1988, this earth dam structure stands at 8 feet high and has a storage capacity of 279 acre-feet, with a surface area of 48.2 acres. The primary purpose of the dam is to support fish and wildlife in the area, making it a vital resource for conservation efforts in the region.
Managed by the North Dakota Game and Fish Department, Mallard Island Gma #4;5;7 is regulated by the North Dakota State Water Commission. Despite its low hazard potential, the risk assessment for the dam is rated as moderate (3), highlighting the importance of monitoring and maintenance activities to ensure its continued safety and functionality. While the condition assessment is currently not rated, regular inspections and adherence to regulatory guidelines are in place to address any potential issues that may arise.
Located on Lake Sakakawea-TR, Mallard Island Gma #4;5;7 plays a crucial role in supporting the local ecosystem and providing a habitat for various species of fish and wildlife. With a spillway width of 20 feet and uncontrolled spillway type, the dam is equipped to manage water flow effectively. As climate change continues to impact water resources, the preservation and proper management of structures like Mallard Island Gma #4;5;7 are essential for ensuring the sustainability of the environment and the communities that depend on it.
Year Completed |
1988 |
Dam Height |
8 |
River Or Stream |
LAKE SAKAKAWEA-TR |
Primary Dam Type |
Earth |
Surface Area |
48.2 |
Drainage Area |
0.28 |
Nid Storage |
279 |
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 #4;5;7
McLean County