De Trobriand Gma #4 Reservoir Report
Last Updated: December 14, 2025
De Trobriand Gma #4 is a federal-owned Fish and Wildlife Pond located in McLean, North Dakota.
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Summary
Built in 1986, the earthen dam stands at a height of 11 feet and spans 300 feet in length, with a storage capacity of 56.9 acre-feet and a surface area of 12.3 acres. The dam serves as a critical habitat for fish and wildlife in the area, with the primary purpose of providing a safe and sustainable ecosystem for local species.
Managed by the North Dakota State Water Commission, De Trobriand Gma #4 is regulated, permitted, inspected, and enforced to ensure the safety and integrity of the structure. With a low hazard potential and moderate risk assessment, the dam is classified as not rated in terms of condition assessment. Although emergency preparedness measures such as an Emergency Action Plan (EAP) and inundation maps are not specified, the dam is equipped with an uncontrolled spillway with a width of 100 feet to manage excess water flow.
Overall, De Trobriand Gma #4 plays a vital role in maintaining the ecological balance and biodiversity of the surrounding area. With its strategic location on the Lake Sakakawea-TR stream and its Federal ownership under the NDGF, the dam serves as a key resource for water conservation, wildlife preservation, and environmental sustainability in North Dakota.
Year Completed |
1986 |
Dam Length |
300 |
Dam Height |
11 |
River Or Stream |
LAKE SAKAKAWEA-TR |
Primary Dam Type |
Earth |
Surface Area |
12.3 |
Drainage Area |
0.05 |
Nid Storage |
56.9 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
11 |
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.
De Trobriand Gma #4
38th Avenue Northwest McLean County