De Trobriand Gma #5 Reservoir Report
Last Updated: December 15, 2025
De Trobriand Gma #5 is a Federal-owned fish and wildlife pond located in McLean, North Dakota.
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Summary
Completed in 1989, this Earth-type dam stands at 12 feet tall and spans 800 feet in length, with a storage capacity of 250 acre-feet. The primary purpose of this structure is to provide habitat for fish and wildlife in the area, making it an important resource for conservation efforts in the region.
Managed by the North Dakota State Water Commission, De Trobriand Gma #5 is regulated and inspected by state authorities to ensure its safety and functionality. The dam has a low hazard potential and is currently rated as in "not rated" condition. Despite this, a moderate risk assessment score of 3 suggests that there may be potential issues that need to be addressed to maintain the integrity of the structure and prevent any potential risks to the surrounding area.
With a spillway width of 60 feet and a surface area of 29.6 acres, De Trobriand Gma #5 plays a crucial role in managing water resources in the region. While it may not be a high-risk structure, continued monitoring and maintenance are necessary to ensure its effectiveness in supporting the local ecosystem and mitigating potential hazards.
Year Completed |
1989 |
Dam Length |
800 |
Dam Height |
12 |
River Or Stream |
LAKE SAKAKAWEA-TR |
Primary Dam Type |
Earth |
Surface Area |
29.6 |
Drainage Area |
0.16 |
Nid Storage |
250 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
12 |
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 #5
38th Avenue Northwest McLean County