Hiddenwood Lake Dam Reservoir Report
Last Updated: December 14, 2025
Hiddenwood Lake Dam, located in Ward County, North Dakota, was completed in 1933 by the Ward County Engineer and serves as a crucial flood risk reduction infrastructure along the Missouri River.
°F
°F
mph
Wind
%
Humidity
Summary
The dam, primarily constructed of earth and stone materials with a height of 18.2 feet, has a normal storage capacity of 1780 acre-feet and a maximum storage of 2250 acre-feet, covering a surface area of 131 acres.
Despite being classified with a low hazard potential, the dam is regulated and inspected by the North Dakota State Water Commission (NDSWC) to ensure its safety and integrity. The dam is not equipped with outlet gates or locks, and its spillway is uncontrolled. Although the condition assessment is currently not rated, the risk assessment for Hiddenwood Lake Dam is considered moderate, highlighting the importance of ongoing monitoring and maintenance to mitigate potential risks and safeguard the surrounding community and environment from flooding events.
Year Completed |
1933 |
Dam Height |
18.2 |
River Or Stream |
MISSOURI RIVER-TR |
Primary Dam Type |
Earth |
Surface Area |
131 |
Drainage Area |
8 |
Nid Storage |
2250 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
18 |
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.
Hiddenwood Lake Dam