Hamann Dam Reservoir Report
Nearby: Petri Dam; Robert White Lake Dam
Last Updated: December 13, 2025
Hamann Dam, located in North Dakota, was completed in 1935 and serves multiple purposes including fire protection, stock maintenance, and as a small fish pond.
°F
°F
mph
Wind
%
Humidity
Summary
This private dam, with a height of 44 feet and a length of 530 feet, holds a storage capacity of 180.3 acre-feet and covers a surface area of 17.5 acres. The dam is primarily made of earth with a stone core and soil foundation, and is regulated by the North Dakota State Water Commission.
Although Hamann Dam has a low hazard potential, its condition assessment is currently not rated, with the last inspection dating back to June 1986. Despite the moderate risk associated with the dam, it meets state permitting, inspection, and enforcement requirements. The dam's spillway is uncontrolled, with no outlet gates, and it is situated along the Little Missouri River-TR. With its historical significance and multi-purpose functionality, Hamann Dam remains a key feature in the water resource network of Slope County, North Dakota.
Year Completed |
1935 |
Dam Length |
530 |
Dam Height |
44 |
River Or Stream |
LITTLE MISSOURI-TR |
Primary Dam Type |
Earth |
Surface Area |
17.5 |
Drainage Area |
1.5 |
Nid Storage |
180.3 |
Structural Height |
47 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
47 |
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.
Hamann Dam