Ullman Dam; Naomi Reservoir Report
Last Updated: December 6, 2025
Ullman Dam, also known as Naomi Dam, is a private structure located in Adams County, North Dakota.
°F
°F
mph
Wind
%
Humidity
Summary
Built by the USFWS in 1997, this earth dam serves as a fish and wildlife pond along Cedar Creek. With a height of 9 feet and a length of 494 feet, the dam has a storage capacity of 54 acre-feet and covers a surface area of 5.8 acres.
Managed by the North Dakota State Water Commission, Ullman Dam is regulated, inspected, and enforced to ensure its safety and functionality. The dam has a low hazard potential and a moderate risk assessment rating. Although it currently lacks a formal condition assessment, the structure is designed with an uncontrolled spillway and is equipped with no outlet gates.
Water resource and climate enthusiasts will find Ullman Dam an interesting feature in the St. Paul District, as it not only supports local fish and wildlife populations but also plays a crucial role in water storage and management in the region. Its construction and maintenance reflect a commitment to environmental conservation and sustainable water resource practices.
Year Completed |
1997 |
Dam Length |
494 |
Dam Height |
9 |
River Or Stream |
CEDAR CREEK-TR |
Primary Dam Type |
Earth |
Surface Area |
5.8 |
Drainage Area |
12.8 |
Nid Storage |
54 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
9 |
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.
Ullman Dam; Naomi