2008 Hartmann Dam Reservoir Report
Nearby: Hartmann Dam 3892 Rothell Dam
Last Updated: December 6, 2025
The 2008 Hartmann Dam, located in Johnson, Nebraska, is a private dam constructed in 2008 for purposes of flood risk reduction and other water resource management activities.
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Summary
This Earth-type dam stands at a height of 25 feet with a hydraulic height of 22.9 feet, providing a vital structure in the management of the TR-SAMPSON BR TURKEY CREEK waterway. With a storage capacity of 92 acre-feet and a normal storage level of 34 acre-feet, the dam covers a surface area of 4.9 acres and serves a drainage area of 0.3 square miles.
Managed by the Nebraska Department of Natural Resources, the 2008 Hartmann Dam has a low hazard potential and is rated to be in satisfactory condition as of the last inspection conducted in June 2016. The dam's emergency action plan and risk management measures are currently under evaluation, showcasing a commitment to ensuring the safety and efficiency of this essential water management infrastructure. With a Congressional representative of Adrian Smith (R), the dam plays a crucial role in the overall water resource management strategy in Congressional District 03, Nebraska.
As a key component in the water resource infrastructure of the region, the 2008 Hartmann Dam serves as a vital tool in flood risk reduction and water resource management for the local community. With its low hazard potential and satisfactory condition, the dam stands as a reliable structure in ensuring the safety and security of the surrounding area. With continued inspection and maintenance, the dam remains poised to play a critical role in preserving the water resources and climate resilience of Johnson, Nebraska, for years to come.
Year Completed |
2008 |
Dam Length |
155 |
Dam Height |
25 |
River Or Stream |
TR-SAMPSON BR TURKEY CREEK |
Primary Dam Type |
Earth |
Surface Area |
4.9 |
Hydraulic Height |
22.9 |
Drainage Area |
0.3 |
Nid Storage |
92 |
Structural Height |
32 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
32 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Big Blue R At Barneston Nebr
|
131cfs |
North Fork Big Nemaha River At Humboldt
|
67cfs |
Turkey C Nr Seneca
|
15cfs |
Little Nemaha River At Auburn
|
82cfs |
Turkey Creek Near De Witt
|
10cfs |
Salt Creek At Roca
|
5cfs |
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.
2008 Hartmann Dam