Dallmann Dam Reservoir Report
Nearby: Maska Dam Dallman Dam
Last Updated: December 6, 2025
Dallmann Dam, located in Franklin, Nebraska, is a privately-owned structure designed to reduce flood risks along the TR-W BR THOMPSON CREEK.
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Summary
Built in 1960, this earth dam stands at a height of 17.2 feet and spans 430 feet in length, with a storage capacity of 52.9 acre-feet. Despite its low hazard potential, the dam is regulated and inspected by the Nebraska Department of Natural Resources to ensure its structural integrity.
With a primary purpose of flood risk reduction, Dallmann Dam plays a crucial role in protecting the surrounding area from potential inundation. Its stone core and soil foundation contribute to its stability, while its location in SWS22T3R14W serves as a key point for monitoring and maintenance. The dam's normal storage capacity of 13.9 acre-feet and surface area of 5.4 acres make it a significant feature in the local water resource management landscape.
As climate change continues to pose challenges to water resources, Dallmann Dam stands as a testament to the importance of effective flood control infrastructure. With its capacity to mitigate flood risks and protect downstream communities, this dam serves as a vital asset in safeguarding the environment and ensuring the sustainable management of water in the region.
Year Completed |
1960 |
Dam Length |
430 |
Dam Height |
17.2 |
River Or Stream |
TR-W BR THOMPSON CREEK |
Primary Dam Type |
Earth |
Surface Area |
5.4 |
Hydraulic Height |
17.2 |
Drainage Area |
0.86 |
Nid Storage |
52.9 |
Structural Height |
17.2 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
17 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Republican River At Guide Rock
|
35cfs |
Republican River Near Orleans
|
59cfs |
Platte River Near Kearney
|
1810cfs |
Prairie Dog C Nr Woodruff
|
0cfs |
Sappa Creek Near Stamford
|
4cfs |
White Rock C Nr Burr Oak
|
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.
Dallmann Dam