Lemmert Dam Reservoir Report
Nearby: Dallman Dam Mietzner Road Dam
Last Updated: December 6, 2025
Lemmert Dam, located in Franklin, Nebraska, was completed in 1972 by Miller & Associates and the USDA NRCS.
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Summary
This earth dam stands at 25 feet high with a structural height of 32 feet, serving primarily for flood risk reduction along Thompson Creek. With a storage capacity of 216.8 acre-feet and a drainage area of 2.78 square miles, Lemmert Dam plays a crucial role in mitigating potential flood hazards in the region.
Owned by the local government and regulated by the Nebraska Department of Natural Resources, Lemmert Dam undergoes regular inspections to ensure its structural integrity. The dam is classified as satisfactory in terms of condition assessment, with the last inspection conducted in April 2018. With a normal storage capacity of 8.1 acre-feet, the dam covers a surface area of 2.6 acres and has a maximum discharge capacity of 343 cubic feet per second. The dam's primary purpose of flood risk reduction underscores its importance in safeguarding the surrounding communities from potential water-related disasters.
As an essential piece of infrastructure in the area, Lemmert Dam plays a vital role in water resource management and climate resilience efforts. With its strategic location in Riverton, Nebraska, the dam not only provides flood protection but also contributes to the overall water management system in the region. Supported by the Natural Resources Conservation Service and meeting state permitting and inspection requirements, Lemmert Dam stands as a testament to effective collaboration between local and federal agencies in ensuring water security and environmental sustainability in the area.
Year Completed |
1972 |
Dam Length |
772 |
Dam Height |
25 |
River Or Stream |
TR-THOMPSON CREEK |
Primary Dam Type |
Earth |
Surface Area |
2.6 |
Hydraulic Height |
24.7 |
Drainage Area |
2.78 |
Nid Storage |
216.8 |
Structural Height |
32 |
Foundations |
Soil |
Nid Height |
32 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Republican River Near Orleans
|
59cfs |
Republican River At Guide Rock
|
35cfs |
Prairie Dog C Nr Woodruff
|
0cfs |
Sappa Creek Near Stamford
|
4cfs |
Platte River Near Kearney
|
1810cfs |
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.
Lemmert Dam