Clapp Dam Reservoir Report
Last Updated: December 6, 2025
Located in Jefferson County, Nebraska, Clapp Dam is a privately owned structure with a primary purpose of fire protection, stock, or small fish pond management.
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Summary
Completed in 1936, this earth dam stands at a height of 38 feet and has a hydraulic height of 25 feet, providing a maximum storage capacity of 100 acre-feet.
Serving as a vital resource for the local community, Clapp Dam spans 396 feet in length and covers a surface area of 6 acres. With a drainage area of 0.2 square miles and a maximum discharge capacity of 600 cubic feet per second, the dam is regulated and inspected by the Nebraska Department of Natural Resources to ensure its continued safety and functionality.
Despite being classified as having a low hazard potential, Clapp Dam is in satisfactory condition, as confirmed during its last inspection in June 2020. With a regular inspection frequency of 5 years, the dam is equipped to handle emergencies with updated emergency action plans and contacts. This essential water resource on the TR-Little Blue River contributes to the overall climate resilience and water management efforts in the region.
Year Completed |
1936 |
Dam Length |
396 |
Dam Height |
38 |
River Or Stream |
TR-LITTLE BLUE RIVER |
Primary Dam Type |
Earth |
Surface Area |
6 |
Hydraulic Height |
25 |
Drainage Area |
0.2 |
Nid Storage |
100 |
Structural Height |
38 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
38 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Little Blue R At Hollenberg
|
70cfs |
Little Blue River Near Fairbury
|
230cfs |
Mill C At Washington
|
8cfs |
L Blue R Nr Barnes
|
122cfs |
Big Blue R At Barneston Nebr
|
131cfs |
Big Blue R At Marysville
|
147cfs |
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.
Clapp Dam