Thompson Dam 4174 Reservoir Report
Nearby: Buffalo Creek Gs-19 Scholting Dam
Last Updated: December 8, 2025
Thompson Dam 4174, located in Sarpy, Nebraska, is a privately owned earth dam that was completed in the year 2000 for the primary purpose of flood risk reduction along the TR-Platte River.
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Summary
With a height of 34.5 feet and a length of 635 feet, the dam has a storage capacity of 175.6 acre-feet and covers a surface area of 4.5 acres. Despite its low hazard potential, the dam's condition assessment is rated as poor, highlighting the need for maintenance and improvement to ensure its effectiveness in mitigating flood risks.
Managed by the Nebraska Department of Natural Resources, Thompson Dam 4174 is subject to state regulation, permitting, inspection, and enforcement to maintain safety standards and compliance with regulatory requirements. The dam stands in Congressional District 02, Nebraska, with Representative Don Bacon (R) serving the area. Despite its structural deficiencies, the dam has not been modified in recent years, raising concerns about its ability to withstand potential flooding events. Emergency action plans and risk assessments for the dam are currently unavailable, emphasizing the importance of proactive measures to address safety concerns and ensure proper management of the water resource.
As a significant component of flood risk management in the region, Thompson Dam 4174 plays a crucial role in protecting the surrounding area from potential inundation. However, the dam's poor condition assessment underscores the need for immediate attention to address structural vulnerabilities and enhance its capacity to withstand future flood events. Collaboration between stakeholders, regulatory agencies, and the private owner is essential to develop and implement strategies to improve the dam's safety and effectiveness in mitigating flood risks for the community and the environment.
Year Completed |
2000 |
Dam Length |
635 |
Dam Height |
34.5 |
River Or Stream |
TR-PLATTE RIVER |
Primary Dam Type |
Earth |
Surface Area |
4.5 |
Hydraulic Height |
34.5 |
Drainage Area |
1.24 |
Nid Storage |
175.6 |
Structural Height |
34.5 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
35 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Platte R At Louisville Ne
|
5530cfs |
Platte R Nr Ashland
|
6290cfs |
Wahoo Cr At Ashland
|
78cfs |
Salt Creek At Greenwood
|
125cfs |
Rock Creek Near Ceresco
|
14cfs |
Elkhorn River At Waterloo
|
1120cfs |
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.
Area Campgrounds
| Location | Reservations | Toilets |
|---|---|---|
Louisville Lakes State Rec Area
|
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Eugene T. Mahoney State Park
|
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Ashland RV Campground
|
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Linoma
|
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Walnut Creek - Papillion
|
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Weeping Water
|
Thompson Dam 4174
Lake 2
Schramm Park State Recreational Area
Platte River State Park
Eugene T Mahoney State Park
Chalco Hills Recreation Area
Mission Park West