Gregory Dam 4147 Reservoir Report
Last Updated: December 13, 2025
Gregory Dam 4147, located in Sarpy, Nebraska, plays a crucial role in flood risk reduction along the TR-Elkhorn River.
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Summary
Built in 1960, this privately owned earth dam stands at a height of 22.2 feet and has a length of 715 feet, providing a storage capacity of 70.7 acre-feet. Despite its low hazard potential, the dam's condition has been assessed as poor, highlighting the need for regular inspections and maintenance to ensure its continued effectiveness in mitigating flood risks in the region.
Managed by the Nebraska Department of Natural Resources, Gregory Dam 4147 is subject to state regulation, inspection, and enforcement. Although it has not undergone any modifications in recent years, the dam's maintenance and emergency preparedness measures should be closely monitored to address the identified condition concerns. Additionally, its location within Congressional District 02, Nebraska, under the representation of Don Bacon (R), emphasizes the importance of collaboration and support from federal and local stakeholders in safeguarding the surrounding communities from potential flooding events.
With a primary purpose of flood risk reduction, Gregory Dam 4147 serves as a critical infrastructure within the Kansas City District of the US Army Corps of Engineers. As water resource and climate enthusiasts, it is essential to recognize the vital role that dams like Gregory Dam 4147 play in protecting lives and property from the impacts of extreme weather events. By staying informed about the dam's condition, maintenance efforts, and emergency response plans, stakeholders can contribute to the resilience of the region's water infrastructure and enhance its ability to adapt to changing climate conditions.
Year Completed |
1960 |
Dam Length |
715 |
Dam Height |
22.2 |
River Or Stream |
TR-ELKHORN RIVER |
Primary Dam Type |
Earth |
Surface Area |
1.9 |
Hydraulic Height |
22.2 |
Drainage Area |
0.35 |
Nid Storage |
70.7 |
Structural Height |
22.2 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
22 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Platte R Nr Ashland
|
6290cfs |
Wahoo Cr At Ashland
|
78cfs |
Elkhorn River At Waterloo
|
1120cfs |
Platte R At Louisville Ne
|
8100cfs |
Platte River Nr Leshara
|
5270cfs |
Big Papillion Cr
|
38cfs |
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 |
|---|---|---|
Linoma
|
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Ashland RV Campground
|
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Eugene T. Mahoney State Park
|
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Walnut Creek - Papillion
|
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Louisville Lakes State Rec Area
|
Gregory Dam 4147
Chalco Hills Recreation Area