Gilliland Dam 1 Reservoir Report
Nearby: County Road 387 Dam Lashley Dam
Last Updated: December 5, 2025
Gilliland Dam 1, located in Nebraska, was completed in 1967 and designed by the USDA NRCS.
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Summary
This private dam, owned by a private entity, serves the primary purpose of flood risk reduction along TR-Cedar Creek. With a structural height of 30 feet and a hydraulic height of 27 feet, the dam stands at 28 feet tall and spans a length of 408 feet.
The dam has a normal storage capacity of 72 acre-feet and a maximum storage of 297 acre-feet, covering a surface area of 14 acres and draining a 2.7 square mile watershed. Despite being classified as low hazard potential, the dam's condition assessment remains unrated as of the last inspection in April 2019. Operated by the Natural Resources Conservation Service, Gilliland Dam 1 plays a crucial role in managing water resources and mitigating flood risks in the region.
With state regulatory oversight from the Nebraska Department of Natural Resources, this Earth dam constructed with Stone core types and soil foundations undergoes regular inspections and maintenance to ensure its integrity and functionality. As water resource and climate enthusiasts, the details of Gilliland Dam 1's design, operation, and purpose offer valuable insights into the efforts to protect communities and infrastructure from the impacts of extreme weather events and flooding in the area.
Year Completed |
1967 |
Dam Length |
408 |
Dam Height |
28 |
River Or Stream |
TR-CEDAR CREEK |
Primary Dam Type |
Earth |
Surface Area |
14 |
Hydraulic Height |
27 |
Drainage Area |
2.7 |
Nid Storage |
297 |
Structural Height |
30 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
30 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
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.
Gilliland Dam 1