Gillespie No.1 Reservoir Report
Nearby: Hutchison No.2 Hutchison No.1
Last Updated: December 31, 2025
Gillespie No.1 is a privately owned earth dam located in Trail, Oklahoma, on Devils Creek.
°F
°F
mph
Wind
%
Humidity
Summary
Built in 1961 by the USDA NRCS, this dam stands at a height of 38 feet and serves primarily for flood risk reduction. With a maximum storage capacity of 80 acre-feet and a normal storage level of 50 acre-feet, Gillespie No.1 plays a crucial role in mitigating flood risks in the region.
Despite being classified as having a low hazard potential, Gillespie No.1 is considered to have a very high risk due to its structural characteristics. The dam features a controlled spillway with a width of 1 foot and an outlet gate for water release. The condition assessment of the dam is currently rated as "Not Rated" as of the last inspection in December 2010. While the risk assessment indicates a high level of risk, there are no specific risk management measures in place at this time.
As water resource and climate enthusiasts, the data on Gillespie No.1 provides valuable insights into the infrastructure that helps manage water resources and reduce flood risks in Ellis County, Oklahoma. Understanding the design, purpose, and risk factors of dams like Gillespie No.1 is crucial for ensuring the safety and resilience of our water systems in the face of changing climate patterns and increasing water-related challenges.
Year Completed |
1961 |
Dam Length |
192 |
Dam Height |
38 |
River Or Stream |
DEVILS CR |
Primary Dam Type |
Earth |
Hydraulic Height |
34 |
Nid Storage |
80 |
Structural Height |
38 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
38 |
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.
Gillespie No.1