Gregory Reservoir Report
Nearby: Mcintire Frank Lake
Last Updated: December 5, 2025
Gregory is a privately-owned dam located in Bryan County, Oklahoma, specifically in the city of Arnett Church.
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Summary
The dam, designed by the USDA NRCS, serves the primary purpose of irrigation and was completed in 1977. It stands at a height of 20 feet with a hydraulic height of 18 feet, and a length of 856 feet, impounding the waters of the TR-Blue River.
This earth dam has a low hazard potential and a very high risk assessment rating. It is regulated by the Oklahoma Water Resources Board (OWRB) and undergoes regular state inspections and enforcement. Gregory has a storage capacity of 85 acre-feet, with a normal storage level of 50 acre-feet. The spillway, controlled with a width of 1 foot, helps manage a maximum discharge of 394 cubic feet per second.
Despite not being rated for its condition, Gregory remains a crucial structure for irrigation purposes in the region. It is situated within the Fort Worth District of the US Army Corps of Engineers and falls under the jurisdiction of the state of Oklahoma. With its intricate design and vital role in water resource management, Gregory stands as a testament to sustainable irrigation practices in the area.
Year Completed |
1977 |
Dam Length |
856 |
Dam Height |
20 |
River Or Stream |
TR-BLUE RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
18 |
Nid Storage |
85 |
Structural Height |
20 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
20 |
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.
Gregory