G&H Decoy Reservoir Report
Nearby: Oknoname 111072 Oknoname 111055
Last Updated: January 12, 2026
G&H Decoy, located in Henryetta, Oklahoma, is a privately owned dam that was completed in 1950.
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Summary
It stands at a height of 30 feet with a hydraulic height of 30 feet and a structural height of 30 feet. The dam, primarily made of earth with stone core and soil foundation, spans a length of 3360 feet and has a storage capacity of 90 acre-feet. Its primary purpose is categorized as "Other" and it serves as a controlled spillway with a width of 1 foot.
The dam is regulated by the Oklahoma Water Resources Board (OWRB) and is subject to state jurisdiction, permitting, inspection, and enforcement. It is situated on TR-Coal Creek and falls under the Tulsa District of the US Army Corps of Engineers. Despite being classified as having low hazard potential, the risk assessment for G&H Decoy indicates a very high risk level (1). The dam has not been rated for its condition assessment, and the last inspection was conducted in November 2001, with an inspection frequency of 5 years.
While G&H Decoy poses a low hazard potential, its risk assessment highlights a very high risk level, warranting attention and potential management measures. As a privately owned structure, its maintenance and safety are crucial for the surrounding community and the environment. With its controlled spillway and valve outlet gates, the dam serves an essential function in managing water resources in the area. Its history, construction details, and regulatory oversight provide valuable insights for water resource and climate enthusiasts interested in understanding the complexities of dam infrastructure in Oklahoma.
Year Completed |
1950 |
Dam Length |
3360 |
Dam Height |
30 |
River Or Stream |
TR-COAL CREEK |
Primary Dam Type |
Earth |
Surface Area |
2 |
Hydraulic Height |
30 |
Nid Storage |
90 |
Structural Height |
30 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
30 |
Seasonal Comparison
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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.
G&H Decoy