John Groendyke Reservoir Report
Nearby: Helloms Oknoname 047007
Last Updated: December 14, 2025
John Groendyke is a private dam located in Garfield, Oklahoma, specifically in the city of Kremlin.
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Summary
It was completed in 1960 and primarily serves the purpose of flood risk reduction along the TR-SAND CR river or stream. The dam is classified as an Earth type, with a height of 20 feet and a length of 350 feet, providing a maximum storage capacity of 150 acre-feet.
Managed by the Oklahoma Water Resources Board, John Groendyke has a low hazard potential and is regularly inspected every 5 years to ensure its structural integrity. Despite its low hazard potential, the dam poses a very high risk, highlighting the importance of ongoing risk management measures. The dam features a controlled spillway and one outlet gate, with a spillway width of 1 foot, ensuring proper water discharge during high flow events. For water resource and climate enthusiasts, John Groendyke serves as a testament to the critical role of infrastructure in mitigating flood risks and protecting communities in Oklahoma.
Year Completed |
1960 |
Dam Length |
350 |
Dam Height |
20 |
River Or Stream |
TR-SAND CR |
Primary Dam Type |
Earth |
Hydraulic Height |
20 |
Nid Storage |
150 |
Structural Height |
20 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
20 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Skeleton Creek At Enid
|
7cfs |
Skeleton Creek Near Lovell
|
26cfs |
Salt Fork Arkansas River At Tonkawa
|
485cfs |
Cimarron River Near Dover
|
312cfs |
Chikaskia River Near Blackwell
|
226cfs |
Cimarron River Near Guthrie
|
453cfs |
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.
John Groendyke