Johnston J Reservoir Report
Nearby: Steele Ralph Osborn Grant
Last Updated: December 7, 2025
Johnston J is a privately owned earth dam located in Weleetka, Oklahoma, on TR-Long George Creek.
°F
°F
mph
Wind
%
Humidity
Summary
Completed in 1965, this dam stands at a height of 18 feet and has a storage capacity of 53 acre-feet. With a spillway type of Controlled and a maximum discharge of 802 cubic feet per second, this dam serves various purposes, including flood control and water supply.
Managed by the Oklahoma Water Resources Board, Johnston J has a low hazard potential and is currently rated as "Not Rated" in terms of condition assessment. Despite its age, the dam meets state regulatory requirements for inspection, enforcement, and permitting, ensuring its structural integrity and safety. In case of emergencies, there are provisions for an emergency action plan, though details on its preparation and guidelines adherence are not available.
With a very high risk assessment level, Johnston J remains a pivotal structure in managing water resources in Hughes County, Oklahoma. While the dam is not under the jurisdiction of any federal agency, it plays a crucial role in mitigating flood risks and ensuring water supply stability for the surrounding areas. As climate enthusiasts continue to monitor water resource management, the upkeep and maintenance of Johnston J will be essential in sustaining the ecosystem and community resilience in the region.
Year Completed |
1965 |
Dam Length |
250 |
Dam Height |
18 |
River Or Stream |
TR-LONG GEORGE CREEK |
Primary Dam Type |
Earth |
Surface Area |
7 |
Hydraulic Height |
18 |
Nid Storage |
53 |
Structural Height |
18 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
18 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
North Canadian River Near Wetumka
|
209cfs |
Little River Near Sasakwa
|
12cfs |
Canadian River At Calvin
|
361cfs |
North Canadian River At Shawnee
|
177cfs |
Little River Near Tecumseh
|
8cfs |
Deep Fork Near Beggs
|
141cfs |
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.
Johnston J