Johnson Reservoir Report
Nearby: Mckean Frank Eakins Pond 1
Last Updated: December 9, 2025
Johnson is a privately owned dam located in Ellis, Oklahoma, along the TR-CANADIAN river.
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Summary
Built in 1978 by the USDA NRCS, this earth dam stands at a height of 34 feet and has a normal storage capacity of 30 acre-feet. The dam is regulated by the Oklahoma Water Resources Board and is subject to state permitting, inspection, and enforcement measures to ensure its safety and functionality.
With a low hazard potential and a very high risk assessment rating, Johnson is equipped with a controlled spillway and a single valve outlet gate for water management. The dam has not been rated for its condition assessment, but is inspected every five years to monitor its structural integrity. It is essential for water resource and climate enthusiasts to track and understand the operations and management of dams like Johnson to mitigate risks and ensure the safety of surrounding communities and ecosystems.
Year Completed |
1978 |
Dam Length |
589 |
Dam Height |
34 |
River Or Stream |
TR-CANADIAN |
Primary Dam Type |
Earth |
Hydraulic Height |
31 |
Nid Storage |
60 |
Structural Height |
34 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
34 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Washita River Near Cheyenne
|
9cfs |
Wolf Ck At Lipscomb
|
1cfs |
Canadian Rv Nr Canadian
|
43cfs |
Washita River Near Hammon
|
10cfs |
Sweetwater Ck Nr Kelton
|
3cfs |
Sweetwater Creek Near Sweetwater
|
14cfs |
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.
Johnson