Weder John Reservoir Report
Nearby: Harper County Yauk Freda A
Last Updated: December 21, 2025
Weder John is a privately owned earth dam located in Harper County, Oklahoma, along the TR Cimarron River.
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Summary
Completed in 1984, this dam stands at a height of 35 feet and has a storage capacity of 130 acre-feet. With a controlled spillway and a low hazard potential, this structure is classified as having a very high risk assessment rating.
Managed by the Oklahoma Water Resources Board, Weder John is subject to state regulation, permitting, inspection, and enforcement. While it has not been rated for its overall condition, the dam has a valve outlet gate and is inspected every 5 years. Despite its age, the dam is considered to be in good standing and poses a low risk to the surrounding area.
Although Weder John serves a primary purpose of "Other", its significance lies in its contribution to water resource management and climate adaptation efforts in the region. As a critical infrastructure in the Tulsa District, this dam plays a key role in flood control, water storage, and environmental protection along the Cimarron River. With its state-regulated status and low hazard potential, Weder John stands as a testament to effective water resource management in Oklahoma.
Year Completed |
1984 |
Dam Height |
35 |
River Or Stream |
TR CIMARRON RIVER |
Primary Dam Type |
Earth |
Surface Area |
12 |
Hydraulic Height |
35 |
Nid Storage |
130 |
Structural Height |
35 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
35 |
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.
Weder John