Matthies William T Reservoir Report
Last Updated: December 24, 2025
Matthies William T is a privately owned earth dam located in Union City, Oklahoma, along the TR-Arapaho Creek.
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Summary
Completed in 1965, this structure stands at a height of 19 feet and spans 500 feet in length, with a storage capacity of 140 acre-feet. The dam is primarily used for purposes other than flood control or water supply, and is regulated and inspected by the Oklahoma Water Resources Board.
Despite being classified as having a low hazard potential, the risk assessment for Matthies William T rates it as very high (1), indicating the importance of proper maintenance and monitoring. The dam features a controlled spillway and a single valve outlet gate, with a condition assessment that is currently listed as "Not Rated". The last inspection took place in August 2010, and the structure is subject to inspections every five years to ensure its safety and integrity.
With its unique design and significant storage capacity, Matthies William T serves as a crucial water resource for the surrounding area. Its location in Canadian County, Oklahoma, makes it a focal point for water resource and climate enthusiasts interested in understanding the dynamics of dams and their impact on the local environment.
Year Completed |
1965 |
Dam Length |
500 |
Dam Height |
19 |
River Or Stream |
TR-ARAPAHO CREEK |
Primary Dam Type |
Earth |
Surface Area |
8 |
Hydraulic Height |
19 |
Nid Storage |
140 |
Structural Height |
19 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
19 |
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.
Matthies William T