Mccaskill No.1 Reservoir Report
Last Updated: December 12, 2025
Mccaskill No.1 is a privately owned earth dam located in Garvin, Oklahoma, along the TR-ROCK CREEK river or stream.
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Summary
Built in 1977 by the USDA NRCS, this dam stands at a height of 25 feet and has a storage capacity of 60 acre-feet. With a controlled spillway and one valve outlet gate, the dam serves a primary purpose of "Other" and is regulated by the Oklahoma Water Resources Board (OWRB).
Despite being classified as a low hazard potential structure, Mccaskill No.1 faces a very high risk assessment due to its location and condition assessment being listed as "Not Rated." The dam has not been inspected since April 2010, with an inspection frequency of 5 years. The surrounding area has a high risk of inundation, indicating a need for updated emergency action plans and risk management measures to ensure the safety and security of the dam and the community it serves.
For water resource and climate enthusiasts, Mccaskill No.1 presents an intriguing case study in dam infrastructure and risk management. With its unique design and history of construction, this dam highlights the importance of regular inspections and maintenance to mitigate potential hazards and ensure the continued functionality of water storage and flood control systems in Oklahoma. As climate change continues to impact water resources, understanding the risks and vulnerabilities of structures like Mccaskill No.1 is crucial for sustainable water management in the region.
Year Completed |
1977 |
Dam Length |
550 |
Dam Height |
25 |
River Or Stream |
TR-ROCK CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
25 |
Nid Storage |
60 |
Structural Height |
25 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
25 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Washita River Near Pauls Valley
|
329cfs |
Rock Creek At Sulphur
|
8cfs |
North Criner Creek Near Criner
|
1cfs |
Walnut Creek At Purcell
|
28cfs |
Canadian River At Purcell
|
201cfs |
Washita River At Alex
|
236cfs |
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.
Mccaskill No.1