Cosgrove John Preston Reservoir Report
Nearby: Oknoname 121010 Rosa
Last Updated: December 6, 2025
Cosgrove John Preston is a privately owned earth dam located in Pittsburg, Oklahoma, with the primary purpose of flood risk reduction.
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Summary
Completed in 1978, the dam stands at an impressive height of 50 feet, with a hydraulic height and structural height of 50 and 56 feet respectively. It has a storage capacity of 350 acre-feet, covering a surface area of 24 acres and serving a drainage area of 1.35 square miles. The dam is regulated by the Oklahoma Water Resources Board (OWRB) and undergoes regular inspections for safety and maintenance.
Despite its low hazard potential, Cosgrove John Preston poses a very high risk of inundation, earning a risk assessment rating of 1. The dam features a controlled spillway with a width of 3 feet and a single valve outlet gate for water release. The last inspection was conducted in June 2011, with an inspection frequency of 5 years. The dam's condition is currently assessed as "Not Rated," indicating the need for further evaluation to determine its structural integrity and safety measures. Given its critical role in flood risk reduction, the dam's risk management measures and emergency preparedness plans need to be closely monitored and updated to ensure the safety of the surrounding area and water resources.
In the Tulsa District of Oklahoma, Cosgrove John Preston serves as a vital infrastructure for managing the flow of the TR-BIG WILDHORSE CR stream. While it has not undergone significant modifications or improvements in recent years, the dam's importance in mitigating flood risks cannot be understated. With state jurisdiction and regulatory oversight in place, the dam plays a crucial role in protecting the local community from potential water-related disasters. Water resource and climate enthusiasts will find Cosgrove John Preston to be an intriguing case study in dam management and the intersection of infrastructure, environmental conservation, and public safety in the face of changing weather patterns and increasing risks of flooding.
Year Completed |
1978 |
Dam Height |
50 |
River Or Stream |
TR-BIG WILDHORSE CR |
Primary Dam Type |
Earth |
Surface Area |
24 |
Hydraulic Height |
50 |
Drainage Area |
1.35 |
Nid Storage |
350 |
Structural Height |
56 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
56 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Canadian River At Calvin
|
361cfs |
North Canadian River Near Wetumka
|
209cfs |
Little River Near Sasakwa
|
12cfs |
Kiamichi River Near Clayton
|
182cfs |
Fourche Maline Near Red Oak
|
1cfs |
Canadian River Near Whitefield
|
1190cfs |
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.
Cosgrove John Preston