Longley Dam Reservoir Report
Nearby: Day No 1 Day Harold Joe
Last Updated: January 12, 2026
Longley Dam, located in Camargo, Oklahoma, is a privately owned structure designed by the USDA NRCS and regulated by the Oklahoma Water Resources Board.
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Summary
Completed in 1985, the dam serves as a crucial flood risk reduction measure along the TR-Canadian River. Standing at a height of 34 feet and with a length of 554 feet, Longley Dam has a storage capacity of 39 acre-feet, providing essential protection for the surrounding area.
With a controlled spillway and a low hazard potential, Longley Dam is a key component in managing water resources in Dewey County. Despite being classified as "Not Rated" in terms of condition assessment, the dam is inspected every five years to ensure its structural integrity and operational efficiency. The risk assessment for Longley Dam is rated as "Very High (1)" due to its importance in flood risk reduction, highlighting its critical role in safeguarding the local community from potential water-related disasters.
Although Longley Dam does not have associated locks or high-volume storage capacity, its strategic location and design make it an indispensable asset in water resource management in Oklahoma. As climate change continues to impact the region, structures like Longley Dam play a vital role in mitigating the risks of flooding and ensuring the sustainable use of water resources for future generations.
Year Completed |
1985 |
Dam Length |
554 |
Dam Height |
34 |
River Or Stream |
TR-CANADIAN RIVER |
Primary Dam Type |
Earth |
Surface Area |
1 |
Hydraulic Height |
34 |
Drainage Area |
0.22 |
Nid Storage |
39 |
Structural Height |
34 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
34 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
North Canadian River Near Seiling
|
107cfs |
North Canadian River At Woodward
|
80cfs |
Washita River Near Hammon
|
12cfs |
Cimarron River Near Waynoka
|
150cfs |
Washita River Near Foss
|
6cfs |
Washita River Near Cheyenne
|
11cfs |
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.
Longley Dam