London Tom Reservoir Report
Last Updated: January 12, 2026
London Tom is a privately-owned earth dam located in Lamar, Cleveland, Oklahoma.
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Summary
Built in 1980, this structure stands at a height of 25 feet and has a maximum storage capacity of 88 acre-feet. With a controlled spillway type and a low hazard potential, London Tom serves various purposes, including flood control and water supply management for the surrounding area.
Managed by the Oklahoma Water Resources Board, London Tom is regularly inspected and meets state regulatory standards for permitting, inspection, and enforcement. Despite its low hazard potential, the risk assessment for this dam is classified as very high, indicating the need for effective risk management measures. The dam's primary purpose is listed as "Other," suggesting its importance in supporting water resource management activities along the TR-JOINTER CR river or stream.
Located within the Tulsa District, London Tom is a crucial infrastructure in the region, with a history of safe operation and maintenance. The dam features a valve outlet gate and has a history of regular inspections, although its condition assessment is marked as "Not Rated." Overall, London Tom stands as a testament to the importance of proper dam management and maintenance in safeguarding water resources and mitigating climate-related risks in the area.
Year Completed |
1980 |
Dam Length |
350 |
Dam Height |
25 |
River Or Stream |
TR-JOINTER CR |
Primary Dam Type |
Earth |
Hydraulic Height |
15 |
Nid Storage |
88 |
Structural Height |
25 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
25 |
Seasonal Comparison
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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.
London Tom