Lopez Martin J Reservoir Report

Last Updated: December 10, 2025

Lopez Martin J is a private dam located in Oklahoma City, Oklahoma, along the TR-North Canadian River.


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Summary

This recreational dam was completed in 1965 and stands at a height of 15 feet with a hydraulic height of 14 feet. The dam is primarily used for recreation and has a storage capacity of 73 acre-feet, with a maximum discharge of 880 cubic feet per second.

Managed by the Oklahoma Water Resources Board, Lopez Martin J has a controlled spillway type with a spillway width of 1 foot. The dam's hazard potential is rated as low, with a very high risk assessment score of 1. Although the condition assessment is currently listed as "Not Rated," the dam undergoes inspections every 5 years to ensure its safety and stability.

While Lopez Martin J has not been modified in recent years, it remains an important structure for water resource and climate enthusiasts in the area. With its stone core and soil foundation, this earth dam serves as a key recreational spot in Oklahoma, offering opportunities for outdoor activities along the North Canadian River. Despite its low hazard potential, regular inspections and risk management measures are in place to ensure the safety of this iconic dam for both visitors and the surrounding community.

Year Completed

1965

Dam Length

370

Dam Height

15

River Or Stream

TR-NORTH CANADIAN RIV

Primary Dam Type

Earth

Hydraulic Height

14

Nid Storage

73

Structural Height

14

Outlet Gates

Valve - 1

Hazard Potential

Low

Foundations

Soil

Nid Height

15
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.