Granada Lake Reservoir Report

Last Updated: December 8, 2025

Granada Lake, located in Shawnee, Oklahoma, is a privately owned reservoir designed by the USDA NRCS with a primary purpose of serving as a water resource.


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Summary

Completed in 1976, this earth dam stands at 16 feet tall and stretches 796 feet in length, providing a storage capacity of 70 acre-feet. The dam is regulated by the Oklahoma Water Resources Board (OWRB) and is subject to state permitting, inspection, and enforcement to ensure its safety and compliance with regulations.

With a high hazard potential and a satisfactory condition assessment, Granada Lake poses risks that are managed through established measures. The reservoir is equipped with a controlled spillway and a valve outlet gate, and its emergency action plan (EAP) was last revised in May 2015. The region's Representative, Kendra S. Horn (D), oversees the area in the Tulsa District, where the reservoir contributes to the water supply for the community. Water and climate enthusiasts can find intrigue in the intricate design and management of Granada Lake, as well as the crucial role it plays in the local ecosystem and water infrastructure.

Year Completed

1976

Dam Length

796

Dam Height

16

River Or Stream

TR-N. CANADIAN RIV

Primary Dam Type

Earth

Hydraulic Height

16

Nid Storage

70

Structural Height

16

Outlet Gates

Valve - 1

Hazard Potential

High

Foundations

Soil

Nid Height

16
       
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.