Turtle Lake (Lower) Reservoir Report

Last Updated: December 13, 2025

Turtle Lake (Lower) is a privately owned reservoir located in Moore, Oklahoma, with a primary purpose classified as 'Other.' Constructed in 2003 by Pollard Engineering, this stone dam stands at a height of 20.5 feet and has a hydraulic height of 18 feet.


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Summary

The reservoir has a maximum storage capacity of 94.2 acre-feet and serves as a critical water resource for the surrounding area.

With a drainage area of 118 square miles, Turtle Lake (Lower) plays a crucial role in managing water flow and storage. Its spillway, classified as 'Controlled,' has a width of 1 foot, and the dam's hazard potential is rated as 'High' with a fair condition assessment. The reservoir's risk assessment indicates a very high risk level (1), emphasizing the importance of proper management and maintenance to ensure the safety and functionality of this essential water resource.

Even though Turtle Lake (Lower) is privately owned, it is regulated by the Oklahoma Water Resources Board (OWRB) and undergoes regular state inspections and enforcement. Its location near the TRIB North Fork Little River contributes to its significance in the region's water management system. With a surface area of 6 acres and a normal storage capacity of 58.4 acre-feet, Turtle Lake (Lower) continues to be a vital component in maintaining water resources and climate resilience in Cleveland County, Oklahoma.

Year Completed

2003

Dam Length

280

Dam Height

20.5

River Or Stream

TRIB NORTH FORK LITTLE RIVER

Surface Area

6

Hydraulic Height

18

Drainage Area

118

Nid Storage

94.2

Structural Height

20.5

Hazard Potential

High

Foundations

Soil

Nid Height

21
       
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.