Lenhart Lowell Reservoir Report

Last Updated: December 8, 2025

Lenhart Lowell is a privately owned dam located in Guthrie, Oklahoma, along the TR-Cottonwood River.


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Summary

It was completed in 1965 and stands at a height of 15 feet with a length of 475 feet. The dam serves a primary purpose of "Other" and is classified as an Earth dam with a Stone core and Soil foundation. It has a maximum storage capacity of 60 acre-feet and a normal storage of 25 acre-feet, covering a surface area of 5 acres.

Despite being categorized as having a low hazard potential, Lenhart Lowell is considered to have a very high risk due to its proximity to residential areas and potential impact in case of failure. The dam is regulated by the Oklahoma Water Resources Board and undergoes regular state inspections, with the last inspection conducted in August 2011. It has a controlled spillway with a width of 1 foot and is equipped with one valve as an outlet gate. The dam is located within the jurisdiction of Logan County and is situated at a distance of 19 miles from the city of Guthrie.

With its unique design and important role in water resource management, Lenhart Lowell serves as a significant structure in Oklahoma's infrastructure. Enthusiasts of water resources and climate will find this dam's construction details and risk assessment data intriguing, shedding light on the complexities of managing and maintaining critical infrastructure in the face of changing environmental conditions.

Year Completed

1965

Dam Length

475

Dam Height

15

River Or Stream

TR-COTTONWOOD RIVER

Primary Dam Type

Earth

Surface Area

5

Hydraulic Height

15

Nid Storage

60

Structural Height

15

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.