Morris Lake Reservoir Report

Last Updated: December 5, 2025

Morris Lake, located in Okmulgee, Oklahoma, is a popular recreational spot managed by the local government.


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Summary

This rockfill dam, completed in 1920, has a height of 27 feet and a storage capacity of 940 acre-feet. The lake spans 36 acres and is situated along the TR-Long Branch Creek, making it a serene getaway for water resource and climate enthusiasts.

Despite its low hazard potential, Morris Lake is equipped with a controlled spillway and a valve outlet gate for safety measures. The dam's condition is currently not rated, but it undergoes inspections every five years to ensure its structural integrity. This hidden gem in Hoffman offers a tranquil environment for outdoor activities and serves as a valuable water resource in the Tulsa District, Oklahoma.

With its very high risk assessment ranking, Morris Lake is closely monitored by the Oklahoma Water Resources Board. The lake's risk management measures are not specified, but its state-regulated status ensures that it is well-maintained for both recreational and environmental purposes. Whether you're seeking a peaceful retreat or interested in studying water management practices, Morris Lake is a must-visit destination for water resource and climate enthusiasts in the area.

Year Completed

1920

Dam Length

950

Dam Height

27

River Or Stream

TR-LONG BR. CREEK

Primary Dam Type

Rockfill

Surface Area

36

Hydraulic Height

27

Nid Storage

940

Structural Height

27

Outlet Gates

Valve - 1

Hazard Potential

Low

Foundations

Rock, Soil

Nid Height

27
       
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.