Hall No.3 Reservoir Report

Last Updated: December 5, 2025

Hall No.3 is a privately owned dam located in Major County, Oklahoma, designed by the USDA NRCS and regulated by the OWRB.


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Summary

Completed in 1974, this earth dam stands at a height of 30 feet with a hydraulic height of 28 feet. The dam has a storage capacity of 75 acre-feet and serves various purposes including flood control and water supply management for the surrounding area.

Despite being classified as having a low hazard potential, the risk assessment for Hall No.3 indicates a very high risk level. This is attributed to factors such as its age, condition assessment not being rated, and the absence of emergency action plans and inundation maps. The dam is equipped with a controlled spillway and a single valve outlet gate. The last inspection was conducted in August 2009, with an inspection frequency of every 5 years.

Water resource and climate enthusiasts will find Hall No.3 an intriguing case study due to its risk assessment results and the need for updated emergency preparedness measures. The dam's location in the TR-GYP CR stream watershed and its historical significance in the region make it a valuable asset to monitor in terms of climate change impacts on water resources. As discussions around dam safety and maintenance continue to evolve, Hall No.3 serves as a reminder of the importance of proper risk management and emergency planning for sustainable water infrastructure.

Year Completed

1974

Dam Length

236

Dam Height

30

River Or Stream

TR-GYP CR

Primary Dam Type

Earth

Hydraulic Height

28

Nid Storage

75

Structural Height

30

Outlet Gates

Valve - 1

Hazard Potential

Low

Foundations

Soil

Nid Height

30
       
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.