Hollis J.B. Reservoir Report

Last Updated: January 2, 2026

Hollis J.B., also known as Dr.


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Summary

Hollis Lake, is a private water resource structure located in Greer, Oklahoma, along Root Creek. Built in 1960 by the USDA NRCS, this Earth-type dam stands at a height of 35 feet with a hydraulic height of 30 feet and a length of 545 feet. It serves multiple purposes, including providing a storage capacity of 577 acre-feet and a surface area of 50 acres.

Managed by the OWRB, Hollis J.B. is state-regulated and undergoes regular inspections, with a low hazard potential but a very high risk assessment rating. Despite its condition being marked as "Not Rated," it is equipped with a controlled spillway and a single valve outlet gate. The dam's emergency action plan status, risk management measures, and inundation maps are currently not available, making it crucial for stakeholders to stay informed and prepared for any potential risks associated with this essential water resource structure.

Overall, Hollis J.B. plays a vital role in water management in the region, with a rich history dating back to the 1960s. Water resource and climate enthusiasts will appreciate the intricate details of this structure, its design specifications, and the ongoing efforts to ensure its safety and functionality. As a significant component of the local water infrastructure, Hollis J.B. underscores the importance of sustainable water resource management practices in the face of changing climate conditions.

Year Completed

1960

Dam Length

545

Dam Height

35

River Or Stream

ROOT CREEK

Primary Dam Type

Earth

Surface Area

50

Hydraulic Height

30

Nid Storage

577

Structural Height

35

Outlet Gates

Valve - 1

Hazard Potential

Low

Foundations

Soil

Nid Height

35
       
Seasonal Comparison

Weather Forecast

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Nearby Streamflow Levels

Hollis J.B.Elm Fork of North Fork Red River nr Carl Preview Elm Fork Of North Fork Red River Nr Carl
4.14cfs
4cfs
Hollis J.B.Salt Fork Red River at Mangum Preview Salt Fork Red River At Mangum
44.1cfs
44cfs
Hollis J.B.North Fork Red River near Carter Preview North Fork Red River Near Carter
27.2cfs
27cfs
Hollis J.B.Salt Fk Red Rv nr Wellington Preview Salt Fk Red Rv Nr Wellington
2.21cfs
2cfs
Hollis J.B.North Fork Red River blw Altus Dam nr Lugert Preview North Fork Red River Blw Altus Dam Nr Lugert
0.0cfs
0cfs
Hollis J.B.N Fk Red Rv nr Shamrock Preview N Fk Red Rv Nr Shamrock
2.9cfs
3cfs

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.
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Nearby Reservoirs