Rolls Helen B Reservoir Report

Last Updated: December 6, 2025

Rolls Helen B is a privately owned earth dam located in Marlow, Oklahoma, with a primary purpose serving as "Other." Completed in 1950, this dam stands at 35 feet high and spans a length of 360 feet, with a storage capacity of 210 acre-feet.


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Summary

Situated on the TR-Little Beaver Creek, it is regulated by the Oklahoma Water Resources Board and undergoes state inspections, enforcement, and permitting processes.

Despite being classified as having a low hazard potential, Rolls Helen B poses a very high risk due to its condition assessment being "Not Rated." The dam features a controlled spillway and a single valve outlet gate. Although the last inspection was conducted in 2010, the structure is scheduled for inspection every 5 years to ensure its safety and functionality. With a risk assessment rating of "Very High (1)," there is a need for continuous monitoring and potential risk management measures to prevent any potential hazards or failures in the future.

Overall, Rolls Helen B serves as a vital water resource in Grady County, Oklahoma, contributing to flood control and water storage in the region. As a significant element in the local water infrastructure, it is essential for water resource and climate enthusiasts to stay informed about the dam's condition, regulatory status, and risk management efforts to ensure the safety and sustainability of this critical infrastructure in the face of changing environmental conditions.

Year Completed

1950

Dam Length

360

Dam Height

35

River Or Stream

TR-LITTLE BEAVER CR

Primary Dam Type

Earth

Surface Area

4

Hydraulic Height

35

Nid Storage

210

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

Rolls Helen BLittle Washita River near Cement Preview Little Washita River Near Cement
7.32cfs
7cfs
Rolls Helen BLittle Washita River near Cyril Preview Little Washita River Near Cyril
1.77cfs
2cfs
Rolls Helen BLittle Washita River ab SCS Pond No 26 nr Cyril Preview Little Washita River Ab Scs Pond No 26 Nr Cyril
0.09cfs
0cfs
Rolls Helen BLittle Washita River East of Ninnekah Preview Little Washita River East Of Ninnekah
19.8cfs
20cfs
Rolls Helen BWashita River at Alex Preview Washita River At Alex
243.0cfs
243cfs
Rolls Helen BEast Cache Creek near Walters Preview East Cache Creek Near Walters
29.3cfs
29cfs

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