John Arambel Reservoir Report

Last Updated: December 5, 2025

John Arambel is a private water resource located in Sublette, Wyoming, near the JONAH GULCH stream.


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Summary

This earth dam serves multiple purposes including fire protection, stock watering, and small fish pond management. With a structural height of 22 feet and a storage capacity of 728 acre-feet, this dam plays a crucial role in water management in the region. It has a low hazard potential and is in fair condition, last inspected in September 2021.

Owned privately, John Arambel is regulated by the Wyoming State Engineer's Office and undergoes regular inspections and enforcement to ensure its safety and functionality. The dam features a slide gate outlet and an uncontrolled spillway with a width of 54 feet. It has a moderate risk assessment rating of 3, highlighting the importance of proper risk management measures. Despite its remote location, this dam plays a vital role in supporting local fire protection efforts and providing water for livestock and wildlife.

Situated in Congressional District 00 in Wyoming, John Arambel stands as a testament to the importance of sustainable water resource management in arid regions. With a drainage area of 34.66 square miles and a maximum discharge of 1315 cubic feet per second, this dam plays a crucial role in regulating water flow and providing essential services to the local community. As climate change impacts water resources, the maintenance and proper management of structures like John Arambel become increasingly important for ensuring water security and resilience in the face of environmental challenges.

Dam Length

770

Dam Height

14

River Or Stream

JONAH GULCH

Primary Dam Type

Earth

Surface Area

97

Hydraulic Height

10

Drainage Area

34.66

Nid Storage

728

Structural Height

22

Outlet Gates

Slide (sluice gate) - 1

Hazard Potential

Low

Foundations

Soil

Nid Height

22
       
Seasonal Comparison

Weather Forecast

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Nearby Streamflow Levels

John ArambelBIG SANDY RIVER NEAR FARSON Preview Big Sandy River Near Farson
12.7cfs
13cfs
John ArambelPACIFIC CREEK NEAR FARSON Preview Pacific Creek Near Farson
2.69cfs
3cfs
John ArambelNEW FORK RIVER NEAR BIG PINEY Preview New Fork River Near Big Piney
295.0cfs
295cfs
John ArambelGREEN RIVER BELOW FONTENELLE RESERVOIR Preview Green River Below Fontenelle Reservoir
852.0cfs
852cfs
John ArambelGREEN RIVER NEAR LA BARGE Preview Green River Near La Barge
746.0cfs
746cfs
John ArambelFONTENELLE C NR HERSCHLER RANCH Preview Fontenelle C Nr Herschler Ranch
33.4cfs
33cfs

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