Fubar Detention Dam Reservoir Report

Last Updated: December 5, 2025

Located in Ralston, Wyoming, the Fubar Detention Dam, also known as Lower Sand Coulee Reservoir, serves as a crucial infrastructure for debris control in the area.


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Summary

Managed by the Bureau of Land Management, this gravity dam stands at a structural height of 44 feet and has a hydraulic height of 40 feet. With a storage capacity of 490.7 acre-feet, the dam plays a significant role in managing water resources in the region.

The Fubar Detention Dam is state-regulated and inspected regularly to ensure its structural integrity and safety. Although classified as having a low hazard potential, it is considered to have a moderate risk level. The dam's primary purpose is debris control, and it features an uncontrolled spillway with a width of 3 feet. With a drainage area of 3.3 square miles, the dam provides vital flood protection and water storage for the surrounding area.

Water resource and climate enthusiasts can appreciate the Fubar Detention Dam for its role in managing water flow and ensuring the safety of the community. As a federal-owned structure, it exemplifies the collaborative efforts between government agencies to safeguard water resources and mitigate risks associated with natural disasters. The dam's strategic location and design make it a key asset in the region's water management infrastructure, showcasing the importance of sustainable water resource management in the face of changing climate conditions.

Dam Length

562

River Or Stream

unknown

Primary Dam Type

Gravity

Surface Area

59.7

Hydraulic Height

40

Drainage Area

3.3

Nid Storage

490.7

Structural Height

44

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

44
       
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.