Rongis Detention Dam Reservoir Report
Last Updated: January 11, 2026
Rongis Detention Dam, located in Fremont, Wyoming, is a federal-owned structure managed by the Bureau of Land Management.
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Summary
Built in 1952, this gravity dam serves multiple purposes including fire protection, stock watering, and small fish pond management. The dam's primary function is to protect the surrounding area from wildfires and provide essential water resources for livestock and local wildlife.
With a structural height of 29 feet and a hydraulic height of 22 feet, Rongis Detention Dam has a storage capacity of 970 acre-feet, with a maximum storage of 527 acre-feet. The dam's spillway, though uncontrolled, has a width of 3 feet. Despite its low hazard potential, the dam is currently in poor condition, highlighting the need for regular inspection and maintenance to ensure its continued effectiveness. The risk assessment for the dam is moderate, emphasizing the importance of implementing risk management measures to mitigate potential failures and ensure the safety of downstream communities.
Overall, Rongis Detention Dam plays a crucial role in water resource management in the region, providing vital support for firefighting efforts and livestock operations. As climate change continues to impact water availability and extreme weather events, the maintenance and monitoring of this dam are essential to safeguarding both the environment and local communities against potential risks and ensuring the sustainable use of water resources in the area.
Year Completed |
1952 |
Dam Length |
1686 |
River Or Stream |
LOGAN GULCH |
Primary Dam Type |
Gravity |
Surface Area |
78 |
Hydraulic Height |
22 |
Nid Storage |
970 |
Structural Height |
29 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
29 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo 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
HighDams 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.
Rongis Detention Dam