O Bar O No. 3 Reservoir Report
Last Updated: December 5, 2025
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Summary
3 is a privately owned earth dam located in Torrington, Wyoming, with a primary purpose of irrigation. Completed in 1970, this structure stands at 33 feet high and 360 feet long, with a storage capacity of 182 acre-feet. Situated on Grays Run and Sybille Creek offstream, this dam serves multiple purposes including fire protection, stock watering, and small fish pond management. Despite being classified as having a low hazard potential, the dam is regularly inspected and maintained to ensure its fair condition.
Managed by the Wyoming State Engineer's Office, O Bar O No. 3 is equipped with an uncontrolled spillway and outlet gates. The dam's risk assessment has been rated as moderate, indicating the need for ongoing risk management measures. With Liz Cheney representing Congressional District 00 in Wyoming, this structure plays a crucial role in enhancing water resource management and climate resilience in the Platte County area. Water resource and climate enthusiasts will find O Bar O No. 3 to be an intriguing example of sustainable infrastructure supporting agricultural activities in the region.
Year Completed |
1970 |
Dam Length |
360 |
Dam Height |
33 |
River Or Stream |
GRAYS RUN, SYBILLE CRK OFFSTRM |
Primary Dam Type |
Earth |
Surface Area |
11 |
Hydraulic Height |
28 |
Nid Storage |
182 |
Structural Height |
33 |
Outlet Gates |
Uncontrolled - 0 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
33 |
Seasonal Comparison
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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.
O Bar O No. 3