Three T No 1 Dam Reservoir Report
Nearby: Cloud Creek No. 3 Bear Dam
Last Updated: December 13, 2025
Three T No 1 Dam, located in Natrona, Wyoming, is a federal-owned structure managed by the Bureau of Land Management.
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Summary
Built in 1960, this gravity dam stands at a hydraulic height of 21 feet and a structural height of 23 feet, with a length of 727 feet. It serves a primary purpose of "Other" and has a storage capacity of 204.12 acre-feet, with a normal storage level of 122 acre-feet.
While the dam is classified as having a low hazard potential, its condition assessment is rated as poor, indicating a need for maintenance and potential upgrades to ensure its structural integrity and safety. The risk assessment for Three T No 1 Dam is moderate, highlighting the importance of ongoing monitoring and risk management measures. Despite its current condition, the dam continues to regulate the flow of the Unnamed Draw river and play a crucial role in water resource management in the area.
With its unique design features and historical significance, Three T No 1 Dam remains a key component of water infrastructure in Wyoming. As climate change impacts water resources and infrastructure, the importance of maintaining and improving dams like Three T No 1 Dam becomes increasingly vital to ensure the sustainability and resilience of water systems in the face of evolving environmental challenges.
Year Completed |
1960 |
Dam Length |
727 |
River Or Stream |
UNAMED DRAW |
Primary Dam Type |
Gravity |
Surface Area |
24.3 |
Hydraulic Height |
21 |
Drainage Area |
3.75 |
Nid Storage |
204.12 |
Structural Height |
23 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
23 |
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.
Three T No 1 Dam