A-3 Detention Reservoir Report
Nearby: H-2 Detention H-1 Detention
Last Updated: December 5, 2025
A-3 Detention, also known as Angell Draw, is a privately owned earth dam located in Lingle, Wyoming, in Goshen County.
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Summary
Completed in 1969, this structure primarily serves the purpose of flood risk reduction along the Angell Draw river. With a maximum storage capacity of 1334 acre-feet and a normal storage capacity of 800 acre-feet, A-3 Detention covers a surface area of 89 acres and has a drainage area of 5.1 square miles.
Standing at a height of 30 feet with a hydraulic height of 24 feet, A-3 Detention spans a length of 2650 feet and features a spillway width of 800 feet. The dam's low hazard potential and fair condition assessment suggest that it is currently in good operational shape. The last inspection in June 2017 deemed it to be in fair condition, with an inspection frequency of every 5 years. Overall, A-3 Detention plays a critical role in mitigating flood risks in the area, showcasing effective engineering and maintenance practices for water resource and climate enthusiasts to appreciate.
Year Completed |
1969 |
Dam Length |
2650 |
Dam Height |
30 |
River Or Stream |
ANGELL DRAW |
Primary Dam Type |
Earth |
Surface Area |
89 |
Hydraulic Height |
24 |
Drainage Area |
5.1 |
Nid Storage |
1334 |
Structural Height |
30 |
Outlet Gates |
Other Controlled - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
30 |
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.
A-3 Detention