Robinson Reservoir Report
Nearby: North Prong No. 1 T55nr76w31sese
Last Updated: December 5, 2025
Robinson is a privately owned dam located in Sheridan, Wyoming, along the Robinson Draw river or stream.
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Summary
Completed in 1956, this earth dam serves multiple purposes including fire protection, stock watering, and small fish pond management. With a maximum storage capacity of 104 acre-feet and a normal storage of 62 acre-feet, this structure plays a vital role in the local water resource management.
The dam stands at a height of 25 feet with a hydraulic height of 20 feet and a structural height of 28 feet. It spans a length of 305 feet and has a surface area of 7 acres. The spillway, classified as uncontrolled, has a width of 130 feet. Despite being classified as low hazard potential, Robinson received a fair condition assessment during its last inspection in August 2021, with a moderate risk assessment rating. The dam is not operated by the US Army Corps of Engineers and has no associated locks or outlet gates.
With a history dating back to the mid-20th century, Robinson continues to be a key component of the local water infrastructure, providing essential services for fire protection and agricultural needs. Its location in Powder River County, Wyoming, highlights its significance in the region's water resource management. Monitoring and maintenance efforts are in place to ensure the dam's continued functionality and safety for the surrounding community.
Year Completed |
1956 |
Dam Length |
305 |
Dam Height |
25 |
River Or Stream |
ROBINSON DRAW |
Primary Dam Type |
Earth |
Surface Area |
7 |
Hydraulic Height |
20 |
Nid Storage |
104 |
Structural Height |
28 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
28 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Powder River At Arvada
|
156cfs |
Wild Horse Creek Near Arvada
|
0cfs |
Clear Creek Near Arvada
|
256cfs |
Powder River At Moorhead Mt
|
60cfs |
Piney Creek At Kearny
|
113cfs |
Little Powder River Ab Dry Creek
|
1cfs |
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.
Robinson