Sandstone Reservoir Report
Nearby: West Enl. Dixon
Last Updated: December 15, 2025
Sandstone, located in Johnson County, Wyoming, is a federally owned earth dam completed in 1956 for fire protection, stock, and small fish pond purposes.
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Summary
The dam, standing at 39 feet tall with a hydraulic height of 34 feet, is situated along the Sandstone Draw river. With a storage capacity of 71 acre-feet, the dam covers a surface area of 5 acres and serves as a low hazard structure with a fair condition assessment.
Managed by the U.S. Army Corps of Engineers' Omaha District, Sandstone features an uncontrolled spillway with a width of 40 feet and no outlet gates. Despite its low hazard potential, the dam undergoes inspections every five years, with the last assessment conducted in May 2018. With its moderate risk assessment rating, Sandstone serves as a critical infrastructure for water resource management in the region, showcasing the importance of maintaining and monitoring such structures in the face of changing climate conditions.
Year Completed |
1956 |
Dam Length |
296 |
Dam Height |
39 |
River Or Stream |
SANDSTONE DRAW |
Primary Dam Type |
Earth |
Surface Area |
5 |
Hydraulic Height |
34 |
Nid Storage |
71 |
Structural Height |
39 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
39 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Clear Creek Near Buffalo
|
16cfs |
Powder River At Arvada
|
262cfs |
Wild Horse Creek Near Arvada
|
0cfs |
Piney Creek At Kearny
|
113cfs |
Rock Creek Near Buffalo
|
70cfs |
South Piney Creek At Willow Park
|
0cfs |
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.
Sandstone