Sinnard Reservoir Report
Nearby: Hughes Goshen No. 1
Last Updated: December 5, 2025
Sinnard dam, located in Goshen, Wyoming, was completed in 1935 and serves primarily for irrigation purposes along the Sinnard Draw river.
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Summary
The earth dam stands at a height of 26 feet with a hydraulic height of 21 feet, providing a storage capacity of 1,679 acre-feet and a normal storage of 1,358 acre-feet. The dam covers a surface area of 161 acres and has a spillway width of 100 feet.
Despite being categorized with a significant hazard potential, Sinnard dam is currently assessed as being in fair condition as of the last inspection in May 2017. It is regulated and inspected by the State of Wyoming, ensuring compliance with safety standards and enforcement measures. The dam poses a moderate risk, with risk management measures in place to mitigate any potential issues. For water resource and climate enthusiasts, Sinnard dam presents an interesting case study in the management and maintenance of irrigation infrastructure in the region.
Year Completed |
1935 |
Dam Length |
1350 |
Dam Height |
26 |
River Or Stream |
SINNARD DRAW |
Primary Dam Type |
Earth |
Surface Area |
161 |
Hydraulic Height |
21 |
Nid Storage |
1679 |
Structural Height |
26 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Significant |
Foundations |
Soil |
Nid Height |
26 |
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.
Sinnard