Pissolio No. 1 Reservoir Report
Nearby: Big Delaney V. E. Lissolo Irrigation
Last Updated: December 5, 2025
Pissolio No.
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Summary
1 is a historic earth dam located in Weston County, Wyoming, with a primary purpose of irrigation. Completed in 1909, this dam stands at 45 feet in height and stretches 280 feet in length, holding a storage capacity of 42 acre-feet. Situated on the Spring Draw river, this structure is regulated by the Wyoming State Engineer's Office and undergoes regular inspections and enforcement to ensure its integrity.
Despite its low hazard potential, Pissolio No. 1 has been assessed as being in poor condition as of the last inspection in May 2017. With an emergency action plan yet to be prepared, there is a moderate risk associated with this dam, prompting the need for risk management measures to be implemented. The surrounding area is at risk of inundation in the event of a failure, highlighting the importance of maintaining and upgrading this vital water resource infrastructure.
As water resource and climate enthusiasts, it is crucial to monitor the condition of structures like Pissolio No. 1 to ensure the safety and sustainability of our water supply. With its rich history and essential role in irrigation, efforts must be made to address the poor condition of this dam and implement necessary risk management measures to mitigate any potential hazards. By staying informed and proactive, we can safeguard our water resources for future generations.
Year Completed |
1909 |
Dam Length |
280 |
Dam Height |
45 |
River Or Stream |
SPRING DRAW |
Primary Dam Type |
Earth |
Surface Area |
4 |
Hydraulic Height |
45 |
Nid Storage |
42 |
Structural Height |
45 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
45 |
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.
Pissolio No. 1