Zezas Reservoir Report
Nearby: Zezas Irrigation Zezas No. 1
Last Updated: December 13, 2025
Zezas is a privately owned earth dam located in Johnson, Wyoming, with a primary purpose of fire protection, stock, or small fish pond.
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Summary
Built in 1958, this dam stands at 25 feet high and spans 335 feet in length, with a storage capacity of 128 acre-feet. The dam is regulated by the State of Wyoming and undergoes regular inspections, with the last assessment conducted in April 2020 revealing a poor condition assessment. Despite its low hazard potential, the risk assessment for Zezas is moderate, indicating the need for continued monitoring and risk management measures.
Situated on the Road Draw tributary of the Crazy Woman Creek, Zezas serves as a vital water resource for the surrounding area. While it currently operates with an uncontrolled spillway and no outlet gates, the dam provides essential water storage for fire protection and livestock needs. The dam's surface area of 11 acres and normal storage of 73 acre-feet contribute to its significance in the local ecosystem. With Liz Cheney representing Congressional District 00 in Wyoming, Zezas remains an important structure for water management and conservation efforts in the region.
Despite its age and poor condition assessment, Zezas continues to play a crucial role in water resource management in Johnson, Wyoming. As climate change poses increasing challenges to water availability and quality, maintaining and potentially upgrading dams like Zezas will be essential for ensuring sustainable water access for both human and environmental needs. With its moderate risk assessment, Zezas highlights the importance of proactive risk management strategies to safeguard water resources in the face of evolving climatic conditions.
Year Completed |
1958 |
Dam Length |
335 |
Dam Height |
25 |
River Or Stream |
ROAD DRAW, TRIB CRAZY WOMAN CR |
Primary Dam Type |
Earth |
Surface Area |
11 |
Hydraulic Height |
20 |
Nid Storage |
128 |
Structural Height |
25 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
25 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Nf Powder River Below Pass Creek
|
50cfs |
Clear Creek Near Buffalo
|
30cfs |
North Fork Powder River Near Hazelton
|
3cfs |
Rock Creek Near Buffalo
|
70cfs |
Powder River At Sussex
|
144cfs |
Piney Creek At Kearny
|
113cfs |
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.
Zezas