Cody Sewage Lagoon (Cell 1) Reservoir Report
Nearby: Cody Sewage Lagoon (Cell 2) Beck Lake
Last Updated: December 5, 2025
Located in Cody, Wyoming, the Cody Sewage Lagoon (Cell 1) is a vital water resource managed by the local government.
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Summary
Designed by Robert L. Jacobson, this sewage lagoon plays a crucial role in treating wastewater from the city before it is discharged into the Shoshone River. Completed in 1987, this Earth dam structure stands at a height of 15 feet and has a storage capacity of 76 acre-feet.
Despite being classified as having a low hazard potential, the Cody Sewage Lagoon is subject to regular inspections and enforcement by the Wyoming State Engineer's Office. The dam is equipped with 12 valve outlet gates and is in fair condition as of the last assessment in June 2018. With a risk assessment rating of High (2), it is clear that proactive risk management measures are in place to ensure the safety and integrity of this essential water infrastructure.
As a key component of the local water management system, the Cody Sewage Lagoon (Cell 1) serves as a crucial facility for treating and storing wastewater in Cody. With its strategic location near the Shoshone River and compliance with state regulations, this sewage lagoon plays a vital role in protecting the water quality of the region. Despite being in fair condition, ongoing monitoring and maintenance efforts are essential to ensure the long-term viability of this important water resource in Wyoming.
Year Completed |
1987 |
Dam Length |
2320 |
Dam Height |
15 |
River Or Stream |
SHOSHONE RIVER |
Primary Dam Type |
Earth |
Surface Area |
23 |
Hydraulic Height |
12 |
Nid Storage |
76 |
Structural Height |
15 |
Outlet Gates |
Valve - 12 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
15 |
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.
Cody Sewage Lagoon (Cell 1)