Fly Ash Disposal Cell B Reservoir Report
Last Updated: December 15, 2025
Fly Ash Disposal Cell B, located in Sweetwater, Wyoming, is a privately owned structure designed by Western States Mining Consultants.
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Summary
This disposal cell, completed in 2003, serves a primary purpose other than water storage and is regulated by the Wyoming State Environmental Quality and Department of Environmental Quality agencies. The dam, primarily made of earth with a stone core, stands at a height of 16 feet and has a hydraulic height of 13 feet, with a storage capacity of 194 acre-feet.
Although Fly Ash Disposal Cell B has a low hazard potential, its condition assessment in 2019 was deemed fair. The structure does not have a spillway, but it does have one controlled outlet gate. The dam's location near Pond Draw and its association with General Chemical adds to its significance. Despite its risk assessment being high, with a DSAC assigned date unknown, the dam remains under regular inspection with a frequency of 5 years to ensure its integrity and safety. Overall, Fly Ash Disposal Cell B plays a crucial role in managing fly ash waste in a controlled and regulated manner in Wyoming.
Year Completed |
2003 |
Dam Length |
3300 |
Dam Height |
16 |
River Or Stream |
POND DRAW |
Primary Dam Type |
Earth |
Surface Area |
16 |
Hydraulic Height |
13 |
Drainage Area |
0.03 |
Nid Storage |
194 |
Structural Height |
16 |
Outlet Gates |
Other Controlled - 1 |
Hazard Potential |
Low |
Foundations |
Rock, Soil |
Nid Height |
16 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Blacks Fork Near Little America
|
14cfs |
Green River Near Green River
|
870cfs |
Green River Below Fontenelle Reservoir
|
852cfs |
Henrys Fork Near Manila
|
49cfs |
Pacific Creek Near Farson
|
3cfs |
Green River Near La Barge
|
681cfs |
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.
Fly Ash Disposal Cell B