Amelia No. 1 Reservoir Report
Nearby: Clark No. 1 Story No. 1
Last Updated: December 6, 2025
Amelia No.
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Summary
1 is a privately owned dam located in Niobrara, Wyoming, along Alum Creek. Built in 1961, this Earth dam stands at a height of 24 feet and has a maximum storage capacity of 125 acre-feet. The primary purposes of this dam are for fire protection, stock watering, and as a small fish pond, serving the local community in Edgemont, SD.
Despite its low hazard potential and moderate risk assessment, Amelia No. 1 is currently in poor condition according to the last inspection conducted in May 2018. The dam features an uncontrolled spillway with a width of 275 feet and one other controlled outlet gate. With a drainage area of 15.8 square miles and a surface area of 10 acres, this dam plays a crucial role in managing water resources in the region.
For water resource and climate enthusiasts, Amelia No. 1 presents an intriguing case study of a privately owned dam that serves multiple purposes while facing maintenance challenges. Its location in a scenic area along Alum Creek adds to its significance, making it a focal point for water management discussions in Wyoming. As efforts continue to ensure its safety and functionality, Amelia No. 1 remains a key feature in the local water infrastructure landscape.
Year Completed |
1961 |
Dam Length |
460 |
Dam Height |
24 |
River Or Stream |
ALUM CREEK |
Primary Dam Type |
Earth |
Surface Area |
10 |
Hydraulic Height |
19 |
Drainage Area |
15.8 |
Nid Storage |
125 |
Structural Height |
29 |
Outlet Gates |
Other Controlled - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
29 |
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.
Amelia No. 1