Pfister No. 2 Reservoir Report
Nearby: Wallace No. 2 Stockwater
Last Updated: December 6, 2025
Pfister No.
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Summary
2 is a privately owned earth dam located in Niobrara, Wyoming, on Oat Creek. Built in 1952 for irrigation purposes, this dam stands at 22 feet high with a hydraulic height of 17 feet and a length of 1076 feet. With a normal storage capacity of 109 acre-feet and a maximum storage of 209 acre-feet, Pfister No. 2 serves as a crucial water resource for the surrounding area.
Despite being classified as having a low hazard potential and fair condition assessment, Pfister No. 2 undergoes regular inspections and maintenance to ensure its continued safety and functionality. The dam features a slide (sluice gate) outlet gate and an uncontrolled spillway with a width of 100 feet. With a drainage area of 4.2 square miles and a surface area of 19.13 acres, this dam plays a vital role in providing water for irrigation, fire protection, stock, and small fish ponds in the region.
Located in Congressional District 00, Wyoming, Pfister No. 2 is subject to state regulation and oversight by the State Engineer's Office. The dam is situated in a picturesque area near Edgemont, SD, and continues to support the local ecosystem and economy through its water storage and distribution capabilities. For water resource and climate enthusiasts, Pfister No. 2 represents a significant infrastructure project that highlights the importance of sustainable water management practices in the face of changing climate conditions.
Year Completed |
1952 |
Dam Length |
1076 |
Dam Height |
22 |
River Or Stream |
OAT CREEK |
Primary Dam Type |
Earth |
Surface Area |
19.13 |
Hydraulic Height |
17 |
Drainage Area |
4.2 |
Nid Storage |
209 |
Structural Height |
22 |
Outlet Gates |
Slide (sluice gate) - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
22 |
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.
Pfister No. 2