Phil No. 1 Reservoir Report
Nearby: Bradley Wildcat No. 2
Last Updated: December 13, 2025
Phil No.
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Summary
1 is a privately owned dam located in Niobrara, Wyoming, specifically in the city of EDGEMONT S D. Completed in 1966, this earthen dam serves multiple purposes including fire protection, stock watering, and as a small fish pond. With a structural height of 35 feet and a hydraulic height of 30 feet, this dam has a storage capacity of 83 acre-feet and covers a surface area of 5 acres. The dam is situated on the Phil Draw river and is regulated by the State of Wyoming, with inspections conducted every 5 years to ensure its fair condition and low hazard potential.
Managed by the Wyoming State Energy Office, Phil No. 1 features an uncontrolled spillway with a width of 50 feet and an outlet gate for water release. The dam is designed to handle a maximum discharge of 0 cubic feet per second and has a drainage area of 0 square miles. The risk assessment for this structure is rated as moderate (3), indicating a need for ongoing monitoring and risk management measures. The dam is located in Congressional District 00, Wyoming, represented by Liz Cheney (R), and falls under the jurisdiction of the Omaha District of the US Army Corps of Engineers.
Overall, Phil No. 1 is a vital water resource in Wyoming, providing essential services for fire protection, livestock watering, and recreational fishing. With its fair condition and low hazard potential, this dam plays a crucial role in the local ecosystem and contributes to the sustainable management of water resources in the region. Ongoing inspections and risk assessments ensure the safety and functionality of this structure for the benefit of the surrounding community and the environment.
Year Completed |
1966 |
Dam Length |
358 |
Dam Height |
36 |
River Or Stream |
PHIL DRAW |
Primary Dam Type |
Earth |
Surface Area |
5 |
Hydraulic Height |
30 |
Nid Storage |
83 |
Structural Height |
35 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
36 |
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.
Phil No. 1