Pine Dale Reservoir Report
Nearby: Artesian Upper Artesian Lower
Last Updated: December 8, 2025
Located in Johnson, Wyoming, the Pine Dale dam on the Dry Fork of Powder River serves multiple purposes including fire protection, stock, and small fish pond management.
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Summary
Constructed in 1940, this earth dam stands at a height of 15 feet with a hydraulic height of 10 feet and a length of 778 feet. With a storage capacity of 122 acre-feet, the dam provides essential water resources for the region while also offering recreational opportunities with its 10-acre surface area.
Despite its low hazard potential, the Pine Dale dam is in poor condition as of the last inspection in May 2018. The dam's spillway, an uncontrolled type with a width of 150 feet, poses a moderate risk of failure. With a history of valve-based outlet gates and a drainage area of zero, the dam requires regular inspection and maintenance to ensure its continued safety and functionality. As climate change impacts water resources, the management and upkeep of dams like Pine Dale become increasingly important for both water security and environmental resilience.
Year Completed |
1940 |
Dam Length |
778 |
Dam Height |
15 |
River Or Stream |
DRY FORK OF POWDER RIVER |
Primary Dam Type |
Earth |
Surface Area |
10 |
Hydraulic Height |
10 |
Nid Storage |
122 |
Structural Height |
15 |
Outlet Gates |
Valve - 1 |
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.
Pine Dale