Lone Tree Reservoir Report
Nearby: Hauber 9-108-1 Davis
Last Updated: December 5, 2025
Lone Tree is a privately owned irrigation dam located on Lone Tree Creek in Campbell County, Wyoming.
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Summary
Built in 1906, this earth dam stands at a height of 14 feet and has a storage capacity of 237 acre-feet. Its primary purpose is for irrigation, with additional uses for fire protection, stock, or small fish pond. Despite being classified as having a low hazard potential, the dam's condition assessment in 2019 was reported as unsatisfactory, indicating a need for maintenance and upgrades to ensure its continued safety and functionality.
With a spillway width of 300 feet and an uncontrolled spillway type, Lone Tree Dam has a moderate risk assessment rating. The dam's inspection frequency is set at 5 years, with the last assessment conducted in July 2019. The dam's drainage area is listed as 0, indicating its reliance on water from Lone Tree Creek for storage and irrigation purposes. The dam is not under the jurisdiction of any federal agency, and its operations, inspections, and enforcement are managed by the state of Wyoming through the State Engineer's Office.
Lone Tree Dam, situated in the picturesque surroundings of Campbell County, plays a vital role in providing water for irrigation and other purposes in the region. Water resource and climate enthusiasts interested in the management and maintenance of dams will find Lone Tree's history, design features, and regulatory oversight to be intriguing aspects of this essential water infrastructure. As efforts continue to ensure the dam's safety and effectiveness, its significance in supporting agricultural activities and water supply in the area remains paramount.
Year Completed |
1906 |
Dam Length |
1359 |
Dam Height |
14 |
River Or Stream |
LONE TREE CREEK |
Primary Dam Type |
Earth |
Surface Area |
18 |
Hydraulic Height |
11 |
Nid Storage |
237 |
Structural Height |
14 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
14 |
Seasonal Comparison
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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.
Lone Tree