Lone Tree Reservoir Report
Nearby: Sportsman Lake Lone Tree No. 2
Last Updated: December 5, 2025
Lone Tree is a private irrigation dam located on Lone Tree Creek in Laramie, Wyoming.
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Summary
Built in 1947, this earth dam stands at 35 feet high and has a storage capacity of 728 acre-feet. The dam serves the primary purpose of irrigation and is regulated by the Wyoming State Engineer's Office, with state permitting, inspection, and enforcement in place.
Despite its low hazard potential, the dam's condition assessment is rated as poor, indicating maintenance or repair needs. The spillway type is uncontrolled, with a width of 45 feet, and the outlet gates consist of a single slide (sluice gate). The last inspection date was in July 2021, with a scheduled inspection frequency of 5 years. While the risk assessment is moderate (level 3), there is currently no Emergency Action Plan (EAP) in place, and the dam's risk management measures are not specified in the data.
Overall, Lone Tree is a significant irrigation structure in the region, but its poor condition assessment and moderate risk level suggest a need for proactive maintenance and risk management measures to ensure the safety and effectiveness of this vital water resource infrastructure in the face of changing climate conditions. Climate and water resource enthusiasts may find this data intriguing for further analysis and discussions on sustainable water management practices.
Year Completed |
1947 |
Dam Length |
408 |
Dam Height |
35 |
River Or Stream |
LONE TREE CREEK |
Primary Dam Type |
Earth |
Surface Area |
48 |
Hydraulic Height |
30 |
Nid Storage |
728 |
Structural Height |
35 |
Outlet Gates |
Slide (sluice gate) - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
35 |
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.
Lone Tree