Lone Pine Reservoir Report

Last Updated: December 5, 2025

Lone Pine, located in Larimer County, Colorado, is a privately owned dam on Lone Pine Creek with a primary purpose of recreation.


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Summary

Built in 1979, this earth dam stands at 39 feet high with a hydraulic height of 34 feet and a structural height of 48 feet. The dam has a storage capacity of 146 acre-feet and a surface area of 9 acres, serving the community for fish and wildlife pond activities as well as recreational opportunities.

With a low hazard potential and a satisfactory condition assessment, Lone Pine offers a safe environment for visitors to enjoy the surrounding natural beauty. The dam features an uncontrolled spillway with a width of 50 feet and a maximum discharge capacity of 1716 cubic feet per second. The inspection frequency for Lone Pine is every 6 years, with the last assessment conducted in August 2018.

Managed by the Colorado Department of Water Resources, Lone Pine is a vital structure for water resource management in the area. Its location in Fort Collins, along with its moderate risk assessment rating, highlights the importance of monitoring and maintaining this dam to ensure the safety and well-being of the community and the environment.

Year Completed

1979

Dam Length

250

Dam Height

39

River Or Stream

LONE PINE CREEK

Primary Dam Type

Earth

Surface Area

9

Hydraulic Height

34

Drainage Area

60

Nid Storage

146

Structural Height

48

Hazard Potential

Low

Foundations

Rock, Soil

Nid Height

48
       
Seasonal Comparison

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Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.