Lake George Reservoir Report

Last Updated: December 5, 2025

Lake George, also known as Lidderdale, is a privately owned reservoir located in Park County, Colorado.


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Summary

Managed by the state regulatory agency DWR, this dam was completed in 1909 and primarily serves as a recreational area for water enthusiasts. With a dam height of 18 feet and a maximum storage capacity of 610 acre-feet, Lake George covers a surface area of 53 acres and is fed by the South Platte River.

The dam's spillway type is uncontrolled, with a spillway width of 100 feet, and it boasts a single slide (sluice gate) outlet gate. The hazard potential of Lake George is considered significant, but its condition assessment is rated as satisfactory. The reservoir's risk assessment is categorized as moderate, with a moderate risk management measure in place. Despite its age, Lake George continues to attract visitors seeking recreational activities in its scenic surroundings, making it a popular destination for water resource and climate enthusiasts interested in exploring Colorado's natural beauty.

Overall, Lake George offers a picturesque setting for outdoor activities such as fishing, boating, and hiking, while also serving as a vital water resource in the region. The dam's historic significance, combined with its modern-day recreational appeal, makes it a must-visit destination for those passionate about water conservation and environmental sustainability.

Year Completed

1909

Dam Length

1400

Dam Height

18

River Or Stream

SO PLATTE RIVER-OS

Primary Dam Type

Earth

Surface Area

53

Hydraulic Height

14

Nid Storage

610

Structural Height

19

Outlet Gates

Slide (sluice gate) - 1

Hazard Potential

Significant

Nid Height

19
       
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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.