Fremont Lake Reservoir Report

Last Updated: December 5, 2025

Fremont Lake, located in Sublette, Wyoming, is a picturesque reservoir with a primary purpose of irrigation.


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Summary

Built in 1993, the concrete dam stands at a height of 10 feet and has a hydraulic height of 7 feet, providing a storage capacity of 30,899 acre-feet. The lake covers a surface area of 5,400 acres and is fed by Pine Creek, offering a vital water source for the surrounding area.

Managed by the local government, Fremont Lake is regulated and inspected by the Wyoming State Engineer's Office to ensure its safety and compliance with state regulations. Despite its fair condition assessment and low hazard potential, the risk assessment for the dam is categorized as very high, indicating the need for vigilant monitoring and risk management measures. The dam's controlled spillway, with a width of 84 feet, helps to manage water levels during peak discharge events, further highlighting the importance of this water resource in the region.

With its significant storage capacity and role in irrigation, Fremont Lake serves as a crucial resource for water supply and supports fish and wildlife in the area. As climate change continues to impact water resources, the management and maintenance of dams like Fremont Lake become increasingly important to ensure sustainable water use and resilience in the face of changing environmental conditions.

Year Completed

1993

Dam Length

230

Dam Height

10

River Or Stream

PINE CREEK

Primary Dam Type

Concrete

Surface Area

5400

Hydraulic Height

7

Drainage Area

96.2

Nid Storage

30899

Structural Height

15

Outlet Gates

Slide (sluice gate) - 5

Hazard Potential

Low

Foundations

Soil

Nid Height

15
       
Seasonal Comparison

Weather Forecast

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.