Swan Reservoir Report

Last Updated: December 5, 2025

Swan is a privately owned earth dam located in Laramie, Wyoming, near the city of Cheyenne.


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Summary

Built in 1907 for irrigation purposes, Swan stands at a height of 25 feet and has a storage capacity of 356 acre-feet. The dam spans 1450 feet in length and is situated on Clear Creek, with a drainage area of 11.6 square miles.

Despite its age, Swan has been maintained and regulated by the Wyoming State Engineer's Office, with regular inspections and enforcement measures in place. However, the dam is classified as having a significant hazard potential and is currently in poor condition, highlighting the need for ongoing risk management and potential rehabilitation efforts to ensure the safety and integrity of the structure.

With a spillway width of 150 feet and a maximum discharge capacity of 72 cubic feet per second, Swan is a vital water resource for the region. Its location within Congressional District 00, Wyoming, under the oversight of the Omaha District of the US Army Corps of Engineers, underscores its importance in water management and climate resilience efforts in the area.

Year Completed

1907

Dam Length

1450

Dam Height

25

River Or Stream

CLEAR CREEK

Primary Dam Type

Earth

Surface Area

35

Hydraulic Height

20

Drainage Area

11.6

Nid Storage

356

Structural Height

25

Outlet Gates

Valve - 1

Hazard Potential

Significant

Foundations

Soil

Nid Height

25
       
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.