Sundby Reservoir Report

Last Updated: December 5, 2025

Sundby is a privately owned irrigation dam located in Laramie, Wyoming, along Hecht Creek.


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Summary

Built in 1945, this earth dam stands at 21 feet tall and has a storage capacity of 119 acre-feet. Despite its low hazard potential, the dam is currently in poor condition as of the last inspection in July 2019. The spillway is uncontrolled with a width of 25 feet, and the outlet is equipped with a single valve.

With a moderate risk assessment rating of 3, Sundby is facing challenges due to its poor condition and lack of recent updates or improvements. The dam's emergency action plan (EAP) status and risk management measures are unclear, raising concerns about its ability to withstand potential emergencies or natural disasters. As water resource and climate enthusiasts, it is crucial to monitor and address the maintenance and safety of Sundby to ensure the protection of surrounding areas and the efficient management of water resources in the region.

Year Completed

1945

Dam Length

685

Dam Height

21

River Or Stream

HECHT CREEK

Primary Dam Type

Earth

Surface Area

10

Hydraulic Height

16

Nid Storage

119

Structural Height

21

Outlet Gates

Valve - 1

Hazard Potential

Low

Foundations

Soil

Nid Height

21
       
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.