Elsie Reservoir Report

Last Updated: December 5, 2025

Elsie is a privately owned Earth dam located in Converse, Wyoming, specifically in the city of Douglas along Moss Agate Creek.


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Summary

Completed in 1975, this irrigation dam stands at a height of 39 feet with a hydraulic height of 34 feet and a length of 328 feet. It has a storage capacity of 51 acre-feet and serves the purpose of irrigation for the surrounding area.

Despite its significant hazard potential and poor condition assessment, Elsie has a moderate risk assessment rating of 3. The dam features an uncontrolled spillway with a width of 30 feet and an outlet gate consisting of one valve. The last inspection was conducted in October 2018, with an inspection frequency of 5 years. Elsie is regulated by the State Engineer's Office and is subject to permitting, inspection, and enforcement by the state regulatory agency.

Elsie's location in the Omaha District and its association with the USACE (U.S. Army Corps of Engineers) make it a crucial water resource for the region. Enthusiasts interested in water resource management and climate impacts on dams would find Elsie's structural details and operational aspects intriguing, especially considering its importance for irrigation purposes in the area.

Year Completed

1975

Dam Length

328

Dam Height

39

River Or Stream

MOSS AGATE CREEK

Primary Dam Type

Earth

Surface Area

6

Hydraulic Height

34

Drainage Area

2.2

Nid Storage

51

Structural Height

39

Outlet Gates

Valve - 1

Hazard Potential

Significant

Foundations

Soil

Nid Height

39
       
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.