Moslander Reservoir Report

Last Updated: December 4, 2025

Moslander is a privately owned irrigation dam located in Piedmont, Wyoming, along Big Muddy Creek in Summit, Utah.


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Summary

Built in 1882, this Earth dam stands at a structural height of 14 feet and has a hydraulic height of 10 feet. With a storage capacity of 85 acre-feet, Moslander serves the primary purpose of irrigation in the region. Despite its age, the dam has a low hazard potential and has not been rated for its condition.

Managed by the Utah Division of Water Rights, Moslander is subject to state regulation, permitting, inspection, and enforcement. The last inspection of the dam took place in August 2004, with an inspection frequency of every five years. While there are no associated structures or spillways, Moslander is equipped to handle the normal storage of 75 acre-feet. Its location in a remote area and its historical significance make it an intriguing site for water resource and climate enthusiasts to explore.

With its rich history dating back to the late 19th century, Moslander remains a vital part of the irrigation infrastructure in Utah. Its construction marked a significant development in water management in the region, and its continued operation underscores the importance of maintaining and inspecting aging dams for safety and efficiency. As climate change poses challenges to water resources, Moslander stands as a reminder of the critical role that dams play in supporting agriculture and water supply in the arid western landscapes.

Year Completed

1882

Dam Length

150

River Or Stream

BIG MUDDY CREEK

Primary Dam Type

Earth

Hydraulic Height

10

Nid Storage

85

Structural Height

14

Hazard Potential

Low

Nid Height

14
       
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.