Herman-Sadlier Reservoir Report

Last Updated: December 5, 2025

Herman-Sadlier is a private Earth dam located in Uintah, Utah, along the Ashley Creek.


°F

°F

mph

Wind

%

Humidity

Summary

Built in 1963 by the USDA NRCS, this dam serves the primary purpose of irrigation and is regulated by the Utah Division of Water Rights. With a hydraulic height of 25 feet and a structural height of 28 feet, Herman-Sadlier has a storage capacity of 76 acre-feet, with a normal storage of 60 acre-feet. The dam spans 780 feet in length and covers a drainage area of 1.9 square miles.

Despite its age, Herman-Sadlier has a low hazard potential and has not been rated for its condition. The dam was last inspected in July 2016 and is scheduled for inspection every five years. Emergency preparedness measures such as an Emergency Action Plan (EAP) and inundation maps are not currently in place for this structure. With its location in a critical water resource area and its importance for irrigation in the region, continued monitoring and maintenance of Herman-Sadlier are essential for the safety and sustainability of water resources in the surrounding area.

In the hands of private owners, Herman-Sadlier stands as a testament to the collaboration between federal and state agencies in managing water resources for agricultural purposes. With its historical significance and ongoing role in supporting local irrigation needs, this dam serves as a vital piece of infrastructure that requires continued attention and investment to ensure its functionality and safety for the community it serves.

Year Completed

1963

Dam Length

780

River Or Stream

ASHLEY CREEK

Primary Dam Type

Earth

Hydraulic Height

25

Drainage Area

1.9

Nid Storage

76

Structural Height

28

Hazard Potential

Low

Nid Height

28
       
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.