Salt Lake County Upper I-9 Reservoir Report

Last Updated: December 5, 2025

Salt Lake County Upper I-9 is a privately owned dam located in Holladay, Utah, with a primary purpose of flood risk reduction.


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Summary

Completed in 1990, this earth dam stands at 6 feet high with a hydraulic height of 3 feet and a length of 2100 feet. It has a storage capacity of 35 acre-feet, with a normal storage level of 17 acre-feet. The dam is regulated by the Utah Division of Water Rights, and inspections are conducted regularly to ensure its safety and compliance with state regulations.

The dam is classified as having a significant hazard potential, although its condition assessment is currently listed as "Not Rated." The last inspection was conducted in May 2003, with a frequency of every 2 years. While an Emergency Action Plan (EAP) has not been reported, the dam meets state permitting and enforcement requirements. With a prime location for flood risk reduction in Salt Lake County, this dam plays a crucial role in protecting the surrounding area from potential inundation events.

Overall, Salt Lake County Upper I-9 is an essential structure for managing flood risks in the region, with a focus on safety and compliance with state regulations. Its strategic location and storage capacity contribute to its effectiveness in mitigating potential flooding events in the area. As climate change continues to impact water resources, dams like Upper I-9 will play a vital role in safeguarding communities and infrastructure from the risks associated with extreme weather events.

Year Completed

1990

Dam Length

2100

River Or Stream

OFF CHANNEL SITE

Primary Dam Type

Earth

Hydraulic Height

3

Nid Storage

35

Structural Height

6

Hazard Potential

Significant

Nid Height

6
       
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.