Salt Lake County Upper I-9 is an earth dam located in Salt Lake County, Utah, built in 1990. It carries a Significant hazard potential classification.
Dam profile
NID height · 6 ft6 ft tall and 2,100 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Salt Lake County Upper I-9
The primary purpose of Salt Lake County Upper I-9 is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by Salt Lake County Public Works (private). It impounds the Off Channel Site near Holladay.
The dam stands 6 feet tall and stretches 2,100 feet across, and has a maximum storage capacity of 35 acre-feet. Completed in 1990, the structure is 36 years old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. The most recent inspection on record was 05/21/2003. That was over 23 years ago.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Utah |
| County | Salt Lake |
| Nearest City | Holladay |
| River/Stream | Off Channel Site |
| Coordinates | 40.67685, -111.84910 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 6 ft |
| Dam Length | 2,100 ft |
| Year Completed | 1990 (36 years old) |
Storage & Hydraulics
| NID Storage | 35 acre-ft |
| Max Storage | 35 acre-ft |
| Normal Storage | 17 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Salt Lake County Public Works |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 05/21/2003 |
| Emergency Action Plan | No |
Identifiers
| NID ID | UT00785 |
| Federal ID | UT00785 |
| More Info | State Dam Safety Program |