Grantsville
Grantsville is an earth dam located in Tooele County, Utah, built in 1984. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Grantsville
The primary purpose of Grantsville is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Grantsville Irrigation Company (private). It impounds the So Willow, No Willow, Et Al near Grantsville.
The dam stands 82 feet tall and stretches 5,376 feet across, has a maximum storage capacity of 3,885 acre-feet, and collects water from a drainage area of 3 square miles. Completed in 1984, the structure is 42 years old.
This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 07/18/2023.
At 82 feet, this dam is taller than 97% of all dams in the United States.
Living Downstream
If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The Utah dam safety program can provide more specific information about emergency planning for this structure.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Utah |
| County | Tooele |
| Nearest City | Grantsville |
| River/Stream | So Willow, No Willow, Et Al |
| Coordinates | 40.54684, -112.50246 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 82 ft |
| Dam Length | 5,376 ft |
| Year Completed | 1984 (42 years old) |
Storage & Hydraulics
| NID Storage | 3,885 acre-ft |
| Max Storage | 3,885 acre-ft |
| Normal Storage | 3,370 acre-ft |
| Drainage Area | 3 sq mi |
| Max Discharge | 159 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | GRANTSVILLE IRRIGATION COMPANY |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 07/18/2023 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | UT00343 |
| Federal ID | UT00343 |
| More Info | State Dam Safety Program |