Mantua
Mantua is an earth dam located in Box Elder County, Utah, built in 1961. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Mantua
The primary purpose of Mantua is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Brigham City (local government). It impounds the Big Creek near Mantua.
The dam stands 29 feet tall and stretches 11,140 feet across, has a maximum storage capacity of 10,450 acre-feet, and collects water from a drainage area of 9 square miles. Completed in 1961, the structure is well into its service life at over 50 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 08/15/2023.
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 | Box Elder |
| Nearest City | Mantua |
| River/Stream | Big Creek |
| Coordinates | 41.50352, -111.94245 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 29 ft |
| Dam Length | 11,140 ft |
| Year Completed | 1961 (65 years old) |
Storage & Hydraulics
| NID Storage | 10,450 acre-ft |
| Max Storage | 10,450 acre-ft |
| Normal Storage | 7,560 acre-ft |
| Drainage Area | 9 sq mi |
| Max Discharge | 122 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | BRIGHAM CITY |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 08/15/2023 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | UT00196 |
| Federal ID | UT00196 |
| More Info | State Dam Safety Program |