South Junction is an earth dam located in Box Elder County, Utah, built in 1958. It carries a Significant hazard potential classification.
Dam profile
NID height · 47 ft47 ft tall and 1,235 ft long, taller than 91% of U.S. dams with a recorded height. Height is drawn to scale against a ten-story building, about 100 ft; the profile is a generic embankment section and the water level is illustrative.
About South Junction
The primary purpose of South Junction is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by South Junction Creek Water (private). It impounds the South Junction Creek near Lynn.
The dam stands 47 feet tall and stretches 1,235 feet across, has a maximum storage capacity of 865 acre-feet, and collects water from a drainage area of 6 square miles. Completed in 1958, the structure is well into its service life at over 50 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 06/15/2023.
At 47 feet, this dam is taller than 91% of dams nationwide.
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 | Lynn |
| River/Stream | South Junction Creek |
| Coordinates | 41.84684, -113.71918 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 47 ft |
| Dam Length | 1,235 ft |
| Year Completed | 1958 (68 years old) |
Storage & Hydraulics
| NID Storage | 865 acre-ft |
| Max Storage | 865 acre-ft |
| Normal Storage | 865 acre-ft |
| Drainage Area | 6 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | South Junction Creek Water |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 06/15/2023 |
| Emergency Action Plan | No |
Identifiers
| NID ID | UT00285 |
| Federal ID | UT00285 |
| More Info | State Dam Safety Program |