Upper Mulberry River Ws Str. # 11
Upper Mulberry River Ws Str. # 11 is an earth dam located in Gwinnett County, Georgia, built in 1970. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Upper Mulberry River Ws Str. # 11
The primary purpose of Upper Mulberry River Ws Str. # 11 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 Gwinnett County S&wcd Gwinnett County Board Of Commissioners (state). It impounds the Little Mulberry River near Merrett.
The dam stands 46 feet tall and stretches 740 feet across, creates a reservoir covering 45 acres, has a maximum storage capacity of 3,890 acre-feet, and collects water from a drainage area of 4,105 square miles. Completed in 1970, 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 03/09/2017. That was 9 years ago, which is on the longer end for a high-hazard structure.
At 46 feet, this dam is taller than 91% of dams nationwide.
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 Georgia 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 | Georgia |
| County | Gwinnett |
| Nearest City | Merrett |
| River/Stream | Little Mulberry River |
| Coordinates | 34.05364, -83.87808 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 46 ft |
| Dam Height | 46 ft |
| Dam Length | 740 ft |
| Year Completed | 1970 (56 years old) |
Storage & Hydraulics
| NID Storage | 3,890 acre-ft |
| Max Storage | 3,890 acre-ft |
| Surface Area | 45 acres |
| Drainage Area | 4,105 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Gwinnett County S&WCD Gwinnett County Board of Commissioners |
| Owner Type | State |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 03/09/2017 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | GA01906 |
| Federal ID | GA01906 |
| More Info | State Dam Safety Program |