Em Johnson Alum Sludge Lagoon Dam
Em Johnson Alum Sludge Lagoon Dam is an earth dam located in Wake County, North Carolina, built in 1994. It carries a High hazard potential classification and has a fair condition assessment.
About Em Johnson Alum Sludge Lagoon Dam
Em Johnson Alum Sludge Lagoon Dam is a dam in Wake, North Carolina. The dam is owned by City Of Raleigh Public Utilities Department (private). It impounds the Honeycutt Creek near Raleigh.
The dam stands 41 feet tall and stretches 1,600 feet across, creates a reservoir covering 6 acres, has a maximum storage capacity of 108 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1994, the structure is 32 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 fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. An emergency action plan is in place for this dam. The most recent inspection on record was 12/05/2024.
At 41 feet, this dam is taller than 88% 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 North Carolina 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 | North Carolina |
| County | Wake |
| Nearest City | Raleigh |
| River/Stream | Honeycutt Creek |
| Coordinates | 35.91580, -78.60350 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 41 ft |
| Dam Length | 1,600 ft |
| Year Completed | 1994 (32 years old) |
Storage & Hydraulics
| NID Storage | 108 acre-ft |
| Max Storage | 108 acre-ft |
| Normal Storage | 90 acre-ft |
| Surface Area | 6 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 190 cfs |
Ownership & Safety
| Purpose | Other |
| Owner | City of Raleigh Public Utilities Department |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Fair |
| Last Inspection | 12/05/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NC04460 |
| Federal ID | NC04460 |
| More Info | State Dam Safety Program |