US 78 over Chattahoochee River
GoodCobb County, Georgia · 6.1 MI S of Smyrna · Structure no. 000000006700340
- Built
- 1934
- 91 years old, rebuilt 1985
- Condition
- Good
- inspected October 2023
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 540 ft
- 9 main spans
- Daily traffic
- 26,200
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
US 78 over Chattahoochee River is a steel continuous stringer/multi-beam or girder carrying US 78 over Chattahoochee River in Cobb County, Georgia. It was built in 1934 and reconstructed in 1985, so it is 91 years old, older than the Georgia average of 47.5 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 26,200 vehicles a day, roughly 1% of them trucks, projected to reach 36,480 by 2032. The structure is 540 ft (164.6 m) long and 70 ft wide. If it were closed, the detour would be 6.2 mi (10 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US 78 over Chattahoochee River built?
It was built in 1934, making it 91 years old in 2025. It was reconstructed in 1985.
What condition is US 78 over Chattahoochee River in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2023.
How much traffic does US 78 over Chattahoochee River carry?
About 26,200 vehicles per day (2024 count), of which roughly 1% are trucks.
How long is US 78 over Chattahoochee River?
The structure is 540 ft (164.6 m) long with a longest span of 100 ft (30.5 m) and a deck 70 ft wide.
Who owns US 78 over Chattahoochee River?
It is owned by the State Highway Agency.