US Bridges

I-285 over NS Railroad

Good

Cobb County, Georgia · 4.7 MI SE of Smyrna · Structure no. 000000006700930

Built
1968
57 years old, rebuilt 1983
Condition
Good
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
156 ft
2 main spans
Daily traffic
150,000
2024 count
Owner
State
State Highway Agency

About this bridge

I-285 over NS Railroad is a steel stringer/multi-beam or girder carrying I-285 over NS Railroad in Cobb County, Georgia. It was built in 1968 and reconstructed in 1983, so it is 57 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 150,000 vehicles a day, roughly 1% of them trucks, projected to reach 202,965 by 2032. The structure is 156 ft (47.5 m) long and 134 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesI-285
CrossesNS Railroad
Location4.7 MI SE of Smyrna
RouteInterstate 285
StateGeorgia
Coordinates33.81917, -84.495
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating31 US tons
Inventory rating18 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length156 ft (47.5 m)
Longest span100 ft (30.5 m)
Deck width134 ft (40.9 m)
Roadway width128 ft (39.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic150,000 (2024)
Projected traffic202,965 by 2032
Trucks1%
Lanes on structure8
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-285 over NS Railroad built?

It was built in 1968, making it 57 years old in 2025. It was reconstructed in 1983.

What condition is I-285 over NS Railroad 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 March 2023.

How much traffic does I-285 over NS Railroad carry?

About 150,000 vehicles per day (2024 count), of which roughly 1% are trucks.

How long is I-285 over NS Railroad?

The structure is 156 ft (47.5 m) long with a longest span of 100 ft (30.5 m) and a deck 134 ft wide.

Who owns I-285 over NS Railroad?

It is owned by the State Highway Agency.