US Bridges

I-285 over Chattahoochee River

Fair

Cobb County, Georgia · 7 MI SE of Marietta · Structure no. 000000006701090

Built
1962
63 years old, rebuilt 1994
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
785 ft
9 main spans
Daily traffic
211,000
2024 count
Owner
State
State Highway Agency

About this bridge

I-285 over Chattahoochee River is a steel continuous stringer/multi-beam or girder carrying I-285 over Chattahoochee River in Cobb County, Georgia. It was built in 1962 and reconstructed in 1994, so it is 63 years old, older than the Georgia average of 47.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 211,000 vehicles a day, roughly 1% of them trucks, projected to reach 308,820 by 2032. The structure is 785 ft (239.3 m) long and 150 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesI-285
CrossesChattahoochee River
Location7 MI SE of Marietta
RouteInterstate 285
StateGeorgia
Coordinates33.90174, -84.44239
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating28 US tons
Inventory rating17 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans9
Design loadHS 20 + Mod
Structure length785 ft (239.3 m)
Longest span100 ft (30.5 m)
Deck width150 ft (45.7 m)
Roadway width148 ft (45 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic211,000 (2024)
Projected traffic308,820 by 2032
Trucks1%
Lanes on structure12
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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$17.1 million
NavigationNo navigation control on waterway

Frequently asked questions

When was I-285 over Chattahoochee River built?

It was built in 1962, making it 63 years old in 2025. It was reconstructed in 1994.

What condition is I-285 over Chattahoochee River in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in April 2023.

How much traffic does I-285 over Chattahoochee River carry?

About 211,000 vehicles per day (2024 count), of which roughly 1% are trucks.

How long is I-285 over Chattahoochee River?

The structure is 785 ft (239.3 m) long with a longest span of 100 ft (30.5 m) and a deck 150 ft wide.

Who owns I-285 over Chattahoochee River?

It is owned by the State Highway Agency.