US Bridges

I-285 over Ramp I-285C to I-75 Nbl

Fair

Cobb County, Georgia · 6.7 Miles South East of M · Structure no. 000000006701030

Built
1978
47 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
330 ft
3 main spans
Daily traffic
72,600
2024 count
Owner
State
State Highway Agency

About this bridge

I-285 over Ramp I-285C to I-75 Nbl is a steel continuous stringer/multi-beam or girder carrying I-285 over Ramp I-285C to I-75 Nbl in Cobb County, Georgia. It was built in 1978, so it is 47 years old, younger 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 72,600 vehicles a day, roughly 1% of them trucks, projected to reach 119,505 by 2032. The structure is 330 ft (100.6 m) long and 114 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-285
CrossesRamp I-285C to I-75 Nbl
Location6.7 Miles South East of M
RouteInterstate 285
CountyCobb County
StateGeorgia
Coordinates33.89112, -84.45904
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating65.9 US tons
Inventory rating38.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3 (+2 approach)
Design loadHS 20 + Mod
Structure length330 ft (100.6 m)
Longest span207 ft (63.1 m)
Deck width114 ft (34.7 m)
Roadway width108 ft (32.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic72,600 (2024)
Projected traffic119,505 by 2032
Trucks1%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkNon-Interstate 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$3.5 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-285 over Ramp I-285C to I-75 Nbl built?

It was built in 1978, making it 47 years old in 2025.

What condition is I-285 over Ramp I-285C to I-75 Nbl 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 June 2023.

How much traffic does I-285 over Ramp I-285C to I-75 Nbl carry?

About 72,600 vehicles per day (2024 count), of which roughly 1% are trucks.

How long is I-285 over Ramp I-285C to I-75 Nbl?

The structure is 330 ft (100.6 m) long with a longest span of 207 ft (63.1 m) and a deck 114 ft wide.

Who owns I-285 over Ramp I-285C to I-75 Nbl?

It is owned by the State Highway Agency.