US Bridges

I-75 Managed Lanes over SR 280 Delk Road

Good

Cobb County, Georgia · In East Marietta · Structure no. 000000006753380

Built
2017
8 years old
Condition
Good
inspected February 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
2,311 ft
17 main spans
Daily traffic
6,650
2024 count
Owner
State
State Highway Agency

About this bridge

I-75 Managed Lanes over SR 280 Delk Road is a prestressed concrete stringer/multi-beam or girder carrying I-75 Managed Lanes over SR 280 Delk Road in Cobb County, Georgia. It was built in 2017, so it is 8 years old, younger 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 6,650 vehicles a day, projected to reach 18,520 by 2035. The structure is 2,311 ft (704.4 m) long and 39 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesI-75 Managed Lanes
CrossesSR 280 Delk Road
LocationIn East Marietta
RouteInterstate 75
CountyCobb County
StateGeorgia
Coordinates33.92228, -84.48575
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 inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating74 US tons
Inventory rating35.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans17
Design loadHS 20 + Mod
Structure length2,311 ft (704.4 m)
Longest span155 ft (47.2 m)
Deck width39 ft (11.9 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,650 (2024)
Projected traffic18,520 by 2035
Trucks0%
Lanes on structure2
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesHighway
Detour if closed5 mi (8 km)
TollOn a toll 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$307.8 million (2018 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-75 Managed Lanes over SR 280 Delk Road built?

It was built in 2017, making it 8 years old in 2025.

What condition is I-75 Managed Lanes over SR 280 Delk Road 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 February 2024.

How much traffic does I-75 Managed Lanes over SR 280 Delk Road carry?

About 6,650 vehicles per day (2024 count).

How long is I-75 Managed Lanes over SR 280 Delk Road?

The structure is 2,311 ft (704.4 m) long with a longest span of 155 ft (47.2 m) and a deck 39 ft wide.

Who owns I-75 Managed Lanes over SR 280 Delk Road?

It is owned by the State Highway Agency.