US Bridges

I-75(NBL) over Big Shanty Con

Good

Cobb County, Georgia · 2.3 MI South of Kennesaw · Structure no. 000000006753070

Built
2012
13 years old
Condition
Good
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
203 ft
3 main spans
Daily traffic
140,000
2024 count
Owner
State
State Highway Agency

About this bridge

I-75(NBL) over Big Shanty Con is a prestressed concrete stringer/multi-beam or girder carrying I-75(NBL) over Big Shanty Con in Cobb County, Georgia. It was built in 2012, so it is 13 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 140,000 vehicles a day, roughly 11% of them trucks, projected to reach 83,200 by 2031. The structure is 203 ft (61.9 m) long and 63 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesI-75(NBL)
CrossesBig Shanty Con
Location2.3 MI South of Kennesaw
RouteInterstate 401
StateGeorgia
Coordinates34.02579, -84.57291
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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating74 US tons
Inventory rating35.9 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length203 ft (61.9 m)
Longest span111 ft (33.8 m)
Deck width63 ft (19.3 m)
Roadway width60 ft (18.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic140,000 (2024)
Projected traffic83,200 by 2031
Trucks11%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-75(NBL) over Big Shanty Con built?

It was built in 2012, making it 13 years old in 2025.

What condition is I-75(NBL) over Big Shanty Con 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 May 2023.

How much traffic does I-75(NBL) over Big Shanty Con carry?

About 140,000 vehicles per day (2024 count), of which roughly 11% are trucks.

How long is I-75(NBL) over Big Shanty Con?

The structure is 203 ft (61.9 m) long with a longest span of 111 ft (33.8 m) and a deck 63 ft wide.

Who owns I-75(NBL) over Big Shanty Con?

It is owned by the State Highway Agency.