US Bridges

I-75 Managed Lanes over CR 171 Big Shanty Road

Good

Cobb County, Georgia · 2.3 MI NE of Kennesaw · Structure no. 000000006753510

Built
2017
8 years old
Condition
Good
inspected February 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
203 ft
3 main spans
Daily traffic
2,047
2024 count
Owner
State
State Highway Agency

About this bridge

I-75 Managed Lanes over CR 171 Big Shanty Road is a prestressed concrete stringer/multi-beam or girder carrying I-75 Managed Lanes over CR 171 Big Shanty 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 2,047 vehicles a day, projected to reach 7,580 by 2035. The structure is 203 ft (61.9 m) long and 29 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesI-75 Managed Lanes
CrossesCR 171 Big Shanty Road
Location2.3 MI NE of Kennesaw
RouteInterstate 75
StateGeorgia
Coordinates34.0258, -84.57315
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 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 rating52.9 US tons
Inventory rating34 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 width29 ft (8.8 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,047 (2024)
Projected traffic7,580 by 2035
Trucks0%
Lanes on structure2
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 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$27 million (2018 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-75 Managed Lanes over CR 171 Big Shanty Road built?

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

What condition is I-75 Managed Lanes over CR 171 Big Shanty 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 CR 171 Big Shanty Road carry?

About 2,047 vehicles per day (2024 count).

How long is I-75 Managed Lanes over CR 171 Big Shanty Road?

The structure is 203 ft (61.9 m) long with a longest span of 111 ft (33.8 m) and a deck 29 ft wide.

Who owns I-75 Managed Lanes over CR 171 Big Shanty Road?

It is owned by the State Highway Agency.