US Bridges

I-575 (nbl) over CR 171 Big Shanty Road

Good

Cobb County, Georgia · 3 MI E of Kennesaw · Structure no. 000000006701150

Built
1980
45 years old
Condition
Good
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
157 ft
3 main spans
Daily traffic
86,200
2024 count
Owner
State
State Highway Agency

About this bridge

I-575 (nbl) over CR 171 Big Shanty Road is a steel stringer/multi-beam or girder carrying I-575 (nbl) over CR 171 Big Shanty Road in Cobb County, Georgia. It was built in 1980, so it is 45 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 86,200 vehicles a day, roughly 1% of them trucks, projected to reach 113,130 by 2032. The structure is 157 ft (47.9 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-575 (nbl)
CrossesCR 171 Big Shanty Road
Location3 MI E of Kennesaw
RouteInterstate 575
CountyCobb County
StateGeorgia
Coordinates34.0292, -84.56062
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 inspectionMarch 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 rating75.9 US tons
Inventory rating45 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length157 ft (47.9 m)
Longest span80 ft (24.4 m)
Deck width44 ft (13.3 m)
Roadway width40 ft (12.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic86,200 (2024)
Projected traffic113,130 by 2032
Trucks1%
Lanes on structure2
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$920,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-575 (nbl) over CR 171 Big Shanty Road built?

It was built in 1980, making it 45 years old in 2025.

What condition is I-575 (nbl) 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 March 2023.

How much traffic does I-575 (nbl) over CR 171 Big Shanty Road carry?

About 86,200 vehicles per day (2024 count), of which roughly 1% are trucks.

How long is I-575 (nbl) over CR 171 Big Shanty Road?

The structure is 157 ft (47.9 m) long with a longest span of 80 ft (24.4 m) and a deck 44 ft wide.

Who owns I-575 (nbl) over CR 171 Big Shanty Road?

It is owned by the State Highway Agency.