US Bridges

I-85 Nbl over Sweetwater Creek

Good

Gwinnett County, Georgia · 3.5 MI SE of Duluth · Structure no. 000000013500520

Built
1958
67 years old, rebuilt 2008
Condition
Good
inspected February 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
152 ft
3 main spans
Daily traffic
131,000
2024 count
Owner
State
State Highway Agency

About this bridge

I-85 Nbl over Sweetwater Creek is a prestressed concrete stringer/multi-beam or girder carrying I-85 Nbl over Sweetwater Creek in Gwinnett County, Georgia. It was built in 1958 and reconstructed in 2008, so it is 67 years old, older 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 131,000 vehicles a day, roughly 12% of them trucks, projected to reach 220,350 by 2032. The structure is 152 ft (46.3 m) long and 133 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesI-85 Nbl
CrossesSweetwater Creek
Location3.5 MI SE of Duluth
RouteInterstate 85
StateGeorgia
Coordinates33.96281, -84.10448
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.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating74 US tons
Inventory rating42 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length152 ft (46.3 m)
Longest span56 ft (17.1 m)
Deck width133 ft (40.6 m)
Roadway width130 ft (39.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic131,000 (2024)
Projected traffic220,350 by 2032
Trucks12%
Lanes on structure7
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
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$2.1 million
NavigationNo navigation control on waterway

Frequently asked questions

When was I-85 Nbl over Sweetwater Creek built?

It was built in 1958, making it 67 years old in 2025. It was reconstructed in 2008.

What condition is I-85 Nbl over Sweetwater Creek 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-85 Nbl over Sweetwater Creek carry?

About 131,000 vehicles per day (2024 count), of which roughly 12% are trucks.

How long is I-85 Nbl over Sweetwater Creek?

The structure is 152 ft (46.3 m) long with a longest span of 56 ft (17.1 m) and a deck 133 ft wide.

Who owns I-85 Nbl over Sweetwater Creek?

It is owned by the State Highway Agency.