US Bridges

I-85 Nbcd over Sweetwater Creek

Good

Gwinnett County, Georgia · 3.5 MI SE of Duluth · Structure no. 000000013552170

Built
2008
17 years old
Condition
Good
inspected February 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
175 ft
3 main spans
Daily traffic
38,100
2024 count
Owner
State
State Highway Agency

About this bridge

I-85 Nbcd over Sweetwater Creek is a prestressed concrete stringer/multi-beam or girder carrying I-85 Nbcd over Sweetwater Creek in Gwinnett County, Georgia. It was built in 2008, so it is 17 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 38,100 vehicles a day, roughly 1% of them trucks, projected to reach 38,280 by 2032. The structure is 175 ft (53.3 m) long and 63 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesI-85 Nbcd
CrossesSweetwater Creek
Location3.5 MI SE of Duluth
RouteInterstate 85
CountyGwinnett County
StateGeorgia
Coordinates33.96253, -84.1043
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.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating79.9 US tons
Inventory rating40.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length175 ft (53.3 m)
Longest span75 ft (22.9 m)
Deck width63 ft (19.3 m)
Roadway width60 ft (18.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic38,100 (2024)
Projected traffic38,280 by 2032
Trucks1%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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$1.3 million
NavigationNo navigation control on waterway

Frequently asked questions

When was I-85 Nbcd over Sweetwater Creek built?

It was built in 2008, making it 17 years old in 2025.

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

About 38,100 vehicles per day (2024 count), of which roughly 1% are trucks.

How long is I-85 Nbcd over Sweetwater Creek?

The structure is 175 ft (53.3 m) long with a longest span of 75 ft (22.9 m) and a deck 63 ft wide.

Who owns I-85 Nbcd over Sweetwater Creek?

It is owned by the State Highway Agency.