US Bridges

SR 400 (nbl) over I-85

Good

Fulton County, Georgia · In N Atlanta · Structure no. 000000012107350

Built
1993
32 years old
Condition
Good
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
1,825 ft
2 main spans
Daily traffic
83,800
2024 count
Owner
State
State Highway Agency

About this bridge

SR 400 (nbl) over I-85 is a steel continuous stringer/multi-beam or girder carrying SR 400 (nbl) over I-85 in Fulton County, Georgia. It was built in 1993, so it is 32 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 83,800 vehicles a day, roughly 1% of them trucks, projected to reach 119,025 by 2032. The structure is 1,825 ft (556.3 m) long and 51 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesSR 400 (nbl)
CrossesI-85
LocationIn N Atlanta
RouteState Highway 400
CountyFulton County
StateGeorgia
Coordinates33.82032, -84.36009
Functional classUrban Principal Arterial - Other Freeway or Expressway

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 protection8 Very GoodNo problems noted.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations on dry land well above flood water elevations
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67.9 US tons
Inventory rating20.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2 (+13 approach)
Design loadHS 20 + Mod
Structure length1,825 ft (556.3 m)
Longest span280 ft (85.3 m)
Deck width51 ft (15.6 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic83,800 (2024)
Projected traffic119,025 by 2032
Trucks1%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and waterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemYes

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$10.7 million
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 400 (nbl) over I-85 built?

It was built in 1993, making it 32 years old in 2025.

What condition is SR 400 (nbl) over I-85 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 SR 400 (nbl) over I-85 carry?

About 83,800 vehicles per day (2024 count), of which roughly 1% are trucks.

How long is SR 400 (nbl) over I-85?

The structure is 1,825 ft (556.3 m) long with a longest span of 280 ft (85.3 m) and a deck 51 ft wide.

Who owns SR 400 (nbl) over I-85?

It is owned by the State Highway Agency.