US Bridges

I-285 over I-20

Good

DeKalb County, Georgia · 5.8 MI SE of Decatur · Structure no. 000000008900960

Built
1965
60 years old, rebuilt 1984
Condition
Good
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
245 ft
4 main spans
Daily traffic
185,000
2024 count
Owner
State
State Highway Agency

About this bridge

I-285 over I-20 is a steel continuous stringer/multi-beam or girder carrying I-285 over I-20 in DeKalb County, Georgia. It was built in 1965 and reconstructed in 1984, so it is 60 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 185,000 vehicles a day, roughly 1% of them trucks, projected to reach 226,185 by 2031. The structure is 245 ft (74.7 m) long and 137 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesI-285
CrossesI-20
Location5.8 MI SE of Decatur
RouteInterstate 285
StateGeorgia
Coordinates33.71463, -84.24092
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 inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61 US tons
Inventory rating35.9 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length245 ft (74.7 m)
Longest span82 ft (25 m)
Deck width137 ft (41.9 m)
Roadway width131 ft (40 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic185,000 (2024)
Projected traffic226,185 by 2031
Trucks1%
Lanes on structure7
Traffic directionTwo-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$3.4 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-285 over I-20 built?

It was built in 1965, making it 60 years old in 2025. It was reconstructed in 1984.

What condition is I-285 over I-20 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 April 2024.

How much traffic does I-285 over I-20 carry?

About 185,000 vehicles per day (2024 count), of which roughly 1% are trucks.

How long is I-285 over I-20?

The structure is 245 ft (74.7 m) long with a longest span of 82 ft (25 m) and a deck 137 ft wide.

Who owns I-285 over I-20?

It is owned by the State Highway Agency.