US Bridges

Ch 6 (fas 557) over I- 55

Fair

Logan County, Illinois · Atlanta Interchange · Structure no. 054006900000000

Built
1976
49 years old
Condition
Fair
inspected January 2025
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
334 ft
2 main spans
Daily traffic
2,800
2022 count
Owner
State
State Highway Agency

About this bridge

Ch 6 (fas 557) over I- 55 is a steel continuous stringer/multi-beam or girder carrying Ch 6 (fas 557) over I- 55 in Logan County, Illinois. It was built in 1976, so it is 49 years old, older than the Illinois average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 2,800 vehicles a day, roughly 15% of them trucks, projected to reach 2,888 by 2046. The structure is 334 ft (101.7 m) long and 68 ft wide.

Location

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CarriesCh 6 (fas 557)
CrossesI- 55
LocationAtlanta Interchange
RouteCounty Highway 0
CountyLogan County
StateIllinois
Coordinates40.25961, -89.22034
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating91.8 US tons
Inventory rating48.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2 (+2 approach)
Design loadHS 20
Structure length334 ft (101.7 m)
Longest span129 ft (39.4 m)
Deck width68 ft (20.7 m)
Roadway width48 ft (14.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,800 (2022)
Projected traffic2,888 by 2046
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemNo

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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Ch 6 (fas 557) over I- 55 built?

It was built in 1976, making it 49 years old in 2025.

What condition is Ch 6 (fas 557) over I- 55 in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in January 2025.

How much traffic does Ch 6 (fas 557) over I- 55 carry?

About 2,800 vehicles per day (2022 count), of which roughly 15% are trucks.

How long is Ch 6 (fas 557) over I- 55?

The structure is 334 ft (101.7 m) long with a longest span of 129 ft (39.4 m) and a deck 68 ft wide.

Who owns Ch 6 (fas 557) over I- 55?

It is owned by the State Highway Agency.