US Bridges

I-55 (sb) over Burlingtn Northrn RR

Fair

Montgomery County, Illinois · 1.8M N Il 16 Int. · Structure no. 068004800000000

Built
1973
52 years old, rebuilt 2022
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
228 ft
3 main spans
Daily traffic
13,250
2023 count
Owner
State
State Highway Agency

About this bridge

I-55 (sb) over Burlingtn Northrn RR is a steel continuous stringer/multi-beam or girder carrying I-55 (sb) over Burlingtn Northrn RR in Montgomery County, Illinois. It was built in 1973 and reconstructed in 2022, so it is 52 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 13,250 vehicles a day, roughly 32% of them trucks, projected to reach 12,928 by 2046. The structure is 228 ft (69.4 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-55 (sb)
CrossesBurlingtn Northrn RR
Location1.8M N Il 16 Int.
RouteInterstate 55
CountyMontgomery County
StateIllinois
Coordinates39.1974, -89.66498
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure8 Very GoodNo problems noted.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating89.6 US tons
Inventory rating53.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length228 ft (69.4 m)
Longest span86 ft (26.2 m)
Deck width43 ft (13 m)
Roadway width38 ft (11.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,250 (2023)
Projected traffic12,928 by 2046
Trucks32%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-55 (sb) over Burlingtn Northrn RR built?

It was built in 1973, making it 52 years old in 2025. It was reconstructed in 2022.

What condition is I-55 (sb) over Burlingtn Northrn RR 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 March 2024.

How much traffic does I-55 (sb) over Burlingtn Northrn RR carry?

About 13,250 vehicles per day (2023 count), of which roughly 32% are trucks.

How long is I-55 (sb) over Burlingtn Northrn RR?

The structure is 228 ft (69.4 m) long with a longest span of 86 ft (26.2 m) and a deck 43 ft wide.

Who owns I-55 (sb) over Burlingtn Northrn RR?

It is owned by the State Highway Agency.