US Bridges

I-55 SB over US 136/FAP 315

Fair

McLean County, Illinois · Mclean · Structure no. 057015400000000

Built
1975
50 years old
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
219 ft
2 main spans
Daily traffic
10,800
2023 count
Owner
State
State Highway Agency

About this bridge

I-55 SB over US 136/FAP 315 is a steel continuous stringer/multi-beam or girder carrying I-55 SB over US 136/FAP 315 in McLean County, Illinois. It was built in 1975, so it is 50 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 5 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 10,800 vehicles a day, roughly 37% of them trucks, projected to reach 11,262 by 2046. The structure is 219 ft (66.9 m) long and 42 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-55 SB
CrossesUS 136/FAP 315
LocationMclean
RouteInterstate 55
CountyMcLean County
StateIllinois
Coordinates40.31127, -89.16309
Functional classRural 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating74.3 US tons
Inventory rating44.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2 (+2 approach)
Design loadHS 20 + Mod
Structure length219 ft (66.9 m)
Longest span74 ft (22.5 m)
Deck width42 ft (12.8 m)
Roadway width38 ft (11.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,800 (2023)
Projected traffic11,262 by 2046
Trucks37%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-55 SB over US 136/FAP 315 built?

It was built in 1975, making it 50 years old in 2025.

What condition is I-55 SB over US 136/FAP 315 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 US 136/FAP 315 carry?

About 10,800 vehicles per day (2023 count), of which roughly 37% are trucks.

How long is I-55 SB over US 136/FAP 315?

The structure is 219 ft (66.9 m) long with a longest span of 74 ft (22.5 m) and a deck 42 ft wide.

Who owns I-55 SB over US 136/FAP 315?

It is owned by the State Highway Agency.