US Bridges

Il 251 FAS 255 over Mackinaw River

Fair

McLean County, Illinois · 5.5 M S of US 24 · Structure no. 057022600000000

Built
1991
34 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
434 ft
3 main spans
Daily traffic
2,150
2023 count
Owner
State
State Highway Agency

About this bridge

Il 251 FAS 255 over Mackinaw River is a steel continuous stringer/multi-beam or girder carrying Il 251 FAS 255 over Mackinaw River in McLean County, Illinois. It was built in 1991, so it is 34 years old, younger 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 2,150 vehicles a day, roughly 7% of them trucks, projected to reach 2,424 by 2046. The structure is 434 ft (132.2 m) long and 35 ft wide.

Location

Open in Google Maps
CarriesIl 251 FAS 255
CrossesMackinaw River
Location5.5 M S of US 24
RouteState Highway 251
CountyMcLean County
StateIllinois
Coordinates40.66375, -89.00526
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating65.7 US tons
Inventory rating39.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length434 ft (132.2 m)
Longest span163 ft (49.7 m)
Deck width35 ft (10.7 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,150 (2023)
Projected traffic2,424 by 2046
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Il 251 FAS 255 over Mackinaw River built?

It was built in 1991, making it 34 years old in 2025.

What condition is Il 251 FAS 255 over Mackinaw River 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 April 2023.

How much traffic does Il 251 FAS 255 over Mackinaw River carry?

About 2,150 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is Il 251 FAS 255 over Mackinaw River?

The structure is 434 ft (132.2 m) long with a longest span of 163 ft (49.7 m) and a deck 35 ft wide.

Who owns Il 251 FAS 255 over Mackinaw River?

It is owned by the State Highway Agency.