US Bridges

Ill 165 | FAS 2484 over Mackinaw River

Fair

McLean County, Illinois · 15.8 MI NE Ill 9 · Structure no. 057011000000000

Built
1928
97 years old, rebuilt 1986
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
247 ft
4 main spans
Daily traffic
1,350
2023 count
Owner
State
State Highway Agency

About this bridge

Ill 165 | FAS 2484 over Mackinaw River is a steel continuous stringer/multi-beam or girder carrying Ill 165 | FAS 2484 over Mackinaw River in McLean County, Illinois. It was built in 1928 and reconstructed in 1986, so it is 97 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 1,350 vehicles a day, roughly 14% of them trucks, projected to reach 1,350 by 2046. The structure is 247 ft (75.3 m) long and 35 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesIll 165 | FAS 2484
CrossesMackinaw River
Location15.8 MI NE Ill 9
RouteState Highway 165
CountyMcLean County
StateIllinois
Coordinates40.56837, -88.63217
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
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 within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating71.1 US tons
Inventory rating42.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length247 ft (75.3 m)
Longest span61 ft (18.5 m)
Deck width35 ft (10.7 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,350 (2023)
Projected traffic1,350 by 2046
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
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 Ill 165 | FAS 2484 over Mackinaw River built?

It was built in 1928, making it 97 years old in 2025. It was reconstructed in 1986.

What condition is Ill 165 | FAS 2484 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 Ill 165 | FAS 2484 over Mackinaw River carry?

About 1,350 vehicles per day (2023 count), of which roughly 14% are trucks.

How long is Ill 165 | FAS 2484 over Mackinaw River?

The structure is 247 ft (75.3 m) long with a longest span of 61 ft (18.5 m) and a deck 35 ft wide.

Who owns Ill 165 | FAS 2484 over Mackinaw River?

It is owned by the State Highway Agency.