US Bridges

FAI 172 NB over Ill 57

Fair

Adams County, Illinois · I-172/IL57 Int · Structure no. 001006500000000

Built
1982
43 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
210 ft
1 main span
Daily traffic
6,550
2023 count
Owner
State
State Highway Agency

About this bridge

FAI 172 NB over Ill 57 is a steel stringer/multi-beam or girder carrying FAI 172 NB over Ill 57 in Adams County, Illinois. It was built in 1982, so it is 43 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 6,550 vehicles a day, roughly 16% of them trucks, projected to reach 6,565 by 2046. The structure is 210 ft (63.9 m) long and 53 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesFAI 172 NB
CrossesIll 57
LocationI-172/IL57 Int
RouteInterstate 172
Coordinates39.78812, -91.30804
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionMay 2023
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 rating67.5 US tons
Inventory rating40.3 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadHS 20
Structure length210 ft (63.9 m)
Longest span139 ft (42.5 m)
Deck width53 ft (16.2 m)
Roadway width50 ft (15.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,550 (2023)
Projected traffic6,565 by 2046
Trucks16%
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 FAI 172 NB over Ill 57 built?

It was built in 1982, making it 43 years old in 2025.

What condition is FAI 172 NB over Ill 57 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 May 2023.

How much traffic does FAI 172 NB over Ill 57 carry?

About 6,550 vehicles per day (2023 count), of which roughly 16% are trucks.

How long is FAI 172 NB over Ill 57?

The structure is 210 ft (63.9 m) long with a longest span of 139 ft (42.5 m) and a deck 53 ft wide.

Who owns FAI 172 NB over Ill 57?

It is owned by the State Highway Agency.