US Bridges

I-172 & Ill 336 NB over US 24

Good

Adams County, Illinois · US 24 & Il 336 JCT · Structure no. 001008100000000

Built
1994
31 years old
Condition
Good
inspected December 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
164 ft
2 main spans
Daily traffic
3,675
2023 count
Owner
State
State Highway Agency

About this bridge

I-172 & Ill 336 NB over US 24 is a prestressed concrete stringer/multi-beam or girder carrying I-172 & Ill 336 NB over US 24 in Adams County, Illinois. It was built in 1994, so it is 31 years old, younger than the Illinois average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 3,675 vehicles a day, roughly 11% of them trucks, projected to reach 3,737 by 2046. The structure is 164 ft (50 m) long and 43 ft wide.

CarriesI-172 & Ill 336 NB
CrossesUS 24
LocationUS 24 & Il 336 JCT
RouteInterstate 172
Coordinates40.00739, -91.30834
Functional classRural Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.6 US tons
Inventory rating38.3 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length164 ft (50 m)
Longest span81 ft (24.6 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,675 (2023)
Projected traffic3,737 by 2046
Trucks11%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
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-172 & Ill 336 NB over US 24 built?

It was built in 1994, making it 31 years old in 2025.

What condition is I-172 & Ill 336 NB over US 24 in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in December 2024.

How much traffic does I-172 & Ill 336 NB over US 24 carry?

About 3,675 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is I-172 & Ill 336 NB over US 24?

The structure is 164 ft (50 m) long with a longest span of 81 ft (24.6 m) and a deck 43 ft wide.

Who owns I-172 & Ill 336 NB over US 24?

It is owned by the State Highway Agency.