US Bridges

NB I-155 over Ill 9

Fair

Tazewell County, Illinois · 5.6 MI S of Il 98 · Structure no. 090013500000000

Built
1990
35 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
183 ft
1 main span
Daily traffic
7,550
2023 count
Owner
State
State Highway Agency

About this bridge

NB I-155 over Ill 9 is a steel stringer/multi-beam or girder carrying NB I-155 over Ill 9 in Tazewell County, Illinois. It was built in 1990, so it is 35 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 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 7,550 vehicles a day, roughly 19% of them trucks, projected to reach 7,121 by 2046. The structure is 183 ft (55.8 m) long and 45 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesNB I-155
CrossesIll 9
Location5.6 MI S of Il 98
RouteInterstate 155
CountyTazewell County
StateIllinois
Coordinates40.52614, -89.47682
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 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 geometry8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating69.7 US tons
Inventory rating41.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadHS 20
Structure length183 ft (55.8 m)
Longest span124 ft (37.8 m)
Deck width45 ft (13.8 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,550 (2023)
Projected traffic7,121 by 2046
Trucks19%
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 NB I-155 over Ill 9 built?

It was built in 1990, making it 35 years old in 2025.

What condition is NB I-155 over Ill 9 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 June 2024.

How much traffic does NB I-155 over Ill 9 carry?

About 7,550 vehicles per day (2023 count), of which roughly 19% are trucks.

How long is NB I-155 over Ill 9?

The structure is 183 ft (55.8 m) long with a longest span of 124 ft (37.8 m) and a deck 45 ft wide.

Who owns NB I-155 over Ill 9?

It is owned by the State Highway Agency.