US Bridges

I 39 & US 51 NB over US 30

Fair

Lee County, Illinois · 4 MI N of Paw Paw · Structure no. 052005300000000

Built
1984
41 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
176 ft
1 main span
Daily traffic
9,550
2023 count
Owner
State
State Highway Agency

About this bridge

I 39 & US 51 NB over US 30 is a steel stringer/multi-beam or girder carrying I 39 & US 51 NB over US 30 in Lee County, Illinois. It was built in 1984, so it is 41 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 9,550 vehicles a day, roughly 41% of them trucks, projected to reach 9,797 by 2046. The structure is 176 ft (53.6 m) long and 42 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI 39 & US 51 NB
CrossesUS 30
Location4 MI N of Paw Paw
RouteInterstate 39
CountyLee County
StateIllinois
Coordinates41.76054, -89.00939
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating92.2 US tons
Inventory rating55 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadHS 20
Structure length176 ft (53.6 m)
Longest span127 ft (38.7 m)
Deck width42 ft (12.8 m)
Roadway width39 ft (11.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,550 (2023)
Projected traffic9,797 by 2046
Trucks41%
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 I 39 & US 51 NB over US 30 built?

It was built in 1984, making it 41 years old in 2025.

What condition is I 39 & US 51 NB over US 30 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 October 2023.

How much traffic does I 39 & US 51 NB over US 30 carry?

About 9,550 vehicles per day (2023 count), of which roughly 41% are trucks.

How long is I 39 & US 51 NB over US 30?

The structure is 176 ft (53.6 m) long with a longest span of 127 ft (38.7 m) and a deck 42 ft wide.

Who owns I 39 & US 51 NB over US 30?

It is owned by the State Highway Agency.