US Bridges

I-39 & US 51 SB over I-88(E-W Tollway)

Fair

Ogle County, Illinois · 1 MI N of Lee Co.Ln. · Structure no. 071006200000000

Built
1981
44 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
278 ft
2 main spans
Daily traffic
9,750
2023 count
Owner
State
State Highway Agency

About this bridge

I-39 & US 51 SB over I-88(E-W Tollway) is a steel continuous stringer/multi-beam or girder carrying I-39 & US 51 SB over I-88(E-W Tollway) in Ogle County, Illinois. It was built in 1981, so it is 44 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 9,750 vehicles a day, roughly 39% of them trucks, projected to reach 10,244 by 2046. The structure is 278 ft (84.8 m) long and 53 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-39 & US 51 SB
CrossesI-88(E-W Tollway)
Location1 MI N of Lee Co.Ln.
RouteInterstate 39
CountyOgle County
StateIllinois
Coordinates41.90497, -89.02082
Functional classUrban 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 inspectionAugust 2023
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 geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating81.8 US tons
Inventory rating48.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2 (+2 approach)
Design loadHS 20 + Mod
Structure length278 ft (84.8 m)
Longest span107 ft (32.6 m)
Deck width53 ft (16.1 m)
Roadway width49 ft (15 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,750 (2023)
Projected traffic10,244 by 2046
Trucks39%
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 NetworkNon-Interstate 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 SB over I-88(E-W Tollway) built?

It was built in 1981, making it 44 years old in 2025.

What condition is I-39 & US 51 SB over I-88(E-W Tollway) 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 August 2023.

How much traffic does I-39 & US 51 SB over I-88(E-W Tollway) carry?

About 9,750 vehicles per day (2023 count), of which roughly 39% are trucks.

How long is I-39 & US 51 SB over I-88(E-W Tollway)?

The structure is 278 ft (84.8 m) long with a longest span of 107 ft (32.6 m) and a deck 53 ft wide.

Who owns I-39 & US 51 SB over I-88(E-W Tollway)?

It is owned by the State Highway Agency.