US Bridges

I-39 & US 51 NB over FAP 553(IL 72)

Fair

Ogle County, Illinois · 3.5 MI S Winn. CO LN · Structure no. 071004700000000

Built
1981
44 years old
Condition
Fair
inspected November 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
177 ft
1 main span
Daily traffic
16,400
2023 count
Owner
State
State Highway Agency

About this bridge

I-39 & US 51 NB over FAP 553(IL 72) is a steel stringer/multi-beam or girder carrying I-39 & US 51 NB over FAP 553(IL 72) 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 16,400 vehicles a day, roughly 31% of them trucks, projected to reach 15,756 by 2046. The structure is 177 ft (53.8 m) long and 47 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
CrossesFAP 553(IL 72)
Location3.5 MI S Winn. CO LN
RouteInterstate 39
CountyOgle County
StateIllinois
Coordinates42.10088, -89.02268
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionNovember 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 rating89.3 US tons
Inventory rating53.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadHS 20 + Mod
Structure length177 ft (53.8 m)
Longest span128 ft (38.9 m)
Deck width47 ft (14.3 m)
Roadway width46 ft (14.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16,400 (2023)
Projected traffic15,756 by 2046
Trucks31%
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 FAP 553(IL 72) built?

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

What condition is I-39 & US 51 NB over FAP 553(IL 72) 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 November 2023.

How much traffic does I-39 & US 51 NB over FAP 553(IL 72) carry?

About 16,400 vehicles per day (2023 count), of which roughly 31% are trucks.

How long is I-39 & US 51 NB over FAP 553(IL 72)?

The structure is 177 ft (53.8 m) long with a longest span of 128 ft (38.9 m) and a deck 47 ft wide.

Who owns I-39 & US 51 NB over FAP 553(IL 72)?

It is owned by the State Highway Agency.