US Bridges

Harlem RD over I-90

Fair

Winnebago County, Illinois · 2 MI S of Ill 173 · Structure no. 101991800000000

Built
1958
67 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
224 ft
4 main spans
Daily traffic
3,350
2022 count
Owner
Toll Authority
State Toll Authority

About this bridge

Harlem RD over I-90 is a prestressed concrete stringer/multi-beam or girder carrying Harlem RD over I-90 in Winnebago County, Illinois. It was built in 1958, so it is 67 years old, older 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 3,350 vehicles a day, roughly 2% of them trucks, projected to reach 3,889 by 2046. The structure is 224 ft (68.3 m) long and 34 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesHarlem RD
CrossesI-90
Location2 MI S of Ill 173
CountyWinnebago County
StateIllinois
Coordinates42.34345, -88.96503
Functional classUrban Collector

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 inspectionJuly 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 geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating91.4 US tons
Inventory rating54.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans4
Design loadUnknown
Structure length224 ft (68.3 m)
Longest span66 ft (20.1 m)
Deck width34 ft (10.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,350 (2022)
Projected traffic3,889 by 2046
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Toll Authority
Maintained byState Toll Authority
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 Harlem RD over I-90 built?

It was built in 1958, making it 67 years old in 2025.

What condition is Harlem RD over I-90 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 July 2024.

How much traffic does Harlem RD over I-90 carry?

About 3,350 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is Harlem RD over I-90?

The structure is 224 ft (68.3 m) long with a longest span of 66 ft (20.1 m) and a deck 34 ft wide.

Who owns Harlem RD over I-90?

It is owned by the State Toll Authority.