US Bridges

US 51 & Il 75 over I-90

Fair

Winnebago County, Illinois · E. Edge South Beloit · Structure no. 101017000000000

Built
2000
25 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
219 ft
2 main spans
Daily traffic
8,950
2023 count
Owner
State
State Highway Agency

About this bridge

US 51 & Il 75 over I-90 is a prestressed concrete continuous stringer/multi-beam or girder carrying US 51 & Il 75 over I-90 in Winnebago County, Illinois. It was built in 2000, so it is 25 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 8,950 vehicles a day, roughly 22% of them trucks, projected to reach 9,393 by 2046. The structure is 219 ft (66.7 m) long and 101 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesUS 51 & Il 75
CrossesI-90
LocationE. Edge South Beloit
RouteU.S. Route 51
CountyWinnebago County
StateIllinois
Coordinates42.49151, -88.9947
Functional classUrban Other Principal Arterial

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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating98.2 US tons
Inventory rating52.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length219 ft (66.7 m)
Longest span118 ft (35.9 m)
Deck width101 ft (30.9 m)
Roadway width93 ft (28.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,950 (2023)
Projected traffic9,393 by 2046
Trucks22%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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 US 51 & Il 75 over I-90 built?

It was built in 2000, making it 25 years old in 2025.

What condition is US 51 & Il 75 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 April 2023.

How much traffic does US 51 & Il 75 over I-90 carry?

About 8,950 vehicles per day (2023 count), of which roughly 22% are trucks.

How long is US 51 & Il 75 over I-90?

The structure is 219 ft (66.7 m) long with a longest span of 118 ft (35.9 m) and a deck 101 ft wide.

Who owns US 51 & Il 75 over I-90?

It is owned by the State Highway Agency.