US Bridges

Port Byron RD over I-88

Fair

Rock Island County, Illinois · 1.5 Mi. W.Hillsdale · Structure no. 081013100000000

Built
1975
50 years old
Condition
Fair
inspected January 2025
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
256 ft
2 main spans
Daily traffic
650
2020 count
Owner
State
State Highway Agency

About this bridge

Port Byron RD over I-88 is a steel continuous stringer/multi-beam or girder carrying Port Byron RD over I-88 in Rock Island County, Illinois. It was built in 1975, so it is 50 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 6 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 650 vehicles a day, roughly 22% of them trucks, projected to reach 657 by 2046. The structure is 256 ft (78 m) long and 46 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesPort Byron RD
CrossesI-88
Location1.5 Mi. W.Hillsdale
RouteCounty Highway 0
CountyRock Island County
StateIllinois
Coordinates41.61354, -90.19408
Functional classRural Major 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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60.7 US tons
Inventory rating36.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2 (+2 approach)
Design loadHS 20 + Mod
Structure length256 ft (78 m)
Longest span108 ft (32.9 m)
Deck width46 ft (14 m)
Roadway width43 ft (13 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic650 (2020)
Projected traffic657 by 2046
Trucks22%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed6.8 mi (11 km)
TollOn a free road
National Highway SystemNo

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 Port Byron RD over I-88 built?

It was built in 1975, making it 50 years old in 2025.

What condition is Port Byron RD over I-88 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 January 2025.

How much traffic does Port Byron RD over I-88 carry?

About 650 vehicles per day (2020 count), of which roughly 22% are trucks.

How long is Port Byron RD over I-88?

The structure is 256 ft (78 m) long with a longest span of 108 ft (32.9 m) and a deck 46 ft wide.

Who owns Port Byron RD over I-88?

It is owned by the State Highway Agency.