US Bridges

FAP 623 (at or 623 over I-80 EB & WB

Fair

Grundy County, Illinois · Seneca Junction · Structure no. 032011400000000

Built
2006
19 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
205 ft
2 main spans
Daily traffic
3,300
2024 count
Owner
State
State Highway Agency

About this bridge

FAP 623 (at or 623 over I-80 EB & WB is a steel continuous stringer/multi-beam or girder carrying FAP 623 (at or 623 over I-80 EB & WB in Grundy County, Illinois. It was built in 2006, so it is 19 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 3,300 vehicles a day, roughly 15% of them trucks, projected to reach 3,540 by 2046. The structure is 205 ft (62.6 m) long and 65 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesFAP 623 (at or 623
CrossesI-80 EB & WB
LocationSeneca Junction
CountyGrundy County
StateIllinois
Coordinates41.37679, -88.55709
Functional classRural Minor 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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionMarch 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 rating92.2 US tons
Inventory rating51.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2 (+2 approach)
Design loadHS 20
Structure length205 ft (62.6 m)
Longest span100 ft (30.6 m)
Deck width65 ft (19.8 m)
Roadway width62 ft (18.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,300 (2024)
Projected traffic3,540 by 2046
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed1.9 mi (3 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was FAP 623 (at or 623 over I-80 EB & WB built?

It was built in 2006, making it 19 years old in 2025.

What condition is FAP 623 (at or 623 over I-80 EB & WB 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 March 2023.

How much traffic does FAP 623 (at or 623 over I-80 EB & WB carry?

About 3,300 vehicles per day (2024 count), of which roughly 15% are trucks.

How long is FAP 623 (at or 623 over I-80 EB & WB?

The structure is 205 ft (62.6 m) long with a longest span of 100 ft (30.6 m) and a deck 65 ft wide.

Who owns FAP 623 (at or 623 over I-80 EB & WB?

It is owned by the State Highway Agency.