US Bridges

Il 40 FAP 646 over I-80

Poor

Bureau County, Illinois · 3.5 Mi. N of Buda · Structure no. 006008900000000

Built
1963
62 years old
Condition
Poor
inspected February 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
270 ft
4 main spans
Daily traffic
2,400
2023 count
Owner
State
State Highway Agency

About this bridge

Il 40 FAP 646 over I-80 is a steel stringer/multi-beam or girder carrying Il 40 FAP 646 over I-80 in Bureau County, Illinois. It was built in 1963, so it is 62 years old, older than the Illinois average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 3 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 2,400 vehicles a day, roughly 16% of them trucks, projected to reach 3,081 by 2046. The structure is 270 ft (82.4 m) long and 36 ft wide.

Location

Open in Google Maps
CarriesIl 40 FAP 646
CrossesI-80
Location3.5 Mi. N of Buda
RouteState Highway 40
CountyBureau County
StateIllinois
Coordinates41.38696, -89.68543
Functional classRural Minor Arterial

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating68.2 US tons
Inventory rating36.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length270 ft (82.4 m)
Longest span87 ft (26.5 m)
Deck width36 ft (10.9 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,400 (2023)
Projected traffic3,081 by 2046
Trucks16%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
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 Il 40 FAP 646 over I-80 built?

It was built in 1963, making it 62 years old in 2025.

What condition is Il 40 FAP 646 over I-80 in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in February 2023.

How much traffic does Il 40 FAP 646 over I-80 carry?

About 2,400 vehicles per day (2023 count), of which roughly 16% are trucks.

How long is Il 40 FAP 646 over I-80?

The structure is 270 ft (82.4 m) long with a longest span of 87 ft (26.5 m) and a deck 36 ft wide.

Who owns Il 40 FAP 646 over I-80?

It is owned by the State Highway Agency.