US Bridges

FAI-57 NB over Rock CR

Fair

Kankakee County, Illinois · 4.6 MI N of Ill 50 · Structure no. 046001900000000

Built
1964
61 years old, rebuilt 1996
Condition
Fair
inspected January 2024
Type
Slab
Concrete Continuous
Length
99 ft
3 main spans
Daily traffic
13,700
2023 count
Owner
State
State Highway Agency

About this bridge

FAI-57 NB over Rock CR is a concrete continuous slab carrying FAI-57 NB over Rock CR in Kankakee County, Illinois. It was built in 1964 and reconstructed in 1996, so it is 61 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 13,700 vehicles a day, roughly 31% of them trucks, projected to reach 16,677 by 2046. The structure is 99 ft (30.2 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesFAI-57 NB
CrossesRock CR
Location4.6 MI N of Ill 50
RouteInterstate 57
CountyKankakee County
StateIllinois
Coordinates41.22652, -87.86361
Functional classUrban Principal Arterial - Interstate

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating68.9 US tons
Inventory rating41.4 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length99 ft (30.2 m)
Longest span37 ft (11.3 m)
Deck width44 ft (13.5 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,700 (2023)
Projected traffic16,677 by 2046
Trucks31%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 FAI-57 NB over Rock CR built?

It was built in 1964, making it 61 years old in 2025. It was reconstructed in 1996.

What condition is FAI-57 NB over Rock CR 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 2024.

How much traffic does FAI-57 NB over Rock CR carry?

About 13,700 vehicles per day (2023 count), of which roughly 31% are trucks.

How long is FAI-57 NB over Rock CR?

The structure is 99 ft (30.2 m) long with a longest span of 37 ft (11.3 m) and a deck 44 ft wide.

Who owns FAI-57 NB over Rock CR?

It is owned by the State Highway Agency.