US Bridges

Ch 18(FAS 528) over Black Slough

Fair

Champaign County, Illinois · 1 MI W of Philo · Structure no. 010024500000000

Built
1983
42 years old
Condition
Fair
inspected January 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
64 ft
1 main span
Daily traffic
2,650
2021 count
Owner
County
County Highway Agency

About this bridge

Ch 18(FAS 528) over Black Slough is a prestressed concrete box beam or girders - multiple carrying Ch 18(FAS 528) over Black Slough in Champaign County, Illinois. It was built in 1983, so it is 42 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 2,650 vehicles a day, roughly 9% of them trucks, projected to reach 2,677 by 2046. The structure is 64 ft (19.5 m) long and 30 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesCh 18(FAS 528)
CrossesBlack Slough
Location1 MI W of Philo
RouteCounty Highway 0
CountyChampaign County
StateIllinois
Coordinates40.01088, -88.18289
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
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 protection7 GoodSome minor problems.
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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating49.3 US tons
Inventory rating29.3 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length64 ft (19.5 m)
Longest span60 ft (18.3 m)
Deck width30 ft (9.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,650 (2021)
Projected traffic2,677 by 2046
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Ch 18(FAS 528) over Black Slough built?

It was built in 1983, making it 42 years old in 2025.

What condition is Ch 18(FAS 528) over Black Slough 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 Ch 18(FAS 528) over Black Slough carry?

About 2,650 vehicles per day (2021 count), of which roughly 9% are trucks.

How long is Ch 18(FAS 528) over Black Slough?

The structure is 64 ft (19.5 m) long with a longest span of 60 ft (18.3 m) and a deck 30 ft wide.

Who owns Ch 18(FAS 528) over Black Slough?

It is owned by the County Highway Agency.