US Bridges

Ch 4 (fas 537) over Trenkle Slough

Fair

De Witt County, Illinois · .8 MI S Farmer City · Structure no. 020300200000000

Built
1968
57 years old
Condition
Fair
inspected April 2022
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
129 ft
3 main spans
Daily traffic
1,200
2022 count
Owner
County
County Highway Agency

About this bridge

Ch 4 (fas 537) over Trenkle Slough is a prestressed concrete box beam or girders - multiple carrying Ch 4 (fas 537) over Trenkle Slough in De Witt County, Illinois. It was built in 1968, so it is 57 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 1,200 vehicles a day, roughly 9% of them trucks, projected to reach 1,313 by 2046. The structure is 129 ft (39.4 m) long and 28 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

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CarriesCh 4 (fas 537)
CrossesTrenkle Slough
Location.8 MI S Farmer City
RouteCounty Highway 0
CountyDe Witt County
StateIllinois
Coordinates40.23265, -88.6414
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2022
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 alignment7: Better than present minimum criteria
Operating rating40.7 US tons
Inventory rating24.3 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length129 ft (39.4 m)
Longest span42 ft (12.7 m)
Deck width28 ft (8.5 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,200 (2022)
Projected traffic1,313 by 2046
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 4 (fas 537) over Trenkle Slough built?

It was built in 1968, making it 57 years old in 2025.

What condition is Ch 4 (fas 537) over Trenkle 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 April 2022.

How much traffic does Ch 4 (fas 537) over Trenkle Slough carry?

About 1,200 vehicles per day (2022 count), of which roughly 9% are trucks.

How long is Ch 4 (fas 537) over Trenkle Slough?

The structure is 129 ft (39.4 m) long with a longest span of 42 ft (12.7 m) and a deck 28 ft wide.

Who owns Ch 4 (fas 537) over Trenkle Slough?

It is owned by the County Highway Agency.