US Bridges

Ch 5 over South Forksaline

Good

Williamson County, Illinois · 6 MI Southill RTE 13 · Structure no. 100311100000000

Built
1983
42 years old
Condition
Good
inspected February 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
152 ft
3 main spans
Daily traffic
50
2021 count
Owner
County
County Highway Agency

About this bridge

Ch 5 over South Forksaline is a prestressed concrete box beam or girders - multiple carrying Ch 5 over South Forksaline in Williamson 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 50 vehicles a day, roughly 26% of them trucks, projected to reach 51 by 2046. The structure is 152 ft (46.3 m) long and 29 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

CarriesCh 5
CrossesSouth Forksaline
Location6 MI Southill RTE 13
RouteCounty Highway 0
Coordinates37.65863, -88.72166
Functional classRural Minor Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating68.2 US tons
Inventory rating40.7 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length152 ft (46.3 m)
Longest span50 ft (15.2 m)
Deck width29 ft (8.7 m)
Roadway width29 ft (8.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2021)
Projected traffic51 by 2046
Trucks26%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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 5 over South Forksaline built?

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

What condition is Ch 5 over South Forksaline in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in February 2023.

How much traffic does Ch 5 over South Forksaline carry?

About 50 vehicles per day (2021 count), of which roughly 26% are trucks.

How long is Ch 5 over South Forksaline?

The structure is 152 ft (46.3 m) long with a longest span of 50 ft (15.2 m) and a deck 29 ft wide.

Who owns Ch 5 over South Forksaline?

It is owned by the County Highway Agency.