US Bridges

FAS-805 (SBI-142) over Big Slough

Good

Lawrence County, Illinois · .7 MI E ILL-1 · Structure no. 051200500000000

Built
2000
25 years old
Condition
Good
inspected January 2025
Type
Culvert
Concrete
Length
38 ft
3 main spans
Daily traffic
900
2023 count
Owner
State
State Highway Agency

About this bridge

FAS-805 (SBI-142) over Big Slough is a concrete culvert carrying FAS-805 (SBI-142) over Big Slough in Lawrence County, Illinois. It was built in 2000, so it is 25 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 900 vehicles a day, roughly 7% of them trucks, projected to reach 1,061 by 2046. The structure is 38 ft (11.5 m) long and 62 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesFAS-805 (SBI-142)
CrossesBig Slough
Location.7 MI E ILL-1
RouteCounty Highway 0
CountyLawrence County
StateIllinois
Coordinates38.59041, -87.68291
Functional classRural Major Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert7 GoodSome minor problems.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating82.5 US tons
Inventory rating49.6 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 20
Structure length38 ft (11.5 m)
Longest span12 ft (3.7 m)
Deck width62 ft (18.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic900 (2023)
Projected traffic1,061 by 2046
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was FAS-805 (SBI-142) over Big Slough built?

It was built in 2000, making it 25 years old in 2025.

What condition is FAS-805 (SBI-142) over Big Slough 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 January 2025.

How much traffic does FAS-805 (SBI-142) over Big Slough carry?

About 900 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is FAS-805 (SBI-142) over Big Slough?

The structure is 38 ft (11.5 m) long with a longest span of 12 ft (3.7 m) and a deck 62 ft wide.

Who owns FAS-805 (SBI-142) over Big Slough?

It is owned by the State Highway Agency.