US Bridges

FAS 470-CH 6 over Sargent Slough

Fair

Tazewell County, Illinois · N.CTR-29-T24NR2W · Structure no. 090320200000000

Built
1986
39 years old
Condition
Fair
inspected January 2025
Type
Slab
Concrete Continuous
Length
83 ft
3 main spans
Daily traffic
1,100
2023 count
Owner
County
County Highway Agency

About this bridge

FAS 470-CH 6 over Sargent Slough is a concrete continuous slab carrying FAS 470-CH 6 over Sargent Slough in Tazewell County, Illinois. It was built in 1986, so it is 39 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 6 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 1,100 vehicles a day, roughly 15% of them trucks, projected to reach 909 by 2046. The structure is 83 ft (25.3 m) long and 32 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesFAS 470-CH 6
CrossesSargent Slough
LocationN.CTR-29-T24NR2W
RouteCounty Highway 0
CountyTazewell County
StateIllinois
Coordinates40.50943, -89.35276
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.9 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length83 ft (25.3 m)
Longest span30 ft (9.1 m)
Deck width32 ft (9.8 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,100 (2023)
Projected traffic909 by 2046
Trucks15%
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

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 FAS 470-CH 6 over Sargent Slough built?

It was built in 1986, making it 39 years old in 2025.

What condition is FAS 470-CH 6 over Sargent 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 2025.

How much traffic does FAS 470-CH 6 over Sargent Slough carry?

About 1,100 vehicles per day (2023 count), of which roughly 15% are trucks.

How long is FAS 470-CH 6 over Sargent Slough?

The structure is 83 ft (25.3 m) long with a longest span of 30 ft (9.1 m) and a deck 32 ft wide.

Who owns FAS 470-CH 6 over Sargent Slough?

It is owned by the County Highway Agency.