US Bridges

FAS 1631(CH 9) over Flat Branch

Fair

Shelby County, Illinois · 0.4 MI S of Sexon · Structure no. 087501100000000

Built
1937
88 years old
Condition
Fair
inspected March 2024
Type
Culvert
Concrete
Length
38 ft
3 main spans
Daily traffic
375
2024 count
Owner
County
County Highway Agency

About this bridge

FAS 1631(CH 9) over Flat Branch is a concrete culvert carrying FAS 1631(CH 9) over Flat Branch in Shelby County, Illinois. It was built in 1937, so it is 88 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 375 vehicles a day, roughly 10% of them trucks, projected to reach 354 by 2046. The structure is 38 ft (11.5 m) long. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesFAS 1631(CH 9)
CrossesFlat Branch
Location0.4 MI S of Sexon
RouteCounty Highway 0
CountyShelby County
StateIllinois
Coordinates39.3806, -88.51815
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
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMarch 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
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating44.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadUnknown
Structure length38 ft (11.5 m)
Longest span11 ft (3.4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic375 (2024)
Projected traffic354 by 2046
Trucks10%
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 1631(CH 9) over Flat Branch built?

It was built in 1937, making it 88 years old in 2025.

What condition is FAS 1631(CH 9) over Flat Branch 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 March 2024.

How much traffic does FAS 1631(CH 9) over Flat Branch carry?

About 375 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is FAS 1631(CH 9) over Flat Branch?

The structure is 38 ft (11.5 m) long with a longest span of 11 ft (3.4 m).

Who owns FAS 1631(CH 9) over Flat Branch?

It is owned by the County Highway Agency.