US Bridges

FAS 644 over Sangamon River

Fair

Christian County, Illinois · 5.5 M Ene Mt Auburn · Structure no. 011328300000000

Built
1980
45 years old
Condition
Fair
inspected November 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
491 ft
5 main spans
Daily traffic
550
2021 count
Owner
County
County Highway Agency

About this bridge

FAS 644 over Sangamon River is a prestressed concrete box beam or girders - multiple carrying FAS 644 over Sangamon River in Christian County, Illinois. It was built in 1980, so it is 45 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 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 550 vehicles a day, roughly 16% of them trucks, projected to reach 556 by 2046. The structure is 491 ft (149.7 m) long and 31 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesFAS 644
CrossesSangamon River
Location5.5 M Ene Mt Auburn
RouteCounty Highway 0
CountyChristian County
StateIllinois
Coordinates39.80302, -89.15622
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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56.4 US tons
Inventory rating34 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length491 ft (149.7 m)
Longest span97 ft (29.6 m)
Deck width31 ft (9.4 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic550 (2021)
Projected traffic556 by 2046
Trucks16%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 644 over Sangamon River built?

It was built in 1980, making it 45 years old in 2025.

What condition is FAS 644 over Sangamon River 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 November 2023.

How much traffic does FAS 644 over Sangamon River carry?

About 550 vehicles per day (2021 count), of which roughly 16% are trucks.

How long is FAS 644 over Sangamon River?

The structure is 491 ft (149.7 m) long with a longest span of 97 ft (29.6 m) and a deck 31 ft wide.

Who owns FAS 644 over Sangamon River?

It is owned by the County Highway Agency.