US Bridges

FAP 320(IL 121 & 4 over Spring Creek

Fair

Macon County, Illinois · In Decatur · Structure no. 058005000000000

Built
1971
54 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
174 ft
3 main spans
Daily traffic
17,900
2023 count
Owner
State
State Highway Agency

About this bridge

FAP 320(IL 121 & 4 over Spring Creek is a steel continuous stringer/multi-beam or girder carrying FAP 320(IL 121 & 4 over Spring Creek in Macon County, Illinois. It was built in 1971, so it is 54 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 17,900 vehicles a day, roughly 4% of them trucks, projected to reach 17,877 by 2046. The structure is 174 ft (52.9 m) long and 82 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesFAP 320(IL 121 & 4
CrossesSpring Creek
LocationIn Decatur
RouteState Highway 48
CountyMacon County
StateIllinois
Coordinates39.87645, -88.96096
Functional classUrban Other Principal Arterial

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating68.6 US tons
Inventory rating41.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length174 ft (52.9 m)
Longest span65 ft (19.9 m)
Deck width82 ft (25 m)
Roadway width54 ft (16.5 m)
Vertical clearance over deck14 ft (4.2 m)

Traffic and service

Average daily traffic17,900 (2023)
Projected traffic17,877 by 2046
Trucks4%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

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 FAP 320(IL 121 & 4 over Spring Creek built?

It was built in 1971, making it 54 years old in 2025.

What condition is FAP 320(IL 121 & 4 over Spring Creek 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 August 2024.

How much traffic does FAP 320(IL 121 & 4 over Spring Creek carry?

About 17,900 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is FAP 320(IL 121 & 4 over Spring Creek?

The structure is 174 ft (52.9 m) long with a longest span of 65 ft (19.9 m) and a deck 82 ft wide.

Who owns FAP 320(IL 121 & 4 over Spring Creek?

It is owned by the State Highway Agency.