US Bridges

FAP 320(IL 121) over Long Creek

Fair

Macon County, Illinois · 1.5 MI N Mt Zion · Structure no. 058005500000000

Built
1975
50 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
228 ft
3 main spans
Daily traffic
12,600
2023 count
Owner
State
State Highway Agency

About this bridge

FAP 320(IL 121) over Long Creek is a steel continuous stringer/multi-beam or girder carrying FAP 320(IL 121) over Long Creek in Macon County, Illinois. It was built in 1975, so it is 50 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 12,600 vehicles a day, roughly 6% of them trucks, projected to reach 12,221 by 2046. The structure is 228 ft (69.5 m) long and 85 ft wide.

Location

Open in Google Maps
CarriesFAP 320(IL 121)
CrossesLong Creek
Location1.5 MI N Mt Zion
RouteState Highway 121
CountyMacon County
StateIllinois
Coordinates39.80166, -88.87629
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 above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating90.4 US tons
Inventory rating47.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length228 ft (69.5 m)
Longest span82 ft (25.1 m)
Deck width85 ft (26 m)
Roadway width66 ft (20.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,600 (2023)
Projected traffic12,221 by 2046
Trucks6%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$2.7 million
NavigationNo navigation control on waterway

Frequently asked questions

When was FAP 320(IL 121) over Long Creek built?

It was built in 1975, making it 50 years old in 2025.

What condition is FAP 320(IL 121) over Long 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) over Long Creek carry?

About 12,600 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is FAP 320(IL 121) over Long Creek?

The structure is 228 ft (69.5 m) long with a longest span of 82 ft (25.1 m) and a deck 85 ft wide.

Who owns FAP 320(IL 121) over Long Creek?

It is owned by the State Highway Agency.