US Bridges

Il 121 (fap 320) over Jonathan Creek

Good

Moultrie County, Illinois · 3 MI E of Sullivan · Structure no. 070000300000000

Built
1967
58 years old
Condition
Good
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
223 ft
3 main spans
Daily traffic
5,700
2023 count
Owner
State
State Highway Agency

About this bridge

Il 121 (fap 320) over Jonathan Creek is a steel continuous stringer/multi-beam or girder carrying Il 121 (fap 320) over Jonathan Creek in Moultrie County, Illinois. It was built in 1967, so it is 58 years old, older than the Illinois average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 5,700 vehicles a day, roughly 14% of them trucks, projected to reach 5,828 by 2046. The structure is 223 ft (68 m) long and 43 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesIl 121 (fap 320)
CrossesJonathan Creek
Location3 MI E of Sullivan
RouteState Highway 121
CountyMoultrie County
StateIllinois
Coordinates39.6008, -88.54674
Functional classRural Principal Arterial - Other

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
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 rating58.5 US tons
Inventory rating45 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length223 ft (68 m)
Longest span84 ft (25.7 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,700 (2023)
Projected traffic5,828 by 2046
Trucks14%
Lanes on structure2
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.1 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Il 121 (fap 320) over Jonathan Creek built?

It was built in 1967, making it 58 years old in 2025.

What condition is Il 121 (fap 320) over Jonathan Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2023.

How much traffic does Il 121 (fap 320) over Jonathan Creek carry?

About 5,700 vehicles per day (2023 count), of which roughly 14% are trucks.

How long is Il 121 (fap 320) over Jonathan Creek?

The structure is 223 ft (68 m) long with a longest span of 84 ft (25.7 m) and a deck 43 ft wide.

Who owns Il 121 (fap 320) over Jonathan Creek?

It is owned by the State Highway Agency.