US Bridges

Il 121 (fap 320) over Marrowbone Creek

Fair

Moultrie County, Illinois · 2 MI S. Dalton City · Structure no. 070005000000000

Built
2012
13 years old
Condition
Fair
inspected September 2022
Type
Stringer/Multi-beam or Girder
Steel
Length
94 ft
1 main span
Daily traffic
4,350
2023 count
Owner
State
State Highway Agency

About this bridge

Il 121 (fap 320) over Marrowbone Creek is a steel stringer/multi-beam or girder carrying Il 121 (fap 320) over Marrowbone Creek in Moultrie County, Illinois. It was built in 2012, so it is 13 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 6 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 4,350 vehicles a day, roughly 12% of them trucks, projected to reach 4,830 by 2046. The structure is 94 ft (28.7 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesIl 121 (fap 320)
CrossesMarrowbone Creek
Location2 MI S. Dalton City
RouteState Highway 121
CountyMoultrie County
StateIllinois
Coordinates39.68082, -88.77424
Functional classRural Principal Arterial - Other

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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating58.5 US tons
Inventory rating45.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length94 ft (28.7 m)
Longest span92 ft (27.9 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,350 (2023)
Projected traffic4,830 by 2046
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 Il 121 (fap 320) over Marrowbone Creek built?

It was built in 2012, making it 13 years old in 2025.

What condition is Il 121 (fap 320) over Marrowbone 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 September 2022.

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

About 4,350 vehicles per day (2023 count), of which roughly 12% are trucks.

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

The structure is 94 ft (28.7 m) long with a longest span of 92 ft (27.9 m) and a deck 43 ft wide.

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

It is owned by the State Highway Agency.