US Bridges

Il 4 over Trib to Mud Creek

Fair

St. Clair County, Illinois · 3.5 M N JCT 13 · Structure no. 082008300000000

Built
1928
97 years old
Condition
Fair
inspected October 2023
Type
Slab
Concrete
Length
26 ft
1 main span
Daily traffic
2,050
2023 count
Owner
State
State Highway Agency

About this bridge

Il 4 over Trib to Mud Creek is a concrete slab carrying Il 4 over Trib to Mud Creek in St. Clair County, Illinois. It was built in 1928, so it is 97 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 2,050 vehicles a day, roughly 18% of them trucks, projected to reach 2,424 by 2046. The structure is 26 ft (7.9 m) long and 32 ft wide. If it were closed, the detour would be 39.1 mi (63 km).

Location

Open in Google Maps
CarriesIl 4
CrossesTrib to Mud Creek
Location3.5 M N JCT 13
RouteState Highway 4
CountySt. Clair County
StateIllinois
Coordinates38.29464, -89.72202
Functional classRural Minor 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59 US tons
Inventory rating35.4 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length26 ft (7.9 m)
Longest span23 ft (7 m)
Deck width32 ft (9.8 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,050 (2023)
Projected traffic2,424 by 2046
Trucks18%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed39.1 mi (63 km)
TollOn a free road
National Highway SystemNo

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 4 over Trib to Mud Creek built?

It was built in 1928, making it 97 years old in 2025.

What condition is Il 4 over Trib to Mud 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 October 2023.

How much traffic does Il 4 over Trib to Mud Creek carry?

About 2,050 vehicles per day (2023 count), of which roughly 18% are trucks.

How long is Il 4 over Trib to Mud Creek?

The structure is 26 ft (7.9 m) long with a longest span of 23 ft (7 m) and a deck 32 ft wide.

Who owns Il 4 over Trib to Mud Creek?

It is owned by the State Highway Agency.