US Bridges

I-74 (wb) over S Branch Salt Creek

Fair

Piatt County, Illinois · 1.5 MI E of US 54 · Structure no. 074003800000000

Built
1970
55 years old
Condition
Fair
inspected December 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
117 ft
3 main spans
Daily traffic
10,750
2023 count
Owner
State
State Highway Agency

About this bridge

I-74 (wb) over S Branch Salt Creek is a steel continuous stringer/multi-beam or girder carrying I-74 (wb) over S Branch Salt Creek in Piatt County, Illinois. It was built in 1970, so it is 55 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 10,750 vehicles a day, roughly 33% of them trucks, projected to reach 11,565 by 2046. The structure is 117 ft (35.8 m) long and 42 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-74 (wb)
CrossesS Branch Salt Creek
Location1.5 MI E of US 54
RouteInterstate 74
CountyPiatt County
StateIllinois
Coordinates40.23757, -88.6049
Functional classRural Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66 US tons
Inventory rating39.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length117 ft (35.8 m)
Longest span41 ft (12.6 m)
Deck width42 ft (12.8 m)
Roadway width38 ft (11.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,750 (2023)
Projected traffic11,565 by 2046
Trucks33%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 I-74 (wb) over S Branch Salt Creek built?

It was built in 1970, making it 55 years old in 2025.

What condition is I-74 (wb) over S Branch Salt 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 December 2023.

How much traffic does I-74 (wb) over S Branch Salt Creek carry?

About 10,750 vehicles per day (2023 count), of which roughly 33% are trucks.

How long is I-74 (wb) over S Branch Salt Creek?

The structure is 117 ft (35.8 m) long with a longest span of 41 ft (12.6 m) and a deck 42 ft wide.

Who owns I-74 (wb) over S Branch Salt Creek?

It is owned by the State Highway Agency.