US Bridges

I-39/US 51(NB) over Sandy Creek

Fair

Marshall County, Illinois · 2.61 MI S of Ill 18 · Structure no. 062004300000000

Built
1990
35 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
95 ft
3 main spans
Daily traffic
8,250
2023 count
Owner
State
State Highway Agency

About this bridge

I-39/US 51(NB) over Sandy Creek is a prestressed concrete continuous stringer/multi-beam or girder carrying I-39/US 51(NB) over Sandy Creek in Marshall County, Illinois. It was built in 1990, so it is 35 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 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 8,250 vehicles a day, roughly 39% of them trucks, projected to reach 7,323 by 2046. The structure is 95 ft (29.1 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-39/US 51(NB)
CrossesSandy Creek
Location2.61 MI S of Ill 18
RouteInterstate 39
CountyMarshall County
StateIllinois
Coordinates41.08291, -89.0671
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating97.1 US tons
Inventory rating59.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length95 ft (29.1 m)
Longest span32 ft (9.7 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,250 (2023)
Projected traffic7,323 by 2046
Trucks39%
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-39/US 51(NB) over Sandy Creek built?

It was built in 1990, making it 35 years old in 2025.

What condition is I-39/US 51(NB) over Sandy 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 March 2023.

How much traffic does I-39/US 51(NB) over Sandy Creek carry?

About 8,250 vehicles per day (2023 count), of which roughly 39% are trucks.

How long is I-39/US 51(NB) over Sandy Creek?

The structure is 95 ft (29.1 m) long with a longest span of 32 ft (9.7 m) and a deck 43 ft wide.

Who owns I-39/US 51(NB) over Sandy Creek?

It is owned by the State Highway Agency.