US Bridges

Il 100 (nb) over Piasa Creek

Fair

Jersey County, Illinois · .7 MI N Clifton Terr · Structure no. 042002300000000

Built
1997
28 years old
Condition
Fair
inspected February 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
255 ft
3 main spans
Daily traffic
5,150
2023 count
Owner
State
State Highway Agency

About this bridge

Il 100 (nb) over Piasa Creek is a prestressed concrete stringer/multi-beam or girder carrying Il 100 (nb) over Piasa Creek in Jersey County, Illinois. It was built in 1997, so it is 28 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 5,150 vehicles a day, roughly 7% of them trucks, projected to reach 2,550 by 2046. The structure is 255 ft (77.7 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesIl 100 (nb)
CrossesPiasa Creek
Location.7 MI N Clifton Terr
RouteState Highway 100
CountyJersey County
StateIllinois
Coordinates38.93902, -90.2889
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionFebruary 2023
Inspection intervalevery 48 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 rating80.7 US tons
Inventory rating48.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length255 ft (77.7 m)
Longest span85 ft (25.8 m)
Deck width44 ft (13.5 m)
Roadway width41 ft (12.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,150 (2023)
Projected traffic2,550 by 2046
Trucks7%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 100 (nb) over Piasa Creek built?

It was built in 1997, making it 28 years old in 2025.

What condition is Il 100 (nb) over Piasa 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 February 2023.

How much traffic does Il 100 (nb) over Piasa Creek carry?

About 5,150 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is Il 100 (nb) over Piasa Creek?

The structure is 255 ft (77.7 m) long with a longest span of 85 ft (25.8 m) and a deck 44 ft wide.

Who owns Il 100 (nb) over Piasa Creek?

It is owned by the State Highway Agency.