US Bridges

Il 394 NB over Plum Creek

Good

Will County, Illinois · 9.2 M S of US 30 · Structure no. 099014700000000

Built
1949
76 years old, rebuilt 2010
Condition
Good
inspected September 2021
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
121 ft
3 main spans
Daily traffic
10,600
2023 count
Owner
State
State Highway Agency

About this bridge

Il 394 NB over Plum Creek is a steel continuous stringer/multi-beam or girder carrying Il 394 NB over Plum Creek in Will County, Illinois. It was built in 1949 and reconstructed in 2010, so it is 76 years old, older than the Illinois average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 10,600 vehicles a day, roughly 20% of them trucks, projected to reach 6,048 by 2046. The structure is 121 ft (36.9 m) long and 38 ft wide.

Location

Open in Google Maps
CarriesIl 394 NB
CrossesPlum Creek
Location9.2 M S of US 30
RouteState Highway 1
CountyWill County
StateIllinois
Coordinates41.39247, -87.62677
Functional classUrban Other Principal Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating98.2 US tons
Inventory rating75.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length121 ft (36.9 m)
Longest span48 ft (14.6 m)
Deck width38 ft (11.6 m)
Roadway width35 ft (10.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,600 (2023)
Projected traffic6,048 by 2046
Trucks20%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$860,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Il 394 NB over Plum Creek built?

It was built in 1949, making it 76 years old in 2025. It was reconstructed in 2010.

What condition is Il 394 NB over Plum Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2021.

How much traffic does Il 394 NB over Plum Creek carry?

About 10,600 vehicles per day (2023 count), of which roughly 20% are trucks.

How long is Il 394 NB over Plum Creek?

The structure is 121 ft (36.9 m) long with a longest span of 48 ft (14.6 m) and a deck 38 ft wide.

Who owns Il 394 NB over Plum Creek?

It is owned by the State Highway Agency.