US Bridges

NB I-294 over Flagg Creek

Good

Cook County, Illinois · 0.9 M S US 34 · Structure no. 016963200000000

Built
2023
2 years old
Condition
Good
inspected December 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
80 ft
1 main span
Daily traffic
89,000
2023 count
Owner
Toll Authority
State Toll Authority

About this bridge

NB I-294 over Flagg Creek is a prestressed concrete stringer/multi-beam or girder carrying NB I-294 over Flagg Creek in Cook County, Illinois. It was built in 2023, so it is 2 years old, younger 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 89,000 vehicles a day, roughly 19% of them trucks, projected to reach 255,760 by 2040. The structure is 80 ft (24.3 m) long and 107 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesNB I-294
CrossesFlagg Creek
Location0.9 M S US 34
RouteInterstate 294
CountyCook County
StateIllinois
Coordinates41.80537, -87.91156
Functional classUrban Principal Arterial - Interstate

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.
Superstructure9 ExcellentNo problems noted.
Substructure9 ExcellentNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation*: *
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating—
Inventory rating—

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length80 ft (24.3 m)
Longest span72 ft (21.9 m)
Deck width107 ft (32.6 m)
Roadway width104 ft (31.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic89,000 (2023)
Projected traffic255,760 by 2040
Trucks19%
Lanes on structure7
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a toll road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Toll Authority
Maintained byState Toll Authority
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was NB I-294 over Flagg Creek built?

It was built in 2023, making it 2 years old in 2025.

What condition is NB I-294 over Flagg 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 December 2023.

How much traffic does NB I-294 over Flagg Creek carry?

About 89,000 vehicles per day (2023 count), of which roughly 19% are trucks.

How long is NB I-294 over Flagg Creek?

The structure is 80 ft (24.3 m) long with a longest span of 72 ft (21.9 m) and a deck 107 ft wide.

Who owns NB I-294 over Flagg Creek?

It is owned by the State Toll Authority.