US Bridges

US 12 20 45 NB over S&s & Im Cnls&icg RR

Fair

Cook County, Illinois · 0.9 M S I-55 · Structure no. 016246800000000

Built
1976
49 years old, rebuilt 2022
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
1,344 ft
13 main spans
Daily traffic
77,700
2019 count
Owner
State
State Highway Agency

About this bridge

US 12 20 45 NB over S&s & Im Cnls&icg RR is a steel continuous stringer/multi-beam or girder carrying US 12 20 45 NB over S&s & Im Cnls&icg RR in Cook County, Illinois. It was built in 1976 and reconstructed in 2022, so it is 49 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 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 77,700 vehicles a day, roughly 10% of them trucks, projected to reach 39,239 by 2046. The structure is 1,344 ft (409.7 m) long and 42 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesUS 12 20 45 NB
CrossesS&s & Im Cnls&icg RR
Location0.9 M S I-55
RouteU.S. Route 12
CountyCook County
StateIllinois
Coordinates41.74782, -87.85573
Functional classUrban Other Principal 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
Deck8 Very GoodNo problems noted.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating85.3 US tons
Inventory rating45 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans13
Design loadHS 20
Structure length1,344 ft (409.7 m)
Longest span180 ft (54.9 m)
Deck width42 ft (12.8 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic77,700 (2019)
Projected traffic39,239 by 2046
Trucks10%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad and waterway
Detour if closed6.2 mi (10 km)
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 proposedNone recorded
Estimated improvement cost—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was US 12 20 45 NB over S&s & Im Cnls&icg RR built?

It was built in 1976, making it 49 years old in 2025. It was reconstructed in 2022.

What condition is US 12 20 45 NB over S&s & Im Cnls&icg RR 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 May 2024.

How much traffic does US 12 20 45 NB over S&s & Im Cnls&icg RR carry?

About 77,700 vehicles per day (2019 count), of which roughly 10% are trucks.

How long is US 12 20 45 NB over S&s & Im Cnls&icg RR?

The structure is 1,344 ft (409.7 m) long with a longest span of 180 ft (54.9 m) and a deck 42 ft wide.

Who owns US 12 20 45 NB over S&s & Im Cnls&icg RR?

It is owned by the State Highway Agency.