US Bridges

US 12 45 Mannheim over Il 64 (north Ave)

Fair

Cook County, Illinois · 0.7 M N US 20 · Structure no. 016033600000000

Built
1931
94 years old, rebuilt 1975
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
107 ft
2 main spans
Daily traffic
38,900
2023 count
Owner
State
State Highway Agency

About this bridge

US 12 45 Mannheim over Il 64 (north Ave) is a steel continuous stringer/multi-beam or girder carrying US 12 45 Mannheim over Il 64 (north Ave) in Cook County, Illinois. It was built in 1931 and reconstructed in 1975, so it is 94 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 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 38,900 vehicles a day, roughly 11% of them trucks, projected to reach 36,865 by 2046. The structure is 107 ft (32.5 m) long and 102 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesUS 12 45 Mannheim
CrossesIl 64 (north Ave)
Location0.7 M N US 20
RouteU.S. Route 12
CountyCook County
StateIllinois
Coordinates41.90666, -87.88378
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating78.6 US tons
Inventory rating44 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length107 ft (32.5 m)
Longest span51 ft (15.5 m)
Deck width102 ft (31.1 m)
Roadway width78 ft (23.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic38,900 (2023)
Projected traffic36,865 by 2046
Trucks11%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed1.2 mi (2 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 proposedDeck rehabilitation with only incidental widening
Estimated improvement cost$829,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was US 12 45 Mannheim over Il 64 (north Ave) built?

It was built in 1931, making it 94 years old in 2025. It was reconstructed in 1975.

What condition is US 12 45 Mannheim over Il 64 (north Ave) 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 October 2024.

How much traffic does US 12 45 Mannheim over Il 64 (north Ave) carry?

About 38,900 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is US 12 45 Mannheim over Il 64 (north Ave)?

The structure is 107 ft (32.5 m) long with a longest span of 51 ft (15.5 m) and a deck 102 ft wide.

Who owns US 12 45 Mannheim over Il 64 (north Ave)?

It is owned by the State Highway Agency.