US Bridges

Il 16 over I-55

Fair

Montgomery County, Illinois · Litchfield Interchng · Structure no. 068005100000000

Built
1973
52 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
331 ft
2 main spans
Daily traffic
4,650
2023 count
Owner
State
State Highway Agency

About this bridge

Il 16 over I-55 is a steel stringer/multi-beam or girder carrying Il 16 over I-55 in Montgomery County, Illinois. It was built in 1973, so it is 52 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 4,650 vehicles a day, roughly 7% of them trucks, projected to reach 5,202 by 2046. The structure is 331 ft (100.9 m) long and 107 ft wide. If it were closed, the detour would be 24.9 mi (40 km).

Location

Open in Google Maps
CarriesIl 16
CrossesI-55
LocationLitchfield Interchng
RouteState Highway 16
CountyMontgomery County
StateIllinois
Coordinates39.1753, -89.68158
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating107.1 US tons
Inventory rating59.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2 (+2 approach)
Design loadHS 20
Structure length331 ft (100.9 m)
Longest span111 ft (33.7 m)
Deck width107 ft (32.5 m)
Roadway width89 ft (27.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,650 (2023)
Projected traffic5,202 by 2046
Trucks7%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed24.9 mi (40 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Il 16 over I-55 built?

It was built in 1973, making it 52 years old in 2025.

What condition is Il 16 over I-55 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 August 2024.

How much traffic does Il 16 over I-55 carry?

About 4,650 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is Il 16 over I-55?

The structure is 331 ft (100.9 m) long with a longest span of 111 ft (33.7 m) and a deck 107 ft wide.

Who owns Il 16 over I-55?

It is owned by the State Highway Agency.