US Bridges

IL15 Ramp G to SB2 over Il 163

Fair

St. Clair County, Illinois · 0.2MI S of Il 15 · Structure no. 082026000000000

Built
1979
46 years old
Condition
Fair
inspected January 2025
Type
Stringer/Multi-beam or Girder
Steel
Length
120 ft
1 main span
Daily traffic
850
2024 count
Owner
State
State Highway Agency

About this bridge

IL15 Ramp G to SB2 over Il 163 is a steel stringer/multi-beam or girder carrying IL15 Ramp G to SB2 over Il 163 in St. Clair County, Illinois. It was built in 1979, so it is 46 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 850 vehicles a day, roughly 12% of them trucks, projected to reach 1,111 by 2046. The structure is 120 ft (36.5 m) long and 29 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesIL15 Ramp G to SB2
CrossesIl 163
Location0.2MI S of Il 15
CountySt. Clair County
StateIllinois
Coordinates38.58123, -90.1109
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.2 US tons
Inventory rating37.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadHS 20
Structure length120 ft (36.5 m)
Longest span118 ft (36 m)
Deck width29 ft (8.9 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic850 (2024)
Projected traffic1,111 by 2046
Trucks12%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was IL15 Ramp G to SB2 over Il 163 built?

It was built in 1979, making it 46 years old in 2025.

What condition is IL15 Ramp G to SB2 over Il 163 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 January 2025.

How much traffic does IL15 Ramp G to SB2 over Il 163 carry?

About 850 vehicles per day (2024 count), of which roughly 12% are trucks.

How long is IL15 Ramp G to SB2 over Il 163?

The structure is 120 ft (36.5 m) long with a longest span of 118 ft (36 m) and a deck 29 ft wide.

Who owns IL15 Ramp G to SB2 over Il 163?

It is owned by the State Highway Agency.