US Bridges

Il 4 over S1 Trib L Silver Crk

Good

St. Clair County, Illinois · 1.1 MI S of US 50 · Structure no. 082030100000000

Built
1998
27 years old
Condition
Good
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
85 ft
2 main spans
Daily traffic
6,050
2023 count
Owner
State
State Highway Agency

About this bridge

Il 4 over S1 Trib L Silver Crk is a steel continuous stringer/multi-beam or girder carrying Il 4 over S1 Trib L Silver Crk in St. Clair County, Illinois. It was built in 1998, so it is 27 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 6,050 vehicles a day, roughly 19% of them trucks, projected to reach 6,060 by 2046. The structure is 85 ft (26 m) long and 43 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

Location

Open in Google Maps
CarriesIl 4
CrossesS1 Trib L Silver Crk
Location1.1 MI S of US 50
RouteState Highway 4
CountySt. Clair County
StateIllinois
Coordinates38.5796, -89.80777
Functional classUrban Other Principal Arterial

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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating88.2 US tons
Inventory rating52.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length85 ft (26 m)
Longest span45 ft (13.7 m)
Deck width43 ft (13 m)
Roadway width39 ft (12 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,050 (2023)
Projected traffic6,060 by 2046
Trucks19%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.3 mi (23 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 Il 4 over S1 Trib L Silver Crk built?

It was built in 1998, making it 27 years old in 2025.

What condition is Il 4 over S1 Trib L Silver Crk 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 October 2023.

How much traffic does Il 4 over S1 Trib L Silver Crk carry?

About 6,050 vehicles per day (2023 count), of which roughly 19% are trucks.

How long is Il 4 over S1 Trib L Silver Crk?

The structure is 85 ft (26 m) long with a longest span of 45 ft (13.7 m) and a deck 43 ft wide.

Who owns Il 4 over S1 Trib L Silver Crk?

It is owned by the State Highway Agency.