US Bridges

US 50 over Silver Creek

Good

St. Clair County, Illinois · 1.5 M W Ill 4 · Structure no. 082003600000000

Built
1939
86 years old, rebuilt 1983
Condition
Good
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
184 ft
3 main spans
Daily traffic
16,000
2023 count
Owner
State
State Highway Agency

About this bridge

US 50 over Silver Creek is a steel continuous stringer/multi-beam or girder carrying US 50 over Silver Creek in St. Clair County, Illinois. It was built in 1939 and reconstructed in 1983, so it is 86 years old, older 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 16,000 vehicles a day, roughly 8% of them trucks, projected to reach 14,241 by 2046. The structure is 184 ft (56.1 m) long and 36 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesUS 50
CrossesSilver Creek
Location1.5 M W Ill 4
RouteU.S. Route 50
CountySt. Clair County
StateIllinois
Coordinates38.59411, -89.8353
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 inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating67.1 US tons
Inventory rating33.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length184 ft (56.1 m)
Longest span71 ft (21.6 m)
Deck width36 ft (10.9 m)
Roadway width33 ft (10 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16,000 (2023)
Projected traffic14,241 by 2046
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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 US 50 over Silver Creek built?

It was built in 1939, making it 86 years old in 2025. It was reconstructed in 1983.

What condition is US 50 over Silver Creek 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 July 2023.

How much traffic does US 50 over Silver Creek carry?

About 16,000 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is US 50 over Silver Creek?

The structure is 184 ft (56.1 m) long with a longest span of 71 ft (21.6 m) and a deck 36 ft wide.

Who owns US 50 over Silver Creek?

It is owned by the State Highway Agency.