US Bridges

Il 255 NB over Humbert RD (ch 4)

Good

Madison County, Illinois · 2.8MI W of Seminary · Structure no. 060030800000000

Built
2012
13 years old
Condition
Good
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
149 ft
1 main span
Daily traffic
9,850
2023 count
Owner
State
State Highway Agency

About this bridge

Il 255 NB over Humbert RD (ch 4) is a steel stringer/multi-beam or girder carrying Il 255 NB over Humbert RD (ch 4) in Madison County, Illinois. It was built in 2012, so it is 13 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 9,850 vehicles a day, roughly 13% of them trucks, projected to reach 3,424 by 2046. The structure is 149 ft (45.5 m) long and 45 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesIl 255 NB
CrossesHumbert RD (ch 4)
Location2.8MI W of Seminary
RouteState Highway 255
CountyMadison County
StateIllinois
Coordinates38.96395, -90.18087
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75.7 US tons
Inventory rating45.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadHS 20
Structure length149 ft (45.5 m)
Longest span148 ft (45 m)
Deck width45 ft (13.8 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,850 (2023)
Projected traffic3,424 by 2046
Trucks13%
Lanes on structure2
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 Il 255 NB over Humbert RD (ch 4) built?

It was built in 2012, making it 13 years old in 2025.

What condition is Il 255 NB over Humbert RD (ch 4) 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 November 2024.

How much traffic does Il 255 NB over Humbert RD (ch 4) carry?

About 9,850 vehicles per day (2023 count), of which roughly 13% are trucks.

How long is Il 255 NB over Humbert RD (ch 4)?

The structure is 149 ft (45.5 m) long with a longest span of 148 ft (45 m) and a deck 45 ft wide.

Who owns Il 255 NB over Humbert RD (ch 4)?

It is owned by the State Highway Agency.