US Bridges

Chain of Rocks Roa over Over Il 255 (FAP310)

Fair

Madison County, Illinois · 2 M West of Il 157 · Structure no. 060024500000000

Built
1994
31 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
479 ft
4 main spans
Daily traffic
2,200
2021 count
Owner
State
State Highway Agency

About this bridge

Chain of Rocks Roa over Over Il 255 (FAP310) is a steel continuous stringer/multi-beam or girder carrying Chain of Rocks Roa over Over Il 255 (FAP310) in Madison County, Illinois. It was built in 1994, so it is 31 years old, younger 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 2,200 vehicles a day, roughly 10% of them trucks, projected to reach 2,354 by 2046. The structure is 479 ft (145.9 m) long and 47 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesChain of Rocks Roa
CrossesOver Il 255 (FAP310)
Location2 M West of Il 157
CountyMadison County
StateIllinois
Coordinates38.762, -90.04376
Functional classUrban Minor 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating78.6 US tons
Inventory rating46.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4 (+2 approach)
Design loadHS 20 + Mod
Structure length479 ft (145.9 m)
Longest span148 ft (45.1 m)
Deck width47 ft (14.4 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,200 (2021)
Projected traffic2,354 by 2046
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

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 Chain of Rocks Roa over Over Il 255 (FAP310) built?

It was built in 1994, making it 31 years old in 2025.

What condition is Chain of Rocks Roa over Over Il 255 (FAP310) 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 November 2024.

How much traffic does Chain of Rocks Roa over Over Il 255 (FAP310) carry?

About 2,200 vehicles per day (2021 count), of which roughly 10% are trucks.

How long is Chain of Rocks Roa over Over Il 255 (FAP310)?

The structure is 479 ft (145.9 m) long with a longest span of 148 ft (45.1 m) and a deck 47 ft wide.

Who owns Chain of Rocks Roa over Over Il 255 (FAP310)?

It is owned by the State Highway Agency.