US Bridges

I-255 over NSRR

Poor

St. Clair County, Illinois · 0.5 MI S of Il 15 · Structure no. 082022900000000

Built
1980
45 years old
Condition
Poor
inspected January 2025
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
157 ft
3 main spans
Daily traffic
41,500
2023 count
Owner
State
State Highway Agency

About this bridge

I-255 over NSRR is a steel continuous stringer/multi-beam or girder carrying I-255 over NSRR in St. Clair County, Illinois. It was built in 1980, so it is 45 years old, younger than the Illinois average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 2 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: open, would be posted or closed except for temporary shoring.

It carries about 41,500 vehicles a day, roughly 16% of them trucks, projected to reach 45,450 by 2046. The structure is 157 ft (47.9 m) long and 131 ft wide. If it were closed, the detour would be 36 mi (58 km).

Location

Open in Google Maps
CarriesI-255
CrossesNSRR
Location0.5 MI S of Il 15
RouteInterstate 255
CountySt. Clair County
StateIllinois
Coordinates38.57879, -90.11269
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure2 CriticalAdvanced deterioration of primary structural elements. Bridge may be closed until corrective action is taken.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJanuary 2025
Inspection intervalevery 12 months
Operating statusOpen, would be posted or closed except for temporary shoring
ScourBridge not over waterway
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36.8 US tons
Inventory rating22.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length157 ft (47.9 m)
Longest span59 ft (18.1 m)
Deck width131 ft (39.8 m)
Roadway width127 ft (38.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic41,500 (2023)
Projected traffic45,450 by 2046
Trucks16%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed36 mi (58 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-255 over NSRR built?

It was built in 1980, making it 45 years old in 2025.

What condition is I-255 over NSRR in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in January 2025.

How much traffic does I-255 over NSRR carry?

About 41,500 vehicles per day (2023 count), of which roughly 16% are trucks.

How long is I-255 over NSRR?

The structure is 157 ft (47.9 m) long with a longest span of 59 ft (18.1 m) and a deck 131 ft wide.

Who owns I-255 over NSRR?

It is owned by the State Highway Agency.