US Bridges

Ill 4 over NSRR

Fair

Macoupin County, Illinois · 2.0 M N Staunton · Structure no. 059000900000000

Built
1959
66 years old, rebuilt 1998
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
227 ft
3 main spans
Daily traffic
2,800
2023 count
Owner
State
State Highway Agency

About this bridge

Ill 4 over NSRR is a steel continuous stringer/multi-beam or girder carrying Ill 4 over NSRR in Macoupin County, Illinois. It was built in 1959 and reconstructed in 1998, so it is 66 years old, older 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 6 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 2,800 vehicles a day, roughly 7% of them trucks, projected to reach 2,828 by 2046. The structure is 227 ft (69.3 m) long and 39 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesIll 4
CrossesNSRR
Location2.0 M N Staunton
RouteState Highway 4
CountyMacoupin County
StateIllinois
Coordinates39.04629, -89.80646
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating98.2 US tons
Inventory rating54.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length227 ft (69.3 m)
Longest span86 ft (26.3 m)
Deck width39 ft (11.8 m)
Roadway width35 ft (10.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,800 (2023)
Projected traffic2,828 by 2046
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed3.7 mi (6 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 proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$765,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was Ill 4 over NSRR built?

It was built in 1959, making it 66 years old in 2025. It was reconstructed in 1998.

What condition is Ill 4 over NSRR 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 Ill 4 over NSRR carry?

About 2,800 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is Ill 4 over NSRR?

The structure is 227 ft (69.3 m) long with a longest span of 86 ft (26.3 m) and a deck 39 ft wide.

Who owns Ill 4 over NSRR?

It is owned by the State Highway Agency.