US Bridges

N Siu Ent RD SB over NSRR

Poor

Madison County, Illinois · 1MI S of Il 143 · Structure no. 060014300000000

Built
1968
57 years old
Condition
Poor
inspected May 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
154 ft
3 main spans
Daily traffic
2,775
2021 count
Owner
State
State Highway Agency

About this bridge

N Siu Ent RD SB over NSRR is a prestressed concrete stringer/multi-beam or girder carrying N Siu Ent RD SB over NSRR in Madison County, Illinois. It was built in 1968, so it is 57 years old, older 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 4 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.

It carries about 2,775 vehicles a day, roughly 6% of them trucks, projected to reach 2,969 by 2046. The structure is 154 ft (46.9 m) long and 36 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesN Siu Ent RD SB
CrossesNSRR
Location1MI S of Il 143
CountyMadison County
StateIllinois
Coordinates38.81883, -89.99409
Functional classUrban Minor Arterial

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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating87.5 US tons
Inventory rating51.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length154 ft (46.9 m)
Longest span58 ft (17.7 m)
Deck width36 ft (11 m)
Roadway width32 ft (9.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,775 (2021)
Projected traffic2,969 by 2046
Trucks6%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
Detour if closed1.2 mi (2 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was N Siu Ent RD SB over NSRR built?

It was built in 1968, making it 57 years old in 2025.

What condition is N Siu Ent RD SB 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 May 2024.

How much traffic does N Siu Ent RD SB over NSRR carry?

About 2,775 vehicles per day (2021 count), of which roughly 6% are trucks.

How long is N Siu Ent RD SB over NSRR?

The structure is 154 ft (46.9 m) long with a longest span of 58 ft (17.7 m) and a deck 36 ft wide.

Who owns N Siu Ent RD SB over NSRR?

It is owned by the State Highway Agency.