US Bridges

Il 161 over NSRR

Fair

St. Clair County, Illinois · 0.6 MI E of Il 159 · Structure no. 082027700000000

Built
1990
35 years old
Condition
Fair
inspected April 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
57 ft
1 main span
Daily traffic
19,600
2023 count
Owner
State
State Highway Agency

About this bridge

Il 161 over NSRR is a prestressed concrete box beam or girders - multiple carrying Il 161 over NSRR in St. Clair County, Illinois. It was built in 1990, so it is 35 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 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 19,600 vehicles a day, roughly 2% of them trucks, projected to reach 20,705 by 2046. The structure is 57 ft (17.4 m) long and 74 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesIl 161
CrossesNSRR
Location0.6 MI E of Il 159
RouteState Highway 161
CountySt. Clair County
StateIllinois
Coordinates38.53286, -89.97317
Functional classUrban Other Principal 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionApril 2023
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 rating60.4 US tons
Inventory rating36 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length57 ft (17.4 m)
Longest span54 ft (16.4 m)
Deck width74 ft (22.6 m)
Roadway width66 ft (20.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic19,600 (2023)
Projected traffic20,705 by 2046
Trucks2%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed9.9 mi (16 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Il 161 over NSRR built?

It was built in 1990, making it 35 years old in 2025.

What condition is Il 161 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 April 2023.

How much traffic does Il 161 over NSRR carry?

About 19,600 vehicles per day (2023 count), of which roughly 2% are trucks.

How long is Il 161 over NSRR?

The structure is 57 ft (17.4 m) long with a longest span of 54 ft (16.4 m) and a deck 74 ft wide.

Who owns Il 161 over NSRR?

It is owned by the State Highway Agency.