US Bridges

US 34 over Bn RR

Fair

Bureau County, Illinois · 1.1MI NE JCT Ill 26 · Structure no. 006013500000000

Built
1971
54 years old
Condition
Fair
inspected December 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
349 ft
5 main spans
Daily traffic
1,500
2023 count
Owner
State
State Highway Agency

About this bridge

US 34 over Bn RR is a steel continuous stringer/multi-beam or girder carrying US 34 over Bn RR in Bureau County, Illinois. It was built in 1971, so it is 54 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 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 1,500 vehicles a day, roughly 5% of them trucks, projected to reach 1,313 by 2046. The structure is 349 ft (106.3 m) long and 46 ft wide. If it were closed, the detour would be 21.7 mi (35 km).

Location

Open in Google Maps
CarriesUS 34
CrossesBn RR
Location1.1MI NE JCT Ill 26
RouteU.S. Route 34
CountyBureau County
StateIllinois
Coordinates41.39427, -89.44227
Functional classUrban Collector

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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating65.4 US tons
Inventory rating39.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length349 ft (106.3 m)
Longest span89 ft (27.1 m)
Deck width46 ft (14 m)
Roadway width43 ft (13 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,500 (2023)
Projected traffic1,313 by 2046
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed21.7 mi (35 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 US 34 over Bn RR built?

It was built in 1971, making it 54 years old in 2025.

What condition is US 34 over Bn RR 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 December 2023.

How much traffic does US 34 over Bn RR carry?

About 1,500 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is US 34 over Bn RR?

The structure is 349 ft (106.3 m) long with a longest span of 89 ft (27.1 m) and a deck 46 ft wide.

Who owns US 34 over Bn RR?

It is owned by the State Highway Agency.