US Bridges

Is 55 S over BNSF RR

Fair

Jefferson County, Missouri · S 420 T 41 N R 6 E · Structure no. 833

Built
1965
60 years old, rebuilt 2001
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
278 ft
3 main spans
Daily traffic
43,542
2024 count
Owner
State
State Highway Agency

About this bridge

Is 55 S over BNSF RR is a steel continuous stringer/multi-beam or girder carrying Is 55 S over BNSF RR in Jefferson County, Missouri. It was built in 1965 and reconstructed in 2001, so it is 60 years old, older than the Missouri average of 45.1 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 43,542 vehicles a day, roughly 15% of them trucks, projected to reach 80,553 by 2044. The structure is 278 ft (84.7 m) long and 44 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesIs 55 S
CrossesBNSF RR
LocationS 420 T 41 N R 6 E
RouteInterstate 55
CountyJefferson County
StateMissouri
Coordinates38.29164, -90.40435
Functional classUrban Principal Arterial - Interstate

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionNovember 2024
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 geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating74.4 US tons
Inventory rating44.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length278 ft (84.7 m)
Longest span104 ft (31.7 m)
Deck width44 ft (13.3 m)
Roadway width41 ft (12.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic43,542 (2024)
Projected traffic80,553 by 2044
Trucks15%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
Detour if closed0.6 mi (1 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 Is 55 S over BNSF RR built?

It was built in 1965, making it 60 years old in 2025. It was reconstructed in 2001.

What condition is Is 55 S over BNSF 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 November 2024.

How much traffic does Is 55 S over BNSF RR carry?

About 43,542 vehicles per day (2024 count), of which roughly 15% are trucks.

How long is Is 55 S over BNSF RR?

The structure is 278 ft (84.7 m) long with a longest span of 104 ft (31.7 m) and a deck 44 ft wide.

Who owns Is 55 S over BNSF RR?

It is owned by the State Highway Agency.