US Bridges

Is 270 W over BNSF RR

Fair

St. Louis County, Missouri · S 34 T 47 N R 7 E · Structure no. 6483

Built
1958
67 years old, rebuilt 1996
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
154 ft
3 main spans
Daily traffic
29,114
2024 count
Owner
State
State Highway Agency

About this bridge

Is 270 W over BNSF RR is a steel continuous stringer/multi-beam or girder carrying Is 270 W over BNSF RR in St. Louis County, Missouri. It was built in 1958 and reconstructed in 1996, so it is 67 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 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 29,114 vehicles a day, roughly 18% of them trucks, projected to reach 36,393 by 2044. The structure is 154 ft (46.9 m) long and 65 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesIs 270 W
CrossesBNSF RR
LocationS 34 T 47 N R 7 E
RouteInterstate 270
CountySt. Louis County
StateMissouri
Coordinates38.76793, -90.20871
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than 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 rating71.4 US tons
Inventory rating42.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length154 ft (46.9 m)
Longest span58 ft (17.7 m)
Deck width65 ft (19.9 m)
Roadway width63 ft (19.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic29,114 (2024)
Projected traffic36,393 by 2044
Trucks18%
Lanes on structure4
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 270 W over BNSF RR built?

It was built in 1958, making it 67 years old in 2025. It was reconstructed in 1996.

What condition is Is 270 W 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 August 2024.

How much traffic does Is 270 W over BNSF RR carry?

About 29,114 vehicles per day (2024 count), of which roughly 18% are trucks.

How long is Is 270 W over BNSF RR?

The structure is 154 ft (46.9 m) long with a longest span of 58 ft (17.7 m) and a deck 65 ft wide.

Who owns Is 270 W over BNSF RR?

It is owned by the State Highway Agency.