US Bridges

Is 270 E over Rt N

Good

St. Louis County, Missouri · S 35 T 47 N R 6 E · Structure no. 36725

Built
2022
3 years old
Condition
Good
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
152 ft
1 main span
Daily traffic
111,443
2024 count
Owner
State
State Highway Agency

About this bridge

Is 270 E over Rt N is a steel stringer/multi-beam or girder carrying Is 270 E over Rt N in St. Louis County, Missouri. It was built in 2022, so it is 3 years old, younger than the Missouri average of 45.1 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 111,443 vehicles a day, roughly 18% of them trucks, projected to reach 139,304 by 2044. The structure is 152 ft (46.2 m) long and 159 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesIs 270 E
CrossesRt N
LocationS 35 T 47 N R 6 E
RouteInterstate 270
Coordinates38.77371, -90.31717
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure9 ExcellentNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating93.3 US tons
Inventory rating55.6 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length152 ft (46.2 m)
Longest span146 ft (44.6 m)
Deck width159 ft (48.4 m)
Roadway width154 ft (46.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic111,443 (2024)
Projected traffic139,304 by 2044
Trucks18%
Lanes on structure10
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 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 statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Is 270 E over Rt N built?

It was built in 2022, making it 3 years old in 2025.

What condition is Is 270 E over Rt N in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in August 2024.

How much traffic does Is 270 E over Rt N carry?

About 111,443 vehicles per day (2024 count), of which roughly 18% are trucks.

How long is Is 270 E over Rt N?

The structure is 152 ft (46.2 m) long with a longest span of 146 ft (44.6 m) and a deck 159 ft wide.

Who owns Is 270 E over Rt N?

It is owned by the State Highway Agency.