US Bridges

Is 270 E over Rt Ac

Good

St. Louis County, Missouri · S 31 T 47 N R 7 E · Structure no. 36727

Built
2022
3 years old
Condition
Good
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
165 ft
1 main span
Daily traffic
59,106
2024 count
Owner
State
State Highway Agency

About this bridge

Is 270 E over Rt Ac is a steel stringer/multi-beam or girder carrying Is 270 E over Rt Ac 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 59,106 vehicles a day, roughly 18% of them trucks, projected to reach 73,883 by 2044. The structure is 165 ft (50.3 m) long and 68 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesIs 270 E
CrossesRt Ac
LocationS 31 T 47 N R 7 E
RouteInterstate 270
Coordinates38.7709, -90.26694
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.
Superstructure9 ExcellentNo problems noted.
Substructure9 ExcellentNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation9: Superior to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating96.2 US tons
Inventory rating57.5 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length165 ft (50.3 m)
Longest span159 ft (48.6 m)
Deck width68 ft (20.6 m)
Roadway width65 ft (19.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic59,106 (2024)
Projected traffic73,883 by 2044
Trucks18%
Lanes on structure4
Traffic directionOne-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 Ac built?

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

What condition is Is 270 E over Rt Ac 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 Ac carry?

About 59,106 vehicles per day (2024 count), of which roughly 18% are trucks.

How long is Is 270 E over Rt Ac?

The structure is 165 ft (50.3 m) long with a longest span of 159 ft (48.6 m) and a deck 68 ft wide.

Who owns Is 270 E over Rt Ac?

It is owned by the State Highway Agency.