US Bridges

Is 270 W over Rp IS70E to IS270E

Fair

St. Louis County, Missouri · S 729 T 46 N R 5 E · Structure no. 3116

Built
1979
46 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
306 ft
5 main spans
Daily traffic
74,863
2024 count
Owner
State
State Highway Agency

About this bridge

Is 270 W over Rp IS70E to IS270E is a prestressed concrete continuous stringer/multi-beam or girder carrying Is 270 W over Rp IS70E to IS270E in St. Louis County, Missouri. It was built in 1979, so it is 46 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 74,863 vehicles a day, roughly 18% of them trucks, projected to reach 93,579 by 2044. The structure is 306 ft (93.3 m) long and 66 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesIs 270 W
CrossesRp IS70E to IS270E
LocationS 729 T 46 N R 5 E
RouteInterstate 270
CountySt. Louis County
StateMissouri
Coordinates38.74992, -90.43937
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating91.3 US tons
Inventory rating46.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20 + Mod
Structure length306 ft (93.3 m)
Longest span84 ft (25.6 m)
Deck width66 ft (20 m)
Roadway width63 ft (19.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic74,863 (2024)
Projected traffic93,579 by 2044
Trucks18%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
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 Rp IS70E to IS270E built?

It was built in 1979, making it 46 years old in 2025.

What condition is Is 270 W over Rp IS70E to IS270E 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 Rp IS70E to IS270E carry?

About 74,863 vehicles per day (2024 count), of which roughly 18% are trucks.

How long is Is 270 W over Rp IS70E to IS270E?

The structure is 306 ft (93.3 m) long with a longest span of 84 ft (25.6 m) and a deck 66 ft wide.

Who owns Is 270 W over Rp IS70E to IS270E?

It is owned by the State Highway Agency.