US Bridges

Is 70 W over Rp IS70E to IS270E

Fair

St. Louis County, Missouri · S 729 T 46 N R 5 E · Structure no. 3121

Built
1978
47 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
361 ft
5 main spans
Daily traffic
85,412
2024 count
Owner
State
State Highway Agency

About this bridge

Is 70 W over Rp IS70E to IS270E is a prestressed concrete continuous stringer/multi-beam or girder carrying Is 70 W over Rp IS70E to IS270E in St. Louis County, Missouri. It was built in 1978, so it is 47 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 85,412 vehicles a day, roughly 12% of them trucks, projected to reach 106,765 by 2044. The structure is 361 ft (110 m) long and 57 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesIs 70 W
CrossesRp IS70E to IS270E
LocationS 729 T 46 N R 5 E
RouteInterstate 70
CountySt. Louis County
StateMissouri
Coordinates38.74916, -90.44099
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 inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75.4 US tons
Inventory rating34.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20 + Mod
Structure length361 ft (110 m)
Longest span85 ft (25.9 m)
Deck width57 ft (17.5 m)
Roadway width56 ft (17 m)
Vertical clearance over deck18 ft (5.5 m)

Traffic and service

Average daily traffic85,412 (2024)
Projected traffic106,765 by 2044
Trucks12%
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 70 W over Rp IS70E to IS270E built?

It was built in 1978, making it 47 years old in 2025.

What condition is Is 70 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 September 2024.

How much traffic does Is 70 W over Rp IS70E to IS270E carry?

About 85,412 vehicles per day (2024 count), of which roughly 12% are trucks.

How long is Is 70 W over Rp IS70E to IS270E?

The structure is 361 ft (110 m) long with a longest span of 85 ft (25.9 m) and a deck 57 ft wide.

Who owns Is 70 W over Rp IS70E to IS270E?

It is owned by the State Highway Agency.