US Bridges

Is 70 E over Cst Prairie Ave

Fair

St. Louis city, Missouri · S 14 T 46 N R 2 E · Structure no. 12012

Built
1998
27 years old
Condition
Fair
inspected July 2023
Type
Slab
Concrete Continuous
Length
141 ft
3 main spans
Daily traffic
90,791
2024 count
Owner
State
State Highway Agency

About this bridge

Is 70 E over Cst Prairie Ave is a concrete continuous slab carrying Is 70 E over Cst Prairie Ave in St. Louis city, Missouri. It was built in 1998, so it is 27 years old, younger 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 90,791 vehicles a day, roughly 18% of them trucks, projected to reach 113,489 by 2044. The structure is 141 ft (43 m) long and 177 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesIs 70 E
CrossesCst Prairie Ave
LocationS 14 T 46 N R 2 E
RouteInterstate 70
CountySt. Louis city
StateMissouri
Coordinates38.67582, -90.20625
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.
Substructure7 GoodSome minor problems.
Last inspectionJuly 2023
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 rating80.4 US tons
Inventory rating48.6 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length141 ft (43 m)
Longest span62 ft (18.9 m)
Deck width177 ft (54.1 m)
Roadway width171 ft (52 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic90,791 (2024)
Projected traffic113,489 by 2044
Trucks18%
Lanes on structure10
Traffic directionTwo-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 E over Cst Prairie Ave built?

It was built in 1998, making it 27 years old in 2025.

What condition is Is 70 E over Cst Prairie Ave 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 July 2023.

How much traffic does Is 70 E over Cst Prairie Ave carry?

About 90,791 vehicles per day (2024 count), of which roughly 18% are trucks.

How long is Is 70 E over Cst Prairie Ave?

The structure is 141 ft (43 m) long with a longest span of 62 ft (18.9 m) and a deck 177 ft wide.

Who owns Is 70 E over Cst Prairie Ave?

It is owned by the State Highway Agency.