US Bridges

Is 55 N over Cst 2nd ST

FairPosted for load

St. Louis city, Missouri · S 34 T 45 N R 7 E · Structure no. 883

Built
1965
60 years old, rebuilt 2022
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
597 ft
8 main spans
Daily traffic
50,725
2024 count
Owner
State
State Highway Agency

About this bridge

Is 55 N over Cst 2nd ST is a steel continuous stringer/multi-beam or girder carrying Is 55 N over Cst 2nd ST in St. Louis city, Missouri. It was built in 1965 and reconstructed in 2022, so it is 60 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. Its operating status is: posted for load restriction.

It carries about 50,725 vehicles a day, roughly 12% of them trucks, projected to reach 63,406 by 2044. The structure is 597 ft (182 m) long and 67 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesIs 55 N
CrossesCst 2nd ST
LocationS 34 T 45 N R 7 E
RouteInterstate 55
Coordinates38.59028, -90.21389
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
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating47.6 US tons
Inventory rating28.8 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans8
Design loadHS 20 + Mod
Structure length597 ft (182 m)
Longest span81 ft (24.8 m)
Deck width67 ft (20.3 m)
Roadway width64 ft (19.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50,725 (2024)
Projected traffic63,406 by 2044
Trucks12%
Lanes on structure4
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 55 N over Cst 2nd ST built?

It was built in 1965, making it 60 years old in 2025. It was reconstructed in 2022.

What condition is Is 55 N over Cst 2nd ST 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 55 N over Cst 2nd ST carry?

About 50,725 vehicles per day (2024 count), of which roughly 12% are trucks.

How long is Is 55 N over Cst 2nd ST?

The structure is 597 ft (182 m) long with a longest span of 81 ft (24.8 m) and a deck 67 ft wide.

Who owns Is 55 N over Cst 2nd ST?

It is owned by the State Highway Agency.