US Bridges

Is 55 N over Cst 2nd ST

Good

St. Louis city, Missouri · S 23 T 45 N R 7 E · Structure no. 35368

Built
2016
9 years old
Condition
Good
inspected September 2024
Type
Tee Beam
Prestressed Concrete Continuous
Length
312 ft
3 main spans
Daily traffic
22,463
2024 count
Owner
State
State Highway Agency

About this bridge

Is 55 N over Cst 2nd ST is a prestressed concrete continuous tee beam carrying Is 55 N over Cst 2nd ST in St. Louis city, Missouri. It was built in 2016, so it is 9 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 22,463 vehicles a day, roughly 12% of them trucks, projected to reach 28,079 by 2044. The structure is 312 ft (95.1 m) long and 39 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesIs 55 N
CrossesCst 2nd ST
LocationS 23 T 45 N R 7 E
RouteInterstate 55
Coordinates38.6193, -90.1896
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
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure9 ExcellentNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating73.4 US tons
Inventory rating43.7 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3 (+1 approach)
Design loadHL 93
Structure length312 ft (95.1 m)
Longest span88 ft (26.8 m)
Deck width39 ft (11.8 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic22,463 (2024)
Projected traffic28,079 by 2044
Trucks12%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed5 mi (8 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 55 N over Cst 2nd ST built?

It was built in 2016, making it 9 years old in 2025.

What condition is Is 55 N over Cst 2nd ST 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 September 2024.

How much traffic does Is 55 N over Cst 2nd ST carry?

About 22,463 vehicles per day (2024 count), of which roughly 12% are trucks.

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

The structure is 312 ft (95.1 m) long with a longest span of 88 ft (26.8 m) and a deck 39 ft wide.

Who owns Is 55 N over Cst 2nd ST?

It is owned by the State Highway Agency.