US Bridges

Is 55 S over Is 44 Rp IS44E to Mem

Good

St. Louis city, Missouri · S 23 T 45 N R 7 E · Structure no. 34664

Built
2015
10 years old
Condition
Good
inspected September 2024
Type
Tee Beam
Prestressed Concrete Continuous
Length
895 ft
4 main spans
Daily traffic
32,335
2024 count
Owner
State
State Highway Agency

About this bridge

Is 55 S over Is 44 Rp IS44E to Mem is a prestressed concrete continuous tee beam carrying Is 55 S over Is 44 Rp IS44E to Mem in St. Louis city, Missouri. It was built in 2015, so it is 10 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 32,335 vehicles a day, roughly 18% of them trucks, projected to reach 40,419 by 2044. The structure is 895 ft (272.8 m) long and 39 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesIs 55 S
CrossesIs 44 Rp IS44E to Mem
LocationS 23 T 45 N R 7 E
RouteInterstate 55
CountySt. Louis city
StateMissouri
Coordinates38.61991, -90.18871
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo 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 rating61.5 US tons
Inventory rating46.6 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans4 (+6 approach)
Design loadHL 93
Structure length895 ft (272.8 m)
Longest span142 ft (43.3 m)
Deck width39 ft (11.8 m)
Roadway width36 ft (11 m)
Vertical clearance over deck17 ft (5.3 m)

Traffic and service

Average daily traffic32,335 (2024)
Projected traffic40,419 by 2044
Trucks18%
Lanes on structure2
Traffic directionOne-way traffic
CarriesThird level (interchange)
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 S over Is 44 Rp IS44E to Mem built?

It was built in 2015, making it 10 years old in 2025.

What condition is Is 55 S over Is 44 Rp IS44E to Mem 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 S over Is 44 Rp IS44E to Mem carry?

About 32,335 vehicles per day (2024 count), of which roughly 18% are trucks.

How long is Is 55 S over Is 44 Rp IS44E to Mem?

The structure is 895 ft (272.8 m) long with a longest span of 142 ft (43.3 m) and a deck 39 ft wide.

Who owns Is 55 S over Is 44 Rp IS44E to Mem?

It is owned by the State Highway Agency.