US Bridges

Rp IS55N to IS44W over Is 55

Fair

St. Louis city, Missouri · S 27 T 45 N R 7 E · Structure no. 892

Built
1965
60 years old, rebuilt 1985
Condition
Fair
inspected August 2023
Type
Box Beam or Girders - Single or Spread
Concrete Continuous
Length
200 ft
3 main spans
Daily traffic
17,530
2024 count
Owner
State
State Highway Agency

About this bridge

Rp IS55N to IS44W over Is 55 is a concrete continuous box beam or girders - single or spread carrying Rp IS55N to IS44W over Is 55 in St. Louis city, Missouri. It was built in 1965 and reconstructed in 1985, 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.

It carries about 17,530 vehicles a day, roughly 18% of them trucks, projected to reach 21,913 by 2044. The structure is 200 ft (61 m) long and 42 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesRp IS55N to IS44W
CrossesIs 55
LocationS 27 T 45 N R 7 E
RouteState Highway 0
CountySt. Louis city
StateMissouri
Coordinates38.6103, -90.21033
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 inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating70.4 US tons
Inventory rating42.7 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length200 ft (61 m)
Longest span82 ft (25.1 m)
Deck width42 ft (12.7 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deck16 ft (4.9 m)

Traffic and service

Average daily traffic17,530 (2024)
Projected traffic21,913 by 2044
Trucks18%
Lanes on structure3
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$1.9 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Rp IS55N to IS44W over Is 55 built?

It was built in 1965, making it 60 years old in 2025. It was reconstructed in 1985.

What condition is Rp IS55N to IS44W over Is 55 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 August 2023.

How much traffic does Rp IS55N to IS44W over Is 55 carry?

About 17,530 vehicles per day (2024 count), of which roughly 18% are trucks.

How long is Rp IS55N to IS44W over Is 55?

The structure is 200 ft (61 m) long with a longest span of 82 ft (25.1 m) and a deck 42 ft wide.

Who owns Rp IS55N to IS44W over Is 55?

It is owned by the State Highway Agency.