US Bridges

Rp IS55S to IS255S over Is 55 Is 255

Fair

St. Louis County, Missouri · S 34 T 44 N R 6 E · Structure no. 3975

Built
1991
34 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
1,346 ft
16 main spans
Daily traffic
13,102
2024 count
Owner
State
State Highway Agency

About this bridge

Rp IS55S to IS255S over Is 55 Is 255 is a steel continuous stringer/multi-beam or girder carrying Rp IS55S to IS255S over Is 55 Is 255 in St. Louis County, Missouri. It was built in 1991, so it is 34 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 13,102 vehicles a day, roughly 19% of them trucks, projected to reach 16,378 by 2044. The structure is 1,346 ft (410.3 m) long and 41 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

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CarriesRp IS55S to IS255S
CrossesIs 55 Is 255
LocationS 34 T 44 N R 6 E
RouteState Highway 0
CountySt. Louis County
StateMissouri
Coordinates38.50332, -90.33902
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 inspectionMarch 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 rating93.3 US tons
Inventory rating56.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans16
Design loadHS 20 + Mod
Structure length1,346 ft (410.3 m)
Longest span90 ft (27.5 m)
Deck width41 ft (12.6 m)
Roadway width39 ft (11.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,102 (2024)
Projected traffic16,378 by 2044
Trucks19%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed9.9 mi (16 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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Rp IS55S to IS255S over Is 55 Is 255 built?

It was built in 1991, making it 34 years old in 2025.

What condition is Rp IS55S to IS255S over Is 55 Is 255 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 March 2023.

How much traffic does Rp IS55S to IS255S over Is 55 Is 255 carry?

About 13,102 vehicles per day (2024 count), of which roughly 19% are trucks.

How long is Rp IS55S to IS255S over Is 55 Is 255?

The structure is 1,346 ft (410.3 m) long with a longest span of 90 ft (27.5 m) and a deck 41 ft wide.

Who owns Rp IS55S to IS255S over Is 55 Is 255?

It is owned by the State Highway Agency.