US Bridges

West Port Plaza DR over Rt D

FairPosted for load

St. Louis County, Missouri · S 1312 T 46 N R 5 E · Structure no. 2973

Built
1978
47 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
243 ft
4 main spans
Daily traffic
10,975
2024 count
Owner
State
State Highway Agency

About this bridge

West Port Plaza DR over Rt D is a steel continuous stringer/multi-beam or girder carrying West Port Plaza DR over Rt D in St. Louis County, Missouri. It was built in 1978, so it is 47 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 5 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 10,975 vehicles a day, roughly 3% of them trucks, projected to reach 15,365 by 2044. The structure is 243 ft (74.1 m) long and 81 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesWest Port Plaza DR
CrossesRt D
LocationS 1312 T 46 N R 5 E
RouteCity Street 0
CountySt. Louis County
StateMissouri
Coordinates38.69967, -90.44293
Functional classUrban Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating51.6 US tons
Inventory rating33.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length243 ft (74.1 m)
Longest span82 ft (25 m)
Deck width81 ft (24.6 m)
Roadway width67 ft (20.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,975 (2024)
Projected traffic15,365 by 2044
Trucks3%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

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 West Port Plaza DR over Rt D built?

It was built in 1978, making it 47 years old in 2025.

What condition is West Port Plaza DR over Rt D 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 September 2024.

How much traffic does West Port Plaza DR over Rt D carry?

About 10,975 vehicles per day (2024 count), of which roughly 3% are trucks.

How long is West Port Plaza DR over Rt D?

The structure is 243 ft (74.1 m) long with a longest span of 82 ft (25 m) and a deck 81 ft wide.

Who owns West Port Plaza DR over Rt D?

It is owned by the State Highway Agency.