US Bridges

West Florissant Av over Is 270

Fair

St. Louis County, Missouri · S 31 T 47 N R 7 E · Structure no. 36424

Built
2020
5 years old
Condition
Fair
inspected August 2024
Type
Tee Beam
Prestressed Concrete
Length
183 ft
2 main spans
Daily traffic
18,087
2024 count
Owner
State
State Highway Agency

About this bridge

West Florissant Av over Is 270 is a prestressed concrete tee beam carrying West Florissant Av over Is 270 in St. Louis County, Missouri. It was built in 2020, so it is 5 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 18,087 vehicles a day, roughly 5% of them trucks, projected to reach 25,322 by 2044. The structure is 183 ft (55.9 m) long and 142 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesWest Florissant Av
CrossesIs 270
LocationS 31 T 47 N R 7 E
RouteCity Street 0
CountySt. Louis County
StateMissouri
Coordinates38.77124, -90.27994
Functional classUrban Other Principal 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Last inspectionAugust 2024
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 alignment8: Equal to present desirable criteria
Operating rating73.4 US tons
Inventory rating27.8 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHL 93
Structure length183 ft (55.9 m)
Longest span101 ft (30.7 m)
Deck width142 ft (43.2 m)
Roadway width94 ft (28.7 m)
Vertical clearance over deck17 ft (5 m)

Traffic and service

Average daily traffic18,087 (2024)
Projected traffic25,322 by 2044
Trucks5%
Lanes on structure9
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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 West Florissant Av over Is 270 built?

It was built in 2020, making it 5 years old in 2025.

What condition is West Florissant Av over Is 270 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 2024.

How much traffic does West Florissant Av over Is 270 carry?

About 18,087 vehicles per day (2024 count), of which roughly 5% are trucks.

How long is West Florissant Av over Is 270?

The structure is 183 ft (55.9 m) long with a longest span of 101 ft (30.7 m) and a deck 142 ft wide.

Who owns West Florissant Av over Is 270?

It is owned by the State Highway Agency.