US Bridges

Clayton RD E over Is 270

Fair

St. Louis County, Missouri · S 22 T 45 N R 5 E · Structure no. 3590

Built
1985
40 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
324 ft
2 main spans
Daily traffic
8,536
2024 count
Owner
State
State Highway Agency

About this bridge

Clayton RD E over Is 270 is a steel continuous stringer/multi-beam or girder carrying Clayton RD E over Is 270 in St. Louis County, Missouri. It was built in 1985, so it is 40 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 5 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 8,536 vehicles a day, roughly 4% of them trucks, projected to reach 11,950 by 2044. The structure is 324 ft (98.8 m) long and 57 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesClayton RD E
CrossesIs 270
LocationS 22 T 45 N R 5 E
RouteCity Street 0
CountySt. Louis County
StateMissouri
Coordinates38.62743, -90.45082
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
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 inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.5 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length324 ft (98.8 m)
Longest span166 ft (50.5 m)
Deck width57 ft (17.5 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,536 (2024)
Projected traffic11,950 by 2044
Trucks4%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 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 Clayton RD E over Is 270 built?

It was built in 1985, making it 40 years old in 2025.

What condition is Clayton RD E 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 June 2024.

How much traffic does Clayton RD E over Is 270 carry?

About 8,536 vehicles per day (2024 count), of which roughly 4% are trucks.

How long is Clayton RD E over Is 270?

The structure is 324 ft (98.8 m) long with a longest span of 166 ft (50.5 m) and a deck 57 ft wide.

Who owns Clayton RD E over Is 270?

It is owned by the State Highway Agency.