US Bridges

Mo 364 E over Is 270

FairPosted for load

St. Louis County, Missouri · S 1312 T 46 N R 5 E · Structure no. 1025

Built
1966
59 years old, rebuilt 2001
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
256 ft
4 main spans
Daily traffic
24,866
2024 count
Owner
State
State Highway Agency

About this bridge

Mo 364 E over Is 270 is a steel continuous stringer/multi-beam or girder carrying Mo 364 E over Is 270 in St. Louis County, Missouri. It was built in 1966 and reconstructed in 2001, so it is 59 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 24,866 vehicles a day, roughly 5% of them trucks, projected to reach 31,083 by 2044. The structure is 256 ft (78 m) long and 68 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesMo 364 E
CrossesIs 270
LocationS 1312 T 46 N R 5 E
RouteState Highway 364
CountySt. Louis County
StateMissouri
Coordinates38.6982, -90.45065
Functional classUrban Principal Arterial - Other Freeway or Expressway

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 geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75.4 US tons
Inventory rating45.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length256 ft (78 m)
Longest span76 ft (23.2 m)
Deck width68 ft (20.8 m)
Roadway width66 ft (20 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic24,866 (2024)
Projected traffic31,083 by 2044
Trucks5%
Lanes on structure5
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed0.6 mi (1 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 Mo 364 E over Is 270 built?

It was built in 1966, making it 59 years old in 2025. It was reconstructed in 2001.

What condition is Mo 364 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 September 2024.

How much traffic does Mo 364 E over Is 270 carry?

About 24,866 vehicles per day (2024 count), of which roughly 5% are trucks.

How long is Mo 364 E over Is 270?

The structure is 256 ft (78 m) long with a longest span of 76 ft (23.2 m) and a deck 68 ft wide.

Who owns Mo 364 E over Is 270?

It is owned by the State Highway Agency.