US Bridges

Is 270 E over Mo 180

Fair

St. Louis County, Missouri · S 131 T 47 N R 5 E · Structure no. 758

Built
1960
65 years old, rebuilt 1996
Condition
Fair
inspected August 2024
Type
Box Beam or Girders - Single or Spread
Concrete Continuous
Length
185 ft
3 main spans
Daily traffic
70,299
2024 count
Owner
State
State Highway Agency

About this bridge

Is 270 E over Mo 180 is a concrete continuous box beam or girders - single or spread carrying Is 270 E over Mo 180 in St. Louis County, Missouri. It was built in 1960 and reconstructed in 1996, so it is 65 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 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 70,299 vehicles a day, roughly 18% of them trucks, projected to reach 87,874 by 2044. The structure is 185 ft (56.4 m) long and 47 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesIs 270 E
CrossesMo 180
LocationS 131 T 47 N R 5 E
RouteInterstate 270
CountySt. Louis County
StateMissouri
Coordinates38.75769, -90.43334
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
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 rating67.5 US tons
Inventory rating40.7 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length185 ft (56.4 m)
Longest span87 ft (26.5 m)
Deck width47 ft (14.3 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic70,299 (2024)
Projected traffic87,874 by 2044
Trucks18%
Lanes on structure5
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$2.6 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Is 270 E over Mo 180 built?

It was built in 1960, making it 65 years old in 2025. It was reconstructed in 1996.

What condition is Is 270 E over Mo 180 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 Is 270 E over Mo 180 carry?

About 70,299 vehicles per day (2024 count), of which roughly 18% are trucks.

How long is Is 270 E over Mo 180?

The structure is 185 ft (56.4 m) long with a longest span of 87 ft (26.5 m) and a deck 47 ft wide.

Who owns Is 270 E over Mo 180?

It is owned by the State Highway Agency.