US Bridges

Is 270 E over Cowmire CR

Fair

St. Louis County, Missouri · S 131 T 46 N R 5 E · Structure no. 141

Built
1960
65 years old, rebuilt 1981
Condition
Fair
inspected November 2023
Type
Culvert
Concrete Continuous
Length
38 ft
3 main spans
Daily traffic
105,806
2024 count
Owner
State
State Highway Agency

About this bridge

Is 270 E over Cowmire CR is a concrete continuous culvert carrying Is 270 E over Cowmire CR in St. Louis County, Missouri. It was built in 1960 and reconstructed in 1981, 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 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 105,806 vehicles a day, roughly 18% of them trucks, projected to reach 132,258 by 2044. The structure is 38 ft (11.6 m) long. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesIs 270 E
CrossesCowmire CR
LocationS 131 T 46 N R 5 E
RouteInterstate 270
CountySt. Louis County
StateMissouri
Coordinates38.75892, -90.43056
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating79.4 US tons
Inventory rating47.6 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadHS 20
Structure length38 ft (11.6 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic105,806 (2024)
Projected traffic132,258 by 2044
Trucks18%
Lanes on structure9
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Is 270 E over Cowmire CR built?

It was built in 1960, making it 65 years old in 2025. It was reconstructed in 1981.

What condition is Is 270 E over Cowmire CR 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 November 2023.

How much traffic does Is 270 E over Cowmire CR carry?

About 105,806 vehicles per day (2024 count), of which roughly 18% are trucks.

How long is Is 270 E over Cowmire CR?

The structure is 38 ft (11.6 m) long with a longest span of 12 ft (3.7 m).

Who owns Is 270 E over Cowmire CR?

It is owned by the State Highway Agency.