US Bridges

Is 70 E over Belleau CR

Fair

St. Charles County, Missouri · S 27 T 47 N R 3 E · Structure no. 6450

Built
1955
70 years old, rebuilt 2012
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
102 ft
3 main spans
Daily traffic
108,528
2024 count
Owner
State
State Highway Agency

About this bridge

Is 70 E over Belleau CR is a steel stringer/multi-beam or girder carrying Is 70 E over Belleau CR in St. Charles County, Missouri. It was built in 1955 and reconstructed in 2012, so it is 70 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 108,528 vehicles a day, roughly 12% of them trucks, projected to reach 184,498 by 2044. The structure is 102 ft (31.1 m) long and 122 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesIs 70 E
CrossesBelleau CR
LocationS 27 T 47 N R 3 E
RouteInterstate 70
CountySt. Charles County
StateMissouri
Coordinates38.80312, -90.67737
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 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
Deck geometry9: Superior to present desirable criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating96.2 US tons
Inventory rating57.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length102 ft (31.1 m)
Longest span50 ft (15.3 m)
Deck width122 ft (37.2 m)
Roadway width119 ft (36.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic108,528 (2024)
Projected traffic184,498 by 2044
Trucks12%
Lanes on structure7
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 70 E over Belleau CR built?

It was built in 1955, making it 70 years old in 2025. It was reconstructed in 2012.

What condition is Is 70 E over Belleau 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 September 2023.

How much traffic does Is 70 E over Belleau CR carry?

About 108,528 vehicles per day (2024 count), of which roughly 12% are trucks.

How long is Is 70 E over Belleau CR?

The structure is 102 ft (31.1 m) long with a longest span of 50 ft (15.3 m) and a deck 122 ft wide.

Who owns Is 70 E over Belleau CR?

It is owned by the State Highway Agency.