US Bridges

Is 70 W over Cst S 5th ST

Fair

St. Charles County, Missouri · S 3280 T 46 N R 5 E · Structure no. 2999

Built
1977
48 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
164 ft
4 main spans
Daily traffic
84,031
2024 count
Owner
State
State Highway Agency

About this bridge

Is 70 W over Cst S 5th ST is a steel continuous stringer/multi-beam or girder carrying Is 70 W over Cst S 5th ST in St. Charles County, Missouri. It was built in 1977, so it is 48 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 84,031 vehicles a day, roughly 12% of them trucks, projected to reach 142,853 by 2044. The structure is 164 ft (50 m) long and 79 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesIs 70 W
CrossesCst S 5th ST
LocationS 3280 T 46 N R 5 E
RouteInterstate 70
CountySt. Charles County
StateMissouri
Coordinates38.76879, -90.49435
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating64.5 US tons
Inventory rating38.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length164 ft (50 m)
Longest span55 ft (16.8 m)
Deck width79 ft (24 m)
Roadway width76 ft (23.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic84,031 (2024)
Projected traffic142,853 by 2044
Trucks12%
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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Is 70 W over Cst S 5th ST built?

It was built in 1977, making it 48 years old in 2025.

What condition is Is 70 W over Cst S 5th ST 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 October 2023.

How much traffic does Is 70 W over Cst S 5th ST carry?

About 84,031 vehicles per day (2024 count), of which roughly 12% are trucks.

How long is Is 70 W over Cst S 5th ST?

The structure is 164 ft (50 m) long with a longest span of 55 ft (16.8 m) and a deck 79 ft wide.

Who owns Is 70 W over Cst S 5th ST?

It is owned by the State Highway Agency.