US Bridges

Mo 370 W over Mo 94

Fair

St. Charles County, Missouri · S 161 T 47 N R 5 E · Structure no. 4113

Built
1991
34 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
505 ft
5 main spans
Daily traffic
23,934
2024 count
Owner
State
State Highway Agency

About this bridge

Mo 370 W over Mo 94 is a steel continuous stringer/multi-beam or girder carrying Mo 370 W over Mo 94 in St. Charles County, Missouri. It was built in 1991, so it is 34 years old, younger 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 23,934 vehicles a day, roughly 5% of them trucks, projected to reach 40,688 by 2044. The structure is 505 ft (153.9 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 370 W
CrossesMo 94
LocationS 161 T 47 N R 5 E
RouteState Highway 370
CountySt. Charles County
StateMissouri
Coordinates38.80334, -90.4753
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
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 geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67.5 US tons
Inventory rating39.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20 + Mod
Structure length505 ft (153.9 m)
Longest span119 ft (36.3 m)
Deck width68 ft (20.6 m)
Roadway width65 ft (19.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic23,934 (2024)
Projected traffic40,688 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 370 W over Mo 94 built?

It was built in 1991, making it 34 years old in 2025.

What condition is Mo 370 W over Mo 94 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 Mo 370 W over Mo 94 carry?

About 23,934 vehicles per day (2024 count), of which roughly 5% are trucks.

How long is Mo 370 W over Mo 94?

The structure is 505 ft (153.9 m) long with a longest span of 119 ft (36.3 m) and a deck 68 ft wide.

Who owns Mo 370 W over Mo 94?

It is owned by the State Highway Agency.