US Bridges

Mo 370 W over NS RR

Good

St. Charles County, Missouri · S 29 T 47 N R 4 E · Structure no. 4107

Built
1994
31 years old
Condition
Good
inspected October 2023
Type
Tee Beam
Prestressed Concrete Continuous
Length
289 ft
3 main spans
Daily traffic
15,378
2024 count
Owner
State
State Highway Agency

About this bridge

Mo 370 W over NS RR is a prestressed concrete continuous tee beam carrying Mo 370 W over NS RR in St. Charles County, Missouri. It was built in 1994, so it is 31 years old, younger than the Missouri average of 45.1 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 15,378 vehicles a day, roughly 5% of them trucks, projected to reach 26,143 by 2044. The structure is 289 ft (88.1 m) long and 58 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesMo 370 W
CrossesNS RR
LocationS 29 T 47 N R 4 E
RouteState Highway 370
Coordinates38.80331, -90.58997
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating83.3 US tons
Inventory rating49.6 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length289 ft (88.1 m)
Longest span112 ft (34.1 m)
Deck width58 ft (17.6 m)
Roadway width55 ft (16.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,378 (2024)
Projected traffic26,143 by 2044
Trucks5%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
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 NS RR built?

It was built in 1994, making it 31 years old in 2025.

What condition is Mo 370 W over NS RR in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2023.

How much traffic does Mo 370 W over NS RR carry?

About 15,378 vehicles per day (2024 count), of which roughly 5% are trucks.

How long is Mo 370 W over NS RR?

The structure is 289 ft (88.1 m) long with a longest span of 112 ft (34.1 m) and a deck 58 ft wide.

Who owns Mo 370 W over NS RR?

It is owned by the State Highway Agency.