US Bridges

Mo 370 W over NS RR

Fair

St. Louis County, Missouri · S 2039 T 47 N R 5 E · Structure no. 11905

Built
1990
35 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
252 ft
3 main spans
Daily traffic
15,375
2024 count
Owner
State
State Highway Agency

About this bridge

Mo 370 W over NS RR is a steel continuous stringer/multi-beam or girder carrying Mo 370 W over NS RR in St. Louis County, Missouri. It was built in 1990, so it is 35 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 6 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 15,375 vehicles a day, roughly 22% of them trucks, projected to reach 19,219 by 2044. The structure is 252 ft (76.8 m) long and 41 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesMo 370 W
CrossesNS RR
LocationS 2039 T 47 N R 5 E
RouteState Highway 370
CountySt. Louis County
StateMissouri
Coordinates38.77215, -90.40401
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating87.3 US tons
Inventory rating52.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length252 ft (76.8 m)
Longest span98 ft (29.9 m)
Deck width41 ft (12.6 m)
Roadway width39 ft (11.8 m)
Vertical clearance over deck17 ft (5.1 m)

Traffic and service

Average daily traffic15,375 (2024)
Projected traffic19,219 by 2044
Trucks22%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
Detour if closed5 mi (8 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 1990, making it 35 years old in 2025.

What condition is Mo 370 W over NS RR 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 August 2024.

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

About 15,375 vehicles per day (2024 count), of which roughly 22% are trucks.

How long is Mo 370 W over NS RR?

The structure is 252 ft (76.8 m) long with a longest span of 98 ft (29.9 m) and a deck 41 ft wide.

Who owns Mo 370 W over NS RR?

It is owned by the State Highway Agency.