US Bridges

Mo 370 E over NS RR

Fair

St. Louis County, Missouri · S 36 T 47 N R 5 E · Structure no. 3991

Built
1991
34 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
169 ft
3 main spans
Daily traffic
16,184
2024 count
Owner
State
State Highway Agency

About this bridge

Mo 370 E over NS RR is a prestressed concrete continuous stringer/multi-beam or girder carrying Mo 370 E over NS RR in St. Louis 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 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 16,184 vehicles a day, roughly 18% of them trucks, projected to reach 20,230 by 2044. The structure is 169 ft (51.5 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 E
CrossesNS RR
LocationS 36 T 47 N R 5 E
RouteState Highway 370
CountySt. Louis County
StateMissouri
Coordinates38.77111, -90.40261
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionAugust 2024
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 rating90.3 US tons
Inventory rating51.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length169 ft (51.5 m)
Longest span56 ft (17.2 m)
Deck width41 ft (12.6 m)
Roadway width39 ft (11.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16,184 (2024)
Projected traffic20,230 by 2044
Trucks18%
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 E over NS RR built?

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

What condition is Mo 370 E 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 E over NS RR carry?

About 16,184 vehicles per day (2024 count), of which roughly 18% are trucks.

How long is Mo 370 E over NS RR?

The structure is 169 ft (51.5 m) long with a longest span of 56 ft (17.2 m) and a deck 41 ft wide.

Who owns Mo 370 E over NS RR?

It is owned by the State Highway Agency.