US Bridges

Mo 370 E over Is 270 Rp IS270E to MO3

Fair

St. Louis County, Missouri · S 2038 T 47 N R 5 E · Structure no. 3981

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

About this bridge

Mo 370 E over Is 270 Rp IS270E to MO3 is a steel continuous stringer/multi-beam or girder carrying Mo 370 E over Is 270 Rp IS270E to MO3 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 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 16,184 vehicles a day, roughly 18% of them trucks, projected to reach 20,230 by 2044. The structure is 557 ft (169.8 m) long and 53 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesMo 370 E
CrossesIs 270 Rp IS270E to MO3
LocationS 2038 T 47 N R 5 E
RouteState Highway 370
CountySt. Louis County
StateMissouri
Coordinates38.77009, -90.40702
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2024
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 rating74.4 US tons
Inventory rating44.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20 + Mod
Structure length557 ft (169.8 m)
Longest span111 ft (33.8 m)
Deck width53 ft (16.3 m)
Roadway width51 ft (15.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16,184 (2024)
Projected traffic20,230 by 2044
Trucks18%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed9.9 mi (16 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$4.7 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Mo 370 E over Is 270 Rp IS270E to MO3 built?

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

What condition is Mo 370 E over Is 270 Rp IS270E to MO3 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 Is 270 Rp IS270E to MO3 carry?

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

How long is Mo 370 E over Is 270 Rp IS270E to MO3?

The structure is 557 ft (169.8 m) long with a longest span of 111 ft (33.8 m) and a deck 53 ft wide.

Who owns Mo 370 E over Is 270 Rp IS270E to MO3?

It is owned by the State Highway Agency.