US Bridges

Salt River RD E over Mo 370

Fair

St. Charles County, Missouri · S 1786 T 47 N R 4 E · Structure no. 4209

Built
1995
30 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
455 ft
4 main spans
Daily traffic
2,814
2024 count
Owner
State
State Highway Agency

About this bridge

Salt River RD E over Mo 370 is a steel continuous stringer/multi-beam or girder carrying Salt River RD E over Mo 370 in St. Charles County, Missouri. It was built in 1995, so it is 30 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 2,814 vehicles a day, roughly 18% of them trucks, projected to reach 5,065 by 2044. The structure is 455 ft (138.7 m) long and 30 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSalt River RD E
CrossesMo 370
LocationS 1786 T 47 N R 4 E
RouteCity Street 0
CountySt. Charles County
StateMissouri
Coordinates38.81144, -90.58589
Functional classUrban Minor Arterial

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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment8: Equal to present desirable criteria
Operating rating91.3 US tons
Inventory rating55.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length455 ft (138.7 m)
Longest span145 ft (44.2 m)
Deck width30 ft (9 m)
Roadway width27 ft (8.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,814 (2024)
Projected traffic5,065 by 2044
Trucks18%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

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 Salt River RD E over Mo 370 built?

It was built in 1995, making it 30 years old in 2025.

What condition is Salt River RD E over Mo 370 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 Salt River RD E over Mo 370 carry?

About 2,814 vehicles per day (2024 count), of which roughly 18% are trucks.

How long is Salt River RD E over Mo 370?

The structure is 455 ft (138.7 m) long with a longest span of 145 ft (44.2 m) and a deck 30 ft wide.

Who owns Salt River RD E over Mo 370?

It is owned by the State Highway Agency.