Mo 340 W over Cst Chesterfield Pkwy
PoorSt. Louis County, Missouri · S 2002 T 45 N R 4 E · Structure no. 3815
- Built
- 1990
- 35 years old
- Condition
- Poor
- inspected July 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete Continuous
- Length
- 173 ft
- 3 main spans
- Daily traffic
- 22,693
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
Mo 340 W over Cst Chesterfield Pkwy is a prestressed concrete continuous stringer/multi-beam or girder carrying Mo 340 W over Cst Chesterfield Pkwy 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
It carries about 22,693 vehicles a day, roughly 3% of them trucks, projected to reach 31,770 by 2044. The structure is 173 ft (52.7 m) long and 50 ft wide. If it were closed, the detour would be 0.6 mi (1 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Mo 340 W over Cst Chesterfield Pkwy built?
It was built in 1990, making it 35 years old in 2025.
What condition is Mo 340 W over Cst Chesterfield Pkwy in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in July 2024.
How much traffic does Mo 340 W over Cst Chesterfield Pkwy carry?
About 22,693 vehicles per day (2024 count), of which roughly 3% are trucks.
How long is Mo 340 W over Cst Chesterfield Pkwy?
The structure is 173 ft (52.7 m) long with a longest span of 90 ft (27.4 m) and a deck 50 ft wide.
Who owns Mo 340 W over Cst Chesterfield Pkwy?
It is owned by the State Highway Agency.