Is 55 N over Mo Pac RR
PoorClosed to trafficSt. Louis city, Missouri · S 17 T 44 N R 7 E · Structure no. 867
- Built
- 1963
- 62 years old, rebuilt 2020
- Condition
- Poor
- inspected November 2021
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 671 ft
- 8 main spans
- Daily traffic
- 44,800
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
Is 55 N over Mo Pac RR is a steel continuous stringer/multi-beam or girder carrying Is 55 N over Mo Pac RR in St. Louis city, Missouri. It was built in 1963 and reconstructed in 2020, so it is 62 years old, older 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 2 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. Its operating status is: closed to all traffic.
It carries about 44,800 vehicles a day, roughly 12% of them trucks, projected to reach 56,000 by 2044. The structure is 671 ft (204.5 m) long and 73 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 2 Critical | Advanced deterioration of primary structural elements. Bridge may be closed until corrective action is taken. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Is 55 N over Mo Pac RR built?
It was built in 1963, making it 62 years old in 2025. It was reconstructed in 2020.
What condition is Is 55 N over Mo Pac RR 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 November 2021.
How much traffic does Is 55 N over Mo Pac RR carry?
About 44,800 vehicles per day (2024 count), of which roughly 12% are trucks.
How long is Is 55 N over Mo Pac RR?
The structure is 671 ft (204.5 m) long with a longest span of 92 ft (28 m) and a deck 73 ft wide.
Who owns Is 55 N over Mo Pac RR?
It is owned by the State Highway Agency.