Is 55 S over Is 44 Rp IS44E to Mem
St. Louis city, Missouri · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Is 55 S over Is 44 Rp IS44E to Mem in St. Louis city, Missouri, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
- It was built in 2015, making it 10 years old at the 2025 inventory.
- It carries about 32,335 vehicles a day (traffic count year 2024).
- Its listed owner is the state highway agency.
- It is one of 78 of the 239 inventoried bridges in St. Louis city rated good (32.6%); 22 (9.2%) are rated poor.
- A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.
View this bridge on a map → (38.61991, -90.18871)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 7 | Good condition |
| Superstructure | 7 | Good condition |
| Substructure | 8 | Very good condition |
Bridge details
| Structure | Continuous prestressed concrete tee beam |
| Length | about 895 ft |
| Location | S 23 T 45 N R 7 E |
| NBI structure number | 34664 |
| Condition class | Good |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Missouri department of transportation.
Busiest bridges in St. Louis city
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Is 64 E over Cst Mccausland Ave | 2008 | 159,584 | Good |
| Is 70 E over Mo 367 | 1999 | 137,346 | Fair |
| Is 55 S over Cst S Lenore K Sulliva | 1963 | 120,209 | Fair |
| Is 70 E over Cst Branch St | 1999 | 113,474 | Fair |
| Is 70 E over Cst Angelica St | 1999 | 100,176 | Fair |
| Is 70 E over St Louis Terminal | 1999 | 95,646 | Fair |
All bridges nearby: St. Louis city, MO bridge conditions · every bridge in St. Louis city · Missouri bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.