Irr Bia Rte 13 over St Mary Canal
Glacier County, Montana · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Irr Bia Rte 13 over St Mary Canal in Glacier County, Montana, 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 2002, making it 23 years old at the 2025 inventory.
- It carries about 10 vehicles a day (traffic count year 2023).
- It is one of 28 of the 71 inventoried bridges in Glacier County rated good (39.4%); 3 (4.2%) 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 → (48.99065, -113.09483)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 7 | Good condition |
| Superstructure | 7 | Good condition |
| Substructure | 7 | Good condition |
Bridge details
| Structure | Prestressed concrete tee beam |
| Length | about 83 ft |
| Location | 32 Km NE of Babb |
| NBI structure number | 00000000000C142 |
| Condition class | Good |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Montana department of transportation.
Busiest bridges in Glacier County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Irr - US 2 over RR | 1997 | 3,716 | Good |
| Irr - US 2 over Cut Bank Creek | 2007 | 3,523 | Fair |
| Irr - US 2 over RR | 1997 | 2,515 | Good |
| Irr - US 89 over St Marys River | 1956 | 2,355 | Fair |
| Going-to-the-sun R over St. Mary River | 1934 | 2,300 | Fair |
| Going-to-the-sun R over Divide Creek | 1934 | 2,300 | Fair |
All bridges nearby: Glacier County, MT bridge conditions · every bridge in Glacier County · Montana bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.