E. Sublette Road over Portneuf Marsh Val.cnl
Bannock County, Idaho · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- E. Sublette Road over Portneuf Marsh Val.cnl in Bannock County, Idaho, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 4 (poor condition) on the 0-9 scale.
- It was built in 1968, making it 57 years old at the 2025 inventory.
- It carries about 50 vehicles a day (traffic count year 2023).
- Its listed owner is the county highway agency.
- It is one of 6 of the 128 inventoried bridges in Bannock County rated poor (4.7%); 6 (4.7%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated April 2024, on a 12-month routine inspection cycle.
- A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.
View this bridge on a map → (42.57856, -112.16139)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 4 | 4 | Poor condition |
| Superstructure | 4 | 4 | Poor condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Prestressed concrete tee beam |
| Length | about 26 ft |
| Location | 1.2 N. 0.5 E. Arimo |
| NBI structure number | 000000000022025 |
| Condition class | Poor |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | April 2024 |
| Inspection interval (item 91) | 12 months |
| Scour (item 113) | 8: foundations stable, scour above the top of the footing |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Idaho department of transportation.
Busiest bridges in Bannock County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 91 ;quinn Rd. over Uprr;quinn Road Op | 1986 | 22,500 | Good |
| I 15 Sbl over I 86 WB Ramp | 2024 | 19,250 | Good |
| I 15 Nbl over I 86 WB Ramp | 2023 | 19,250 | Good |
| I 15 Sbl over I 86 EB Ramp | 2024 | 19,250 | Good |
| I 15 Sbl over STP7041;CHUBBUCK Road | 2024 | 19,250 | Good |
| I 15 Nbl over I 15B;POCATELLO Creek Ic | 1999 | 19,000 | Fair |
All bridges nearby: Bannock County, ID bridge conditions · every bridge in Bannock County · Idaho bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.