Middle Fork Road over M.fk.weiser River
Adams County, Idaho · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Middle Fork Road over M.fk.weiser River in Adams County, Idaho, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 3 (serious condition) on the 0-9 scale.
- It was built in 1957, making it 68 years old at the 2025 inventory.
- It carries about 70 vehicles a day (traffic count year 2023).
- Its listed owner is the county highway agency.
- It is one of 8 of the 87 inventoried bridges in Adams County rated poor (9.2%); 8 (9.2%) are rated poor.
- Its traffic status in the 2025 inventory is posted for load (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated August 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 → (44.68322, -116.22811)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 6 | 6 | Satisfactory condition |
| Substructure | 3 | 3 | Serious condition |
Bridge details
| Structure | Timber stringer or multi-beam girder |
| Length | about 32 ft |
| Location | 7.3 W 3.4 S Donnelly |
| NBI structure number | 000000000026533 |
| Condition class | Poor |
| Traffic status (item 41) | Posted for load |
| Last inspection (item 90) | August 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 Adams County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 95 over Little Salmon River | 2021 | 3,300 | Good |
| US 95 over W.fk.goose Creek | 1978 | 3,300 | Fair |
| US 95 over E.fk.goose Creek | 1978 | 3,300 | Fair |
| US 95 over Little Salmon River | 2019 | 3,100 | Good |
| US 95 over M.fk.weiser River | 1974 | 2,900 | Fair |
| US 95 over Cottonwood Creek | 2017 | 2,900 | Good |
All bridges nearby: Adams County, ID bridge conditions · every bridge in Adams County · Idaho bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.