Quincy-la Porte Rd over Middle Fork Feather Riv
Plumas County, California · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Quincy-la Porte Rd over Middle Fork Feather Riv in Plumas County, California, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1975, making it 50 years old at the 2025 inventory.
- It carries about 180 vehicles a day (traffic count year 2019).
- Its listed owner is the county highway agency.
- It is one of 117 of the 165 inventoried bridges in Plumas County rated fair (70.9%); 5 (3.0%) 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 October 2023, on a 24-month routine inspection cycle.
- A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.
View this bridge on a map → (39.85924, -120.84982)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 5 | 5 | Fair condition |
Bridge details
| Structure | Continuous prestressed concrete multiple box beam |
| Length | about 269 ft |
| Location | 7.9 Mi S/W SH 70 |
| NBI structure number | 09C0004 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | October 2023 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 5: foundations stable, scour within the limits of the footing or piles |
Source: FHWA National Bridge Inventory, 2025 data as reported by the California department of transportation.
Busiest bridges in Plumas County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Gulling Street over UP RR & BNSF Ry | 1954 | 10,046 | Fair |
| Gulling Street over Middle Fork Feather Riv | 1954 | 10,046 | Poor |
| State Route 70 over Spanish Creek | 1964 | 6,700 | Fair |
| State Route 70 over Clear Stream | 1937 | 6,700 | Good |
| State Route 70 over Humbug Creek | 1969 | 6,200 | Good |
| State Route 36 over North Fork Feather River | 1966 | 5,500 | Fair |
All bridges nearby: Plumas County, CA bridge conditions · every bridge in Plumas County · California bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.