North Herron Rd NW over Herron Bay
Pierce County, Washington · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- North Herron Rd NW over Herron Bay in Pierce County, Washington, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1954, making it 71 years old at the 2025 inventory.
- It carries about 350 vehicles a day (traffic count year 2021).
- Its listed owner is the county highway agency.
- It is one of 191 of the 480 inventoried bridges in Pierce County rated fair (39.8%); 22 (4.6%) are rated poor.
- 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 → (47.27404, -122.81189)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 6 | Satisfactory condition |
| Superstructure | 6 | Satisfactory condition |
| Substructure | 6 | Satisfactory condition |
Bridge details
| Structure | Continuous concrete slab |
| Length | about 60 ft |
| Location | 3.2 W Jct Key Penninsula |
| NBI structure number | 083726000000000 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Washington department of transportation.
Busiest bridges in Pierce County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-5 over Portland Ave | 1962 | 105,864 | Fair |
| I-5 over Portland Ave | 1962 | 105,864 | Fair |
| I-5 over Wapato Creek | 1960 | 97,641 | Good |
| I-5 over Wapato Creek | 1960 | 97,641 | Good |
| I-5 over Hylebos Creek | 1960 | 96,536 | Good |
| I-5 over Hylebos Creek | 1960 | 96,536 | Good |
All bridges nearby: Pierce County, WA bridge conditions · every bridge in Pierce County · Washington bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.