N-n Ramp over I-5
Pierce County, Washington · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- N-n Ramp over I-5 in Pierce County, Washington, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 8 (very good condition) on the 0-9 scale.
- It was built in 2011, making it 14 years old at the 2025 inventory.
- It carries about 46,602 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 267 of the 480 inventoried bridges in Pierce County rated good (55.6%); 22 (4.6%) 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 → (47.2285, -122.46111)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 8 | Very good condition |
| Superstructure | 8 | Very good condition |
| Substructure | 8 | Very good condition |
Bridge details
| Structure | Prestressed concrete segmental box girder |
| Length | about 1,061 ft |
| Location | Jct SR 16 |
| NBI structure number | 0017594A0000000 |
| Condition class | Good |
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.