SR 21 over San Poil River
Ferry County, Washington · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- SR 21 over San Poil River in Ferry County, Washington, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
- It was built in 1987, making it 38 years old at the 2025 inventory.
- It carries about 1,580 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 23 of the 55 inventoried bridges in Ferry County rated good (41.8%); 6 (10.9%) 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 2023, on a 24-month routine inspection cycle.
- 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 → (48.67847, -118.66422)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Prestressed concrete channel beam |
| Length | about 46 ft |
| Location | 2.8 N Jct SR 20 |
| NBI structure number | 0013285A0000000 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | April 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 Washington department of transportation.
Busiest bridges in Ferry County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| SR 20 over Abandoned Railroad | 1960 | 2,660 | Poor |
| Bridge Creek Road over Cornstalk Creek | 2000 | 1,493 | Good |
| Boulder Creek Road over Curlew Creek | 2000 | 1,390 | Good |
| SR 21 over Curlew Creek | 2012 | 1,146 | Good |
| W Curlew Lake Rd over Curlew Creek | 2024 | 1,074 | Good |
| US 395 over RR | 1941 | 1,051 | Good |
All bridges nearby: Ferry County, WA bridge conditions · every bridge in Ferry County · Washington bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.