Orcas to Olga road over Cascade Creek
San Juan County, Washington · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Orcas to Olga road over Cascade Creek in San Juan County, Washington, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1921, making it 104 years old at the 2025 inventory.
- It carries about 1,607 vehicles a day (traffic count year 2024).
- Its listed owner is the county highway agency.
- It is one of 9 of the 13 inventoried bridges in San Juan County rated fair (69.2%); 0 (0.0%) 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 September 2024, 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 → (48.64506, -122.83638)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | – | 7 | Good condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Concrete deck arch |
| Length | about 27 ft |
| Location | Orcas Island |
| NBI structure number | 084419000000000 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | September 2024 |
| 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 San Juan County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| SR 20 Extension over Friday Hbr-san Juan Chan | 1968 | 2,587 | Fair |
| SR 20 Extension over Friday Hbr-san Juan Chan | 2005 | 2,587 | Good |
| SR 20 over Harney Channel | 1959 | 2,322 | Good |
| SR 20 over Harney Channel | 1979 | 2,150 | Fair |
| Deer Harbor Road over Crow Valley Drainage | 2001 | 1,826 | Fair |
| Extension of SR 20 over Upright Channel | 1981 | 1,349 | Fair |
All bridges nearby: San Juan County, WA bridge conditions · every bridge in San Juan County · Washington bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.