Spillway Bridge over Spillway Channel
Garfield County, Washington · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Spillway Bridge over Spillway Channel in Garfield 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 1968, making it 57 years old at the 2025 inventory.
- It carries about 150 vehicles a day (traffic count year 2020).
- It is one of 27 of the 54 inventoried bridges in Garfield County rated good (50.0%); 4 (7.4%) 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 → (46.65945, -117.42935)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 7 | Good condition |
| Superstructure | 7 | Good condition |
| Substructure | 7 | Good condition |
Bridge details
| Structure | Prestressed concrete multiple box beam |
| Length | about 511 ft |
| Location | Lower Granite Dam |
| NBI structure number | CEPNPWWA0LGRSPY |
| Condition class | Good |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Washington department of transportation.
Busiest bridges in Garfield County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 12 over Stember CR | 1964 | 2,936 | Good |
| US 12 over Pataha CR | 1920 | 1,889 | Poor |
| SR 127 over Deadman Creek | 1969 | 929 | Good |
| SR 127 over Snake R Central Ferry | 1969 | 868 | Fair |
| Fairgrounds Rd over Pataha Creek | 1959 | 800 | Fair |
| 15TH Street over Pataha CR | 1925 | 680 | Fair |
All bridges nearby: Garfield County, WA bridge conditions · every bridge in Garfield County · Washington bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.