South Bank Road over Chehalis R Overflow
Grays Harbor County, Washington · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- South Bank Road over Chehalis R Overflow in Grays Harbor County, Washington, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1965 and reconstructed in 1977, making it 60 years old at the 2025 inventory.
- It carries about 2,917 vehicles a day (traffic count year 2020).
- Its listed owner is the county highway agency.
- It is one of 152 of the 371 inventoried bridges in Grays Harbor County rated fair (41.0%); 31 (8.4%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its class is unchanged from 2024 (fair), but component ratings moved: substructure 6 to 7.
- Its most recent inspection on record is dated November 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 → (46.98833, -123.40889)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 5 | 5 | Fair condition |
| Superstructure | 5 | 5 | Fair condition |
| Substructure | 6 | 7 | Good condition |
Bridge details
| Structure | Continuous concrete slab |
| Length | about 81 ft |
| Location | 1.0 S Jct SR 12 |
| NBI structure number | 079940000000000 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | November 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | U: unknown foundation, not evaluated for scour |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Washington department of transportation.
Busiest bridges in Grays Harbor County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 101 over Chehalis River | 1955 | 26,216 | Poor |
| US 12 over Camp Creek | 2024 | 23,177 | Good |
| US 12 over Wynoochee River | 1935 | 21,466 | Poor |
| US 12 over Unnamed Tributary | 2018 | 21,466 | Good |
| US 12 over Wishkah River | 1925 | 16,009 | Poor |
| US 12 / Heron St over Wishkah River | 1949 | 14,965 | Poor |
All bridges nearby: Grays Harbor County, WA bridge conditions · every bridge in Grays Harbor County · Washington bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.