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Irr Bia Rte 18 over Trib to Quinault River

Grays Harbor County, Washington · rated Good in the 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

Irr Bia Rte 18 over Trib to Quinault River in Grays Harbor County, Washington, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 8 (very good condition) on the 0-9 scale.
It was built in 2019, making it 6 years old at the 2025 inventory.
It carries about 2,021 vehicles a day.
It is one of 188 of the 371 inventoried bridges in Grays Harbor County rated good (50.7%); 31 (8.4%) 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.

Component ratings


Structure	Steel stringer or multi-beam girder
Length	about 104 ft
Location	3 Km S of Amanda Pk Junct
NBI structure number	0000P06117B1804
Condition class	Good

Source: FHWA National Bridge Inventory, 2025 data as reported by the Washington department of transportation.

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