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SR 122 over Tilton River

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

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

SR 122 over Tilton River in Lewis 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 7 (good condition) on the 0-9 scale.
It was built in 1961, making it 64 years old at the 2025 inventory.
It carries about 757 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 209 of the 420 inventoried bridges in Lewis County rated good (49.8%); 17 (4.0%) 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	Continuous steel stringer or multi-beam girder
Length	about 1,113 ft
Location	3.6 E Jct US 12
NBI structure number	080050000000000
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
I-5 over Salzer Creek	1951	38,131	Fair
I-5 over Cw Ry	1953	36,296	Fair
I-5 over Np Ry & Dillenbaugh CR	1954	36,296	Fair
I-5 over RR & Reynolds Rd.	2013	34,754	Good
I-5 over Blakeslee Jct RR	2015	34,754	Good
I-5 over Dillenbaugh Creek	1952	32,739	Good