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Jackson Hwy. over Newaukum Overflow

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

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

Jackson Hwy. over Newaukum Overflow in Lewis County, Washington, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the superstructure, rated 5 (fair condition) on the 0-9 scale.
It was built in 1926 and reconstructed in 1978, making it 99 years old at the 2025 inventory.
It carries about 3,427 vehicles a day (traffic count year 2019).
Its listed owner is the county highway agency.
It is one of 194 of the 420 inventoried bridges in Lewis County rated fair (46.2%); 17 (4.0%) are rated poor.
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.

Component ratings


Structure	Continuous concrete tee beam
Length	about 55 ft
Location	2.45 N Jct SR 508
NBI structure number	083260000000000
Condition class	Fair

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