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Louisiana St over Lake Sacajawea

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

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

Louisiana St over Lake Sacajawea in Cowlitz 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 1967, making it 58 years old at the 2025 inventory.
It carries about 8,100 vehicles a day (traffic count year 2021).
Its listed owner is a city or municipal highway agency.
It is one of 75 of the 161 inventoried bridges in Cowlitz County rated good (46.6%); 6 (3.7%) 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	Prestressed concrete stringer or multi-beam girder
Length	about 80 ft
Location	Louisiana St. & Lake Sac.
NBI structure number	085506000000000
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 Bn Ry	1972	37,599	Fair
I-5 over Kalama River	1971	37,279	Good
I-5 over Kalama River	1970	37,279	Good
I-5 over Owl Creek	1972	36,932	Good
I-5 over Owl Creek	1972	36,932	Good
I-5 over Todd Rd	1971	35,483	Good