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I-5 (hwy 001) Con over Beaver Dam Creek

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

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

I-5 (hwy 001) Con over Beaver Dam Creek in Washington County, Oregon, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1991, making it 34 years old at the 2025 inventory.
It carries about 10,792 vehicles a day (traffic count year 2022).
Its listed owner is the state highway agency.
It is one of 227 of the 334 inventoried bridges in Washington County rated fair (68.0%); 11 (3.3%) 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	Prestressed concrete stringer or multi-beam girder
Length	about 1,131 ft
Location	0.4 Mi S of Tualatin R.
NBI structure number	16955 001C28940
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
I-5 (hwy 001) over Lower Boonesferry	1975	156,558	Fair
I-5 (hwy 001) over Tualatin River	1975	156,016	Fair
I-5 (hwy 001) over P&w RR	1975	154,838	Fair
US 26 (hwy 047) EB over Cedar Hills Blvd	1966	144,211	Fair
US 26 (hwy 047) over Hwy 144	1986	133,089	Fair
US 26 (Hwy 047) over Light Rail Transit	1996	133,089	Fair