I-5 (HWY 001)
I-5 (HWY 001) in At Tualatin River, Washington County, Oregon received a condition grade of B (70/100). Built in 1975, the bridge carries 156K vehicles daily on I-5 (HWY 001) over Tualatin River.
I-5 (HWY 001) carries a B on the BridgeSafety Condition Score with 70/100. Most component ratings are solid; one or two may show wear consistent with the structure’s age, but the bridge is not flagged as structurally deficient.
The bridge was built in 1975 and is now 51 years old, at or past the typical 50-year design life for bridges of its vintage. Maintenance and inspection cycles are correspondingly more involved than for newer structures. I-5 (HWY 001) carries an average daily traffic count of 156,016 vehicles, with 8 lane(s) crossing Tualatin River. The owning agency is State Highway Agency; bridge inspection records flow into the federal NBI database annually.
Component Ratings
The riding surface, evaluated for cracking, spalling, and wear
Beams, girders, and trusses that support the deck
Piers, abutments, and foundations below the deck
Bridge Details
About This Bridge
I-5 (HWY 001) is a 51-year-old bridge located At Tualatin River in Washington County, Oregon. The bridge carries I-5 (HWY 001) over Tualatin River with 8 traffic lanes, handling approximately 156K vehicles per day. Built in 1975 and reconstructed in 1991, the structure spans 79.2 meters.
The bridge received a Condition Grade of B (70/100) based on Federal Highway Administration inspection data. Its deck is rated 7/9 (good), superstructure 6/9 (fair), and substructure 6/9 (fair).
This bridge is owned and maintained by State Highway Agency.
Location Map
Frequently Asked Questions
I-5 (HWY 001) has a Condition Score of 70/100 (Grade B). Its deck is rated 7/9, superstructure 6/9, and substructure 6/9 on the NBI scale. The bridge is not classified as structurally deficient.
I-5 (HWY 001) was built in 1975 and reconstructed in 1991, making it 51 years old. The average bridge age in the United States is 48 years.
I-5 (HWY 001) carries approximately 156K vehicles per day (average daily traffic). The bridge has 8 traffic lanes. It is 79.2 meters long and located on I-5 (HWY 001) in At Tualatin River, Washington County, Oregon.
No, I-5 (HWY 001) is not classified as structurally deficient. All three primary components (deck, superstructure, and substructure) are rated above 4 on the 0-9 NBI scale.
I-5 (HWY 001) is located At Tualatin River in Washington County, Oregon. The bridge carries I-5 (HWY 001) over Tualatin River. Its coordinates are 45.387594, -122.750661. It is maintained by State Highway Agency.
I-5 (HWY 001) carries I-5 (HWY 001) over Tualatin River. The bridge is 79.2 meters long and was built in 1975, with reconstruction in 1991.
Condition Score is calculated from deck (33%), superstructure (33%), and substructure (34%) NBI ratings with an age penalty for bridges over 50 years.
Source: FHWA National Bridge Inventory, 2026.