I-5
I-5 in 4.5 N JCT SR 900, King County, Washington received a condition grade of B (65/100). Built in 1966, the bridge carries 122K vehicles daily on I-5 over Terrain.
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 is a 60-year-old bridge located 4.5 N JCT SR 900 in King County, Washington. The bridge carries I-5 over Terrain with 5 traffic lanes, handling approximately 122K vehicles per day. Built in 1966 and reconstructed in 1992, the structure spans 184.1 meters.
The bridge received a Condition Grade of B (65/100) based on Federal Highway Administration inspection data. Its deck is rated 6/9 (fair), superstructure 6/9 (fair), and substructure 7/9 (good).
This bridge is owned and maintained by State Highway Agency.
Location Map
Frequently Asked Questions
I-5 has a Condition Score of 65/100 (Grade B). Its deck is rated 6/9, superstructure 6/9, and substructure 7/9 on the NBI scale. The bridge is not classified as structurally deficient.
I-5 was built in 1966 and reconstructed in 1992, making it 60 years old. The average bridge age in the United States is 48 years.
I-5 carries approximately 122K vehicles per day (average daily traffic). The bridge has 5 traffic lanes. It is 184.1 meters long and located on I-5 in 4.5 N JCT SR 900, King County, Washington.
No, I-5 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 is located 4.5 N JCT SR 900 in King County, Washington. The bridge carries I-5 over Terrain. Its coordinates are 47.561361, -122.322056. It is maintained by State Highway Agency.
I-5 carries I-5 over Terrain. The bridge is 184.1 meters long and was built in 1966, with reconstruction in 1992.
Condition Score is calculated from deck (33%), superstructure (33%), and substructure (34%) NBI ratings with an age penalty for bridges over 50 years.