I 280 N AL LINE
I 280 N AL LINE in 04-Sf-280-R4.16r-Sf, San Francisco County, California received a condition grade of C (55/100). Built in 1960, the bridge carries 170K vehicles daily on I 280 N AL LINE over 280/101 Interchange. It is classified as structurally deficient.
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 280 N AL LINE is a 66-year-old bridge located 04-Sf-280-R4.16r-Sf in San Francisco County, California. The bridge carries I 280 N AL LINE over 280/101 Interchange with 2 traffic lanes, handling approximately 170K vehicles per day. Built in 1960 and reconstructed in 1996, the structure spans 347.5 meters.
The bridge received a Condition Grade of C (55/100) based on Federal Highway Administration inspection data. Its deck is rated 4/9 (poor), superstructure 6/9 (fair), and substructure 7/9 (good). The bridge is classified as structurally deficient, meaning at least one major component is rated 4 or below — this signals a need for repair or replacement but does not necessarily indicate an immediate safety hazard.
This bridge is owned and maintained by State Highway Agency.
Location Map
Frequently Asked Questions
I 280 N AL LINE has a Condition Score of 55/100 (Grade C). Its deck is rated 4/9, superstructure 6/9, and substructure 7/9 on the NBI scale. The bridge is classified as structurally deficient.
I 280 N AL LINE was built in 1960 and reconstructed in 1996, making it 66 years old. The average bridge age in the United States is 48 years.
I 280 N AL LINE carries approximately 170K vehicles per day (average daily traffic). The bridge has 2 traffic lanes. It is 347.5 meters long and located on I 280 N AL LINE in 04-Sf-280-R4.16r-Sf, San Francisco County, California.
Yes, I 280 N AL LINE is classified as structurally deficient because at least one of its primary components (deck, superstructure, or substructure) is rated 4 or below on the 0-9 NBI scale. This does not necessarily mean it is unsafe, but it requires significant repair or replacement.
I 280 N AL LINE is located 04-Sf-280-R4.16r-Sf in San Francisco County, California. The bridge carries I 280 N AL LINE over 280/101 Interchange. Its coordinates are 37.734122, -122.409661. It is maintained by State Highway Agency.
I 280 N AL LINE carries I 280 N AL LINE over 280/101 Interchange. The bridge is 347.5 meters long and was built in 1960, with reconstruction in 1996.
Condition Score is calculated from deck (33%), superstructure (33%), and substructure (34%) NBI ratings with an age penalty for bridges over 50 years.