101 AND 280
101 AND 280 in 04-Sf-101-1.63-Sf, San Francisco County, California received a condition grade of C (59/100). Built in 1960, the bridge carries 154K vehicles daily on 101 AND 280 over 280/101 Interchange. It is classified as structurally deficient.
101 AND 280 carries a C on the BridgeSafety Condition Score with 59/100. Component ratings sit in the middle of the FHWA NBI distribution; rehabilitation programming is likely on the owning agency’s medium-term horizon.
The bridge was built in 1960 and is now 66 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. 101 AND 280 carries an average daily traffic count of 153,800 vehicles, with 4 lane(s) crossing 280/101 Interchange. 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
101 AND 280 is a 66-year-old bridge located 04-Sf-101-1.63-Sf in San Francisco County, California. The bridge carries 101 AND 280 over 280/101 Interchange with 4 traffic lanes, handling approximately 154K vehicles per day. Built in 1960, the structure spans 498 meters.
The bridge received a Condition Grade of C (59/100) based on Federal Highway Administration inspection data. Its deck is rated 4/9 (poor), superstructure 7/9 (good), 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
101 AND 280 has a Condition Score of 59/100 (Grade C). Its deck is rated 4/9, superstructure 7/9, and substructure 7/9 on the NBI scale. The bridge is classified as structurally deficient.
101 AND 280 was built in 1960, making it 66 years old. The average bridge age in the United States is 48 years.
101 AND 280 carries approximately 154K vehicles per day (average daily traffic). The bridge has 4 traffic lanes. It is 498 meters long and located on 101 AND 280 in 04-Sf-101-1.63-Sf, San Francisco County, California.
Yes, 101 AND 280 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.
101 AND 280 is located 04-Sf-101-1.63-Sf in San Francisco County, California. The bridge carries 101 AND 280 over 280/101 Interchange. Its coordinates are 37.730942, -122.403817. It is maintained by State Highway Agency.
101 AND 280 carries 101 AND 280 over 280/101 Interchange. The bridge is 498 meters long and was built in 1960.
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.